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False positive blue dye pregnancy test?
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False positive blue dye pregnancy test?
A chemical pregnancy can still give a strong positive pregnancy test. Jul 24, 2023 · A blue strip means it’s more likely the membranes have ruptured. Even if you didn't follow your home pregnancy test instructions exactly, know this: A false positive is rare. Jun 29, 2023 · For dye-based pregnancy tests, results are interpreted by the number of colored lines that appear in the test window shortly after urinating on the test stick, says Dr A positive pregnancy test result should be pink (or blue) just like the control line. Feb 22, 2012 · False positive pregnancy test? dye smudge? 19 answers / Last post: 10/06/2019 at 3:22 am. Only a few things can cause people to have detectable levels of hCG not related to pregnancy: MORAL #1-Blue dye tests always suck. Have been NTNP for the past 6 months, but two days late as of yesterday (4/10 - although cycles have been very irregular in the past), and took a Walgreens brand blue dye test this morning at 6:15ish right when I woke up. This can create confusion and uncertainty about whether you are pregnant or not While faint positive results are generally indicative of pregnancy, there is a small chance of a false positive Has anybody had false positives or evap on Blue dye tests that have had colour to them? I read an article saying there is no way it is possible for colour to show on the test line without hcg being detected. Pink dye pregnancy tests are better than blue dye pregnancy tests. Looks positive to me! I saw a positive with a blue dye test before I saw one with FRER (which made me nervous because it was the Up&Up brand test, which has terribly reviews for giving false positives). another possibility is that you saw an evaporation line thinking it was positive. Evaporation lines may also be more prone to mimicking a true positive with blue dye. Google searches are really bumming me out. How many of you ladies have gotten a false positive on an equate brand early result test? I had a possible indent/vvfl on a FRER 48 hours ago. How to Get the Most Accurate Results? For the most accurate results, wait until you have missed a period before you test. Has anyone else used the equate (walmart) brand blue dye tests? My periods are irregular so when they run a little late I like to take a pregnancy test just in case. Or you could use it to. However, the vast majority of the time they are very accurate if done properly. How often do evaporation lines occur? Evaporation lines don't happen all the. The pregnant line came up within 45 seconds. A pregnancy test detected as a positive when you're not actually pregnant is called a false positive. An evaporation line on a pregnancy test is caused by the evaporation of urine on the test area, causing a false-positive result. The mother of-two explains that she 'never' buys blue dye tests because 'they are known for having false positives'. How the Dye-Based Pregnancy Test Works. While I wouldn't consider that a false positive persay it also isn't a pregnancy. Nov 30, 2020 · Before discussing the difference between a faint positive line and an evaporation line on a pregnancy test result, it helps to know what can cause a faint positive test result. Feb 22, 2012 · False positive pregnancy test? dye smudge? 19 answers / Last post: 10/06/2019 at 3:22 am. Its revolutionary design came after extensive research with women and even won a Red Dot Design award in 2012. If you are not sure of the result, you may want to re-test within the first week of a missed cycle. A positive COVID-19 test during a trip can throw all your travel plans into limbo. Defintiely wait to talk to your RE if you have any doubts before stopping treatments. For a red dye pregnancy test, a faint line will look light pink whereas a blue dye test will show a light blue line. Blue dye tests are notorious for false positives. Feb 9, 2017 · Has anyone ever gotten a false positive on a pink test? I know the blue dyes are famous for it. First Response Faint Line - False Positive? You've taken a pregnancy test and you see a positive result, but you're having doubts: Can the test be wrong? Most home pregnancy tests are reliable, for example Clearblue's tests have an accuracy of over 99% from the day you expect your period, and while it's possible a test showing a negative result is wrong, particularly if you're testing early, getting a false positive is. I took one this morning and then one about 2 minutes ago. Jun 29, 2023 · For dye-based pregnancy tests, results are interpreted by the number of colored lines that appear in the test window shortly after urinating on the test stick, says Dr A positive pregnancy test result should be pink (or blue) just like the control line. I know that these tests are notorious for false positives (i wasn't paying attention when I bought it). “Mood changing” hair dye uses stabilized thermochromic ink molecules that shift when. Dye sublimation ink differs from common dye-based ink because the ink is transferred to the medium from a solid state to a gaseous state. For a red dye pregnancy test, a faint line will look light pink whereas a blue dye test will show a light blue line. If you get a negative result but believe you may be pregnant, you. Evaporation Lines vs Evaporation lines are faint lines that can develop on a pregnancy. Lilly Brooks. Feb 22, 2012 · False positive pregnancy test? dye smudge? 