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Pregnancy Test Faint Lines and Evaporation Lines

The Two Big Pregnancy Test Questions:
1) How Early Can I Test for Pregnancy?
2) What Does a Faint Line Mean on a Pregnancy Test?

> Back to Pregnancy Testing

How Early Can I Test for Pregnancy?
One question women frequently ask when trying to conceive is: How long do I have to wait before I can take a pregnancy test? Though hCG is produced at different rates in different women, there are general timelines for deciding when to test. However, when testing on the early side, do not rely on one test for conclusive results - especially a negative result: the hCG threshold for displaying a positive result on a home pregnancy test may not yet have been reached.
Early Detection Pregnancy Tests
When a woman becomes pregnant, the amount of hCG in her system should be around 25 mIU at 10 dpo (days past ovulation), 50 mIU at 12 dpo, 100 mIU at around two weeks dpo (these are averages that may deviate among different women). Test sensitivity equates with early-detection - and the lower the number, the sooner a test can detect pregnancy. At 20 MIU test sensitivity, you can begin testing at 7-10 days post ovulation, though the earlier you begin testing, the higher chance you have of getting a false negative. carries early-detection pregnancy tests capable of detecting just 20 miu/ml hcg.
Here, implantation of the fertilized egg needs to take place before hCG is produced by the developing placenta, and that generally occurs at 6-10 dpo. If you decide to test early, make sure you perform a few follow-up tests every other day using first morning urine. Your hCG levels should rise exponentially, doubling every 2 days - which means that the follow up tests should eventually detect pregnancy if you are, in fact, pregnant.

For earliest detection of pregnancy, use first morning urine, as this urine sample contains the most concentrated amount of hCG. If using first morning urine is not feasible, avoiding urination for several hours before using a pregnancy test.
 Faint Line
A faint color band in the test area of a pregnancy test indicates, in most circumstances, a positive result for pregnancy.
However, a faint line appearing after the designated reaction time of the test may be an "evaporation line".
What Does a Faint Line Mean on a Pregnancy Test?
On a pregnancy test, a faint test line - or color band - is usually indicative of a positive result, as long as it's read within the time frame - or reaction time of the test (usually at 5-10 minutes). If you perform the pregnancy test properly and read results within the recommended time frame, then a faint or weak color band in the test area is very likely a positive pregnancy test.

Evaporation Lines
Evaporation lines, however, can confound results if tests are not interpreted within the clinically recommended time frame. An evaporation line develops when the urine on the test area begins to dry, leaving a faint, usually colorless line. Evaporation lines appear to show up (or not show up) as a result of the composition of the particular urine specimen - and they may appear on any test regardless of brand.

Explanations for Faint Positives
  • Testing Too Early: If you test too soon, hCG may not be at a sufficient level for test detection. See the section above on determining when to take a pregnancy test.

  • Low Test Sensitivity: Different tests detect hCG at different levels, from 20MIU to 100MIU or more. 20 MIU tests will display a faint line when when hCG levels are at 20 MIU, while less sensitive tests will display a negative result. At 50 MIU levels, a 20 MIU test will show a stronger color band while a 50 MIU test will show a very faint band.

  • Dilution of Urine Specimen: Urine specimens may be diluted due to frequent urination or consumption of liquids. First morning urine is recommended for pregnancy testing as it contains the most concentrated presence of hCG.

  • Chemical pregnancy: Sometimes an early pregnancy is detected - followed by negative test results. A chemical pregnancy means implantation takes place (hCG is produced for a short time) followed by a miscarriage (generally, before any other pregnancy symptoms are detected).

  • Evaporation Lines: Always read your test results within the test reaction time (usually 5 minutes) as evaporation lines can develop as the urine dries on the test area. Evaporation lines appear to show up (or not show up) as a result of the composition of the particular urine specimen - and they may appear on any test regardless of brand.
Remember, a pregnancy test does not function like "light switch" - and just turn on: different hCG levels will produce different gradients of color bands (from very light, faint lines early in pregnancy to dark, rich color lines later on as hCG develops).
Read More About Pregnancy Tests
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I had evaporation line on my test yesterday and today a very light spot (implantation?).
Could the evaporation line show up because I implanted?
Also, the line on the pregnancy test showed after only 2 minutes.

My period was due on june 28, bt it didnt arrive to july 1 and when it did come on i was very light and stayed only two days ,i have took eight hpt only one was positive idk what to believe because it was almost 10hrs later when i looked at the test because i took it at a waffle house when i took it so i just stuck it in my purse,bt anyways im having all the signs of begin pregnant ,i didn't have dis problem wit my daughter,can sumbody help me plez.

I'm 2weeks late and I've tookn 4 pg test and they all have came bak neg. I'm pretty acc on when I'm going to start my period. My last one was the 6th of june. Could I be preg?

Hello I have the mirena. I began feeling sick last week so I took the test just to see because I never get my period. I took the test and it was negative. I took another one that night and it came out one bold band and a faint band. I took one again this evening and it was was one line. What is this mean?

I did a pregnancy 5 days early before my period was due. I used all kind of pregnancy testers but none of them gave me accurate results, all came negative or faint lines, then I tried clearblue digital tester which was so simple for me it said I'm pregnant 1-2 weeks. Wow! I'm so proud mum with baby girl Anisha born 7/3/2012! Weighed 7lb 3oz.

The best tester to use early in pregnancy, I will reccommend is clearblue digital pregnancy tester, it's just so accurate it gives results in just three minutes! And 4 days before your period is due. It also depends with the level of hcg in your urine. Another thing it could be you also have a chemical pregnancy. First It show you, your pregnant (positive), and then after few days it's might show you a negative, your no longer pregnant, because you have miscarried the baby. Some people won't realise they were pregnant and miscarried too.

my last period started on the 27th april. i havent had my period yet just some mild spotting. i took a test today and only either end of the second line showed up nothing in the middle of the line. what would this mean? im too nervous to go to the dr just yet. tmi but with the mild spotting it was like a fluro red. please help

So I took a pregnancy test yesterday I saw a very faint line so faint my mother didnt notice it, later when I went to throw it