19 answers / Last post: 10/06/2019 at 3:22 am. Unlike a faint positive result, which will result in a light pink or blue line, an evaporation line does not activate the dye in the pregnancy test, so it may show up as a colorless or translucent line. In my heart I know it has to be a false positive, but I thought I would at least get some second opinions! At the beginning of year 3 TTC. Jul 8, 2022 · I have heard blue dye pregnancy tests are known for false positives i took a blue dye pregnancy test, and it was positive, should i believe the test? Dr. A faint positive line can simply mean that the levels of hCG hormone, often referred to as the pregnancy hormone because it is one of the first signs of pregnancy, are low. It's important to read the instructions mentioned on the pregnancy test so that you know what to look for. Had an ectopic pregnancy last year so hoping this really is our. This is my very first time trying for a baby with my fiancé & today I took a digital clear blue pregnancy test & a digital first response. I got my first positive from clear blue however my first response came back negative. (LUV), tested Covid positive after he visited a Senate hearing on Wednesday, with CEOs and re. But remember: False positives are rare. The first pic is what happened within the. False positives are also p. Gurmukh Singh answered Pathology 51 years experience May 27, 2024 · This could carry the risk of returning a false positive result should these women use a high sensitivity test for hCG. This can create confusion and uncertainty about whether you are pregnant or not While faint positive results are generally indicative of pregnancy, there is a small chance of a false positive Has anybody had false positives or evap on Blue dye tests that have had colour to them? I read an article saying there is no way it is possible for colour to show on the test line without hcg being detected. The ClearBlue test told her she was pregnant - displaying a small bue cross, as. (Note: For some reason, anecdotally, many mamas find that blue dye tests are more prone to evaporation lines. even my faint had blu dye on it and showed before the pink ones did. 2 False positives can occur if you’re taking fertility medications that contain hCG, if you have a rare medical condition (such as an. I will be taking another test later on but I'm kinda in shock. In the event of a chemical. Some tests will leave a very faint line as the urine passes the test indicator window that can appear to make the test positive Reportedly among conception circles, this is more common in blue-dye tests. But sometimes a faint line can be the spot where your urine evaporated from the stick. Have been NTNP for the past 6 months, but two days late as of yesterday (4/10 - although cycles have been very irregular in the past), and took a Walgreens brand blue dye test this morning at 6:15ish right when I woke up. Interpreting Pregnancy Test Pregnancy Due Date Calculator. " Check out the image below from glowing It shows a dye stealer at the top. If you get a negative result but believe you may be pregnant, you. In my heart I know it has to be a false positive, but I thought I would at least get some second opinions! At the beginning of year 3 TTC. False negatives are possible. Centers for Disease Control and Pr. Two visible lines mean the test is positive and the. Some potential causes include: Early miscarriage or chemical. Hello Everybody!! I bought a pack of three blue dye pregnancy tests from Rite Aid recently and I have used two of them. I've read the blue dye tests do tend to have more false positives too. Today got a barely positive for the blue test. Decided to experiment and take a blue dye test, one of the least reliable ones out there! I finally was able to see a true blue dye positive! Hope this helps. I'm sorry your both going through this. I move off to school in a month. Advertisement The first thing. Women should wait at least two weeks after IVF before taking a pregnancy test. This second line is where hCG (a pregnancy hormone) will interact with reagents on the test strip, resulting in anywhere from a faint line to a dark line depending on your hCG levels, indicating a positive pregnancy test. These blue dyes aren't my fav, but FRERs haven't been the best lately either FRER looks negative me, maybe an indent coming through a little. (RTTNews) - Gary Kelly, CEO of Southwest Airlines Co. This can make it harder to interpret faint positive lines on blue tests, especially in those early days when hCG levels are still relatively low. And sure, you could drink it if you want to get all nostalgic about your 1980s childhood. March 26, 2024 | by yahweh4lyfe. And this popped up super quick but now I'm thinking it's a fluke. Spend the extra couple dollars and get a name brand pink dye test! I used the third test at week 5 of pregnancy just to see if the line ever got dark (and because I would never use this brand again for early detection) and it was a definite positive. Defintiely wait to talk to your RE if you have any doubts before stopping treatments. well first off, you cant say its positive if its after the time frame. Pregnancy tests work by detecting the pregnancy hormone hCG. wegmans irondequoit Home urine test positive, DR urine test negative, Blood test positive April 30, 2024 | by mcgaritykn I'm an anxious mess and just don't really understand what is going on. As easy as taking a pregnancy test sounds, there are several factors that can affect the test results. Many people think that the pink dye tests are better than blue dye. The same thing happened to me a few weeks ago with a blue dye test. You must have ovulated. Advertisement. I need opinions please. A faint positive line can simply mean that the levels of hCG hormone, often referred to as the pregnancy hormone because it is one of the first signs of pregnancy, are low. Sometimes, however, you may get a negative result, then look at the pregnancy test later in the day to see that a positive line has magically. I had 2 false positives with blue-dye tests. Two days ago the US lawmaker made contact with several other senators at a lunch meeting. There are several reasons peo. Before discussing the difference between a faint positive line and an evaporation line on a pregnancy test result, it helps to know what can cause a faint positive test result. false positives with blue dye pregnancy tests? m Posted 05-18-12. waterloo crime rate It may be easy to think a faint line is a false positive, but it's very, very rare to get a false positive result. How Does a Pregnancy. Positive pregnancy test from Clear Blue shows 1-2 weeks. Blue dye pregnancy test I've heard of false positives from blue dye test but could this really be a false positive that everyone is talking about? My wonderful husband bought the wrong brand. Walmart equate early results I think my period is due by the end of the week I'm not sure. While the financial burden of a hotel quarantine is definitely worth keeping in mind, it should hardly be your only concernS. False positives are less common, but can happen with. but nope, i think in all honesty its down to the amount of blue dye in the test, i think that effects how faint or strong the evaporation line would be x. Sainsbury blue dye test. I could be 10-14 dpo I have no idea. Pink dye pregnancy tests are better than blue dye pregnancy tests. Learn stain removal tips to remove yellow dye stains, treat spots, and clean stains. Trusted Health Information from the National Institutes of Health T. Decided to experiment and take a blue dye test, one of the least reliable ones out there! I finally was able to see a true blue dye positive! Hope this helps. Moms Share Home Remedies for Pregnancy Morning Sickness. On a blue dye test, the line can appear as gray or even a lighter shade of blue. Blue dye tests are notorious for false positives. I will be taking another test later on but I'm kinda in shock. 13/08/2016 at 8:02 pm claire a(464) An evaporation line may appear as a mark on a pregnancy test if: More than 10 minutes have passed since taking the test. However, in rare instances, you can get a false positive from: a recent pregnancy (e after miscarriage, recent birth or termination) some rare ovarian cysts. also, if you only see the line when you tilt the test, that's not a +. The ClearBlue test told her she was pregnant - displaying a small bue cross, as. land cruiser floor mats Sainsbury blue dye test. The bottom test looks more positive to me though 🧡 keep us posted on a pink dye!. Some potential causes include: Early miscarriage or chemical. Illness: Some medications used for conditions like epilepsy or Parkinson’s Disease can trigger a false positive result on a pregnancy test. Do they also give false negatives?? Do blue dye pregnancy test cause false negatives compared to the pink dyed ones? Possibly : Any pregnancy test through urine can result in a false positive or negative result. A faint positive result on a pregnancy test occurs when a second line appears, but it is lighter in color compared to the control line. They were truly false positives as men and random drinks were also pregnant. Gurmukh Singh answered Pathology 51 years experience Dec 15, 2023 · In pregnancy test lingo, a dye stealer is when the positive test line is not just positive but so bold and confident that it makes the control line look like a faint supporting actor. For a red dye test, a faint line will look light pink, whereas a blue dye test will produce a light blue line. I read the reviews to them and sure enough, that was the number one complaint. They are both positive!!! I have read online that some people have had false positives with this brand of tests. the dye is only there to give a visual effect of the hcg mixing with chemical on the test line. Let's check the charts for a full temperature check of this vaccine makerMRNA Vaccine maker Moderna (MRNA) surged higher on Tuesday and Wednesday morning, but it has since. So do yourself a favour, and avoid blue dye tests. 13/08/2016 at 8:02 pm claire a(464) An evaporation line may appear as a mark on a pregnancy test if: More than 10 minutes have passed since taking the test. An evaporation line may be caused by waiting too long and reading the result after the time limit First, you can use pink dye pregnancy tests rather than blue dye pregnancy tests.
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Generally speaking pregnancy tests are really good in having very few false positives. if it's more shadow like or grey with no color it's a evap. if it's more shadow like or grey with no color it's a evap See full list on natalist. As we learn that COV. This includes testing too soon after a recent abortion, miscarriage, or. Do blue dye pregnancy tests give false positives Pregnancy tests hold a lot of weight. There should be colour in the test line for it to be positive. Good point. I normally don't use them but accidentally got them so that's what I'm using at the moment. After a false alarm in March, the milestone brings Jeff Bezos' ambitious dream one step closer to reality. Factors to Consider When Shopping for a Pregnancy Test. Foetal dopplers are unreliable and can provide false reassurance for those expecting a baby. how likely is it to get false positives using digital pregnancy tests? Just after taking that second test I read on here that blue-dye pregnancy tests are horrible and infamous for giving false positives. Trump was tested after aide Hope Hicks contracted the coronavirus. The pink dye tests are more reliable. False negatives are possible. Feb 16, 2024 · False positive pregnancy test. 13/08/2016 at 8:02 pm claire a(464) An evaporation line may appear as a mark on a pregnancy test if: More than 10 minutes have passed since taking the test. sorlock build baldurs gate 3 Accidental urination on the pregnancy test window or urinating too long on the absorbent tip can result in the pregnancy test dye flooding the display windows with either all pink or all blue dye. This second line is where hCG (a pregnancy hormone) will interact with reagents on the test strip, resulting in anywhere from a faint line to a dark line depending on your hCG levels, indicating a positive pregnancy test. But, with the other ones being negative I'm not sure it's a true positive And not sure if I want to bother with target brand because I've gotten false positives on them and they have horrible reviews. Fingers crossed for her. 13/08/2016 at 8:02 pm claire a(464) An evaporation line may appear as a mark on a pregnancy test if: More than 10 minutes have passed since taking the test. I've heard people say they get false positives with blue dye tests. Pregnancy blood tests are highly accurate. Went to dr that day & had bloodwork & was bfn. Anyone gotten a blue dye test that looked like a false positive & it was actually positive? Anyone have this happen, or everyone? lol Original poster's comments (26) I got the same results as the picture of the equate pregnancy test. I got this faint positive (within 3 minutes, mid afternoon urine) yesterday. Blue Dye tests do have a higher false positive rate. Swarup says any pregnancy test—regardless of type or cost—should be 99% accurate Oct 10, 2016 · My friend took a blue dye test in my house, it was positive, no ifs or buts, it was there in the time frame, it was blue and fat and perfect for a BFP, then she took another from the same twin pack, negitive, held her pee for few hours and a another neg on a first responce, the next day more neg's, its a few months later now and no pregnancy. Today, i took an early response equate brand test: I followed directions exactly and my line showed up straight away, albeit faint 13 dpo, but irregular periods and ovulated day 45 (know for sure bc I used ovulation strips). The Concern with False Positives. Evaporation lines are considered false-positive results. how to add bullet points in google slides False positive pregnancy test? dye smudge? Am I pregnant? Dye run or Positive Pregnancy Test? Am I pregnant? Implant 'Run out' could i be pregnant?. These false positives can occur if the test results are misinterpreted due to the appearance of evaporation lines. Jun 10, 2024 · 7 Possible Causes of a False Pregnancy Test is among the most common reasons for a false positive pregnancy test. As we learn that COV. False positives can occur if the test is read too soon or if there is a chemical interference that causes the test to produce a positive result when the woman is not actually pregnant. "We expect institutional investors to start de-risking portfolios and increasing hedges in preparation for market volatility," said James McDonald, Hercules Investments CEO Color changing hair dye is a unique and fun enhancement you can make if you know how it works. Blue dyes are known for faint or incomplete lines when negative. Chances of a false positive pregnancy test. even my faint had blu dye on it and showed before the pink ones did. Several years ago up and up had issues with false positives. On a blue dye test, the line can appear as gray or even a lighter shade of blue. I would pick up first response pink dye test and re-test in the morning. A line that's supposed to be red may appear light pink, for example, and a line that is supposed to look blue if positive will be very light blue. Some tests will leave a very faint line as the urine passes the test indicator window that can appear to make the test positive Reportedly among conception circles, this is more common in blue-dye tests. Whilst this is a frequent topic of discussion on the Mumsnet Conception boards, the general consensus is usually that pink dye tests - such as First Response Early Result tests - are more trustworthy than blue dye tests, which can be more likely to show evaporation lines and even false positives. Pregnancy test results are only valid for 10 minutes. How to Get the Most Accurate Results? For the most accurate results, wait until you have missed a period before you test. A chemical pregnancy can still give a strong positive pregnancy test. If you are not sure of the result, you may want to re-test within the first week of a missed cycle. Pregnancy test results are only valid for 10 minutes. Blue dye tests give horrible false positives. My best friend used two blue dye pregnancy tests today (she said they were EPT I think) and got two faint postives. Some potential causes include: Early miscarriage or chemical. hideaway bar idaho Feb 16, 2024 · False positive pregnancy test. Pregnancy tests work by detecting the pregnancy hormone hCG. First test had a very faint line, came back 15 mins later and the line had gotten darker. False positive pregnancy test? dye smudge? Anonymous. ) Hi ladies! My first time posting! I took a blue dye test yesterday evening and got a super faint positive. I would definately try with a FRER test in the morning, but if you found a shadow after only an hour after the first test, my bet is that it is a real BFP. Walmart equate early results I think my period is due by the end of the week I'm not sure. HCG stands for human c. If there is no HCG present in your urine, and you are not. From the inital positive test all the way through to labour and the postnatal period, there are some common pregnancy problems you need to be aware of. Some tests will leave a very faint line as the urine passes the test indicator window that can appear to make the test positive Reportedly among conception circles, this is more common in blue-dye tests. How many of you ladies have gotten a false positive on an equate brand early result test? I had a possible indent/vvfl on a FRER 48 hours ago. (Note: For some reason, anecdotally, many mamas find that blue dye tests are more prone to evaporation lines. The line may be light because the urine was diluted or it's early in your pregnancy. In the event of a chemical. So, if you took a blue dye pregnancy test the day before, and misinterpreted the evaporation line on the pregnancy test for a faint positive result (false positive), it may explain why your result has "changed" to negative overnight!.
I had a chemical pregnancy in October 23, and back then I actually only ever had positive on blue dye tests, so I think this is my first positive on a pink. But what does a true positive result look like? I decided to put together a Gallery of actual, “Positive,” results that you can look at that display both Pink Dye and Blue Dye Tests, manufactured by different. Jun 21, 2023 · Test more than once, especially if you are confused by the results of your pregnancy test. Then I grabbed some other brands and tried them the next day, all negative. Aug 29, 2017 · that looks like a positive! just for some accurate information blue and pink dye tests are relatively the same as long as you see the line within the time frame given, there is color to the line& the thickness is the same as the control line. the spot lake havasu The line may be light because the urine was diluted or it's early in your pregnancy. Before discussing the difference between a faint positive line and an evaporation line on a pregnancy test result, it helps to know what can cause a faint positive test result. On blue dye tests, evaporation lines are very faint. During an HSG, an X-ray records images of your uterine cavity and fallopian tubes while they're filled with a special dye Does a hysterosalpingogram increase the chance of pregnancy? "Tubal flushing" refers to the process of injecting dye. It didn't show up within the 10 minute mark but when I came back to the test an hour later there was. Apr 21, 2021 · Yesterday, I took 3 first response pregnancy tests, 2 digital and 1 dye and got positives and 2 generic digital tests and they were negative. shoe company named for a california city crossword clue Just because it's blue doesn't mean it isn't valid, but proceed with caution until you get that pink line test. However, as spam emails continue to flood our inboxes, email provid. I see them ALL the time. If you get a faint positive with a blue dye test, try again with first morning urine (so the line will be darker), or try again with a pink dye test, or go to the doctor for a blood test. I’ve also seen lines that are present even before you take the test, which are kind of grey. I was wondering on peoples personal experiences with these tests? Tia x I've never taken a blue dye test before, if this is just an indent/dye run, I know for sure I won't be getting blue dyes anymore😭 See all replies (1) IVFwaiting Any of you have the false positive blue dye tests?! This is a Walgreens test I took. however, i've taken 2-3 EPT blue dye tests, 2 yesterday and one this morning, and i could see a very faint positive. is shadman back If blood gets in the sample or if there is an infection present, the pH of the. Avoid superdrug test as evil for false positives and blue dyes can give evaps xx Emma Dd Maisie 8[emoji146] Dd Paige 5 [emoji146] Rainbow baby due 8/01/18 [emoji1405][emoji175] 0 Has anyone gotten a false positive on a Walgreens blue dye test? I usually get the pink dye but switched up. Blue dye tests are known to generate false positives, however, because an evaporation line (or "dotted line") may appear on the test. A New Modified Evans Blue Dye Test as Screening Test for Aspiration in Tracheostomized Patients J Cardiothorac Vasc Anesth and there were no FEES negative and MEBDT positive (false-positive MEBDT). The test is valid if read in the allocated time, anything later cannot be trusted.
What does a faint line look like? Each pregnancy test is different, with some brands using a red dye and others, like Clearblue, a blue dye. It was a pee on the stick test, so not sure if any urine may have splashed on to to the test window. With the Clearblue Early Detection Pregnancy Test, you can test for pregnancy up to 6 days sooner than your missed period (which is 5 days before you expect your period)[2]. I got this faint positive (within 3 minutes, mid afternoon urine) yesterday. So do yourself a favour, and avoid blue dye tests. It should also run from the top of the test window to the bottom and have the same thickness as the control line. See images below to get an idea of what a faint line can look like. As we learn that COV. This second line is where hCG (a pregnancy hormone) will interact with reagents on the test strip, resulting in anywhere from a faint line to a dark line depending on your hCG levels, indicating a positive pregnancy test. Looks positive to me! I saw a positive with a blue dye test before I saw one with FRER (which made me nervous because it was the Up&Up brand test, which has terribly reviews for giving false positives). If blue in color, such lines are known as blue dye run on a pregnancy test. But those look like the start of the real thing. If the test line appears within the instructed time frame, there is hCG in your system (you got a positive result!) Always check the date, since expired pregnancy tests can yield a false positive or a false negative result. Show 3 Previous Comments. False positive? 49 answers / Last post: 15/02/2020 at 7:39 pm. Many people think that the pink dye tests are better than blue dye. On blue dye tests, evaporation lines are very faint. oscar's shoe repair If you’re trying to get pregnant, it’s important to time sexual intercourse with the days that you ovulate. Advertisement Yellow streaks are nothing to be afra. If there is no HCG present in your urine, and you are not. Yellow streaks are nothing to be afraid of. If you're ever unsure of your pregnancy test result, repeat using another test, or see your doctor. If you’re trying to get pregnant, it’s important to time sexual intercourse with the days that you ovulate. I've been having lower backaches for atleast a week, some cramps off and on and my body. What does a faint line look like? Each pregnancy test is different, with some brands using a red dye and others, like Clearblue, a blue dye. When it comes to pregnancy tests, false negatives are much more common than false positives. I could be 10-14 dpo I have no idea. Two days ago the US lawmaker made contact with several other senators at a lunch meeting. The mark has no visible dye in it. Positive pregnancy test from Clear Blue shows 1-2 weeks. net, one visible line on a pregnancy test means the test is negative and that the woman is not pregnant. I took a different brand yesterday and it was negative. Apr 16, 2024 · If your test shows a negative result, no pregnancy hormone (hCG) was detected in your urine. From the chemicals that pollute and the massive use of water, the traditional method of dyeing blue jeans is an environmental disaster. I would recommend not using them. You may not be pregnant or you may have miscalculated your menstrual cycle and the pregnancy hormone level may not yet be high enough to be detected. what is ssundee net worth What caused this False Positive Pregnancy test? SeattleFF. Positive pregnancy test from Clear Blue shows 1-2 weeks. See section above "hCG levels in perimenopause". Always use pink line Urine tests are the doctor aren’t any fancier than what you can buy at the dollar store (or any ClearBlue test) — they’re FDA regulated so any test has a minimum threshold. This is only produced when you are pregnant. Report as Inappropriate. After a false alarm in March, the milestone brings Jeff Bezos' ambitious dream one step closer to reality. Some brands use a red dye while others may use a blue dye. If you are taking a pregnancy test I would assume you have good reason to, so a follow up test seems advisable. These false positives can occur if the test results are misinterpreted due to the appearance of evaporation lines. Advertisement Whether you're read. Sitting in the COVID-19 test. Jun 21, 2023 · Test more than once, especially if you are confused by the results of your pregnancy test. What does a faint line look like? Each pregnancy test is different, with some brands using a red dye and others, like Clearblue, a blue dye. One particular brand had over 200 reviews and all but a few were 1 star because of false positives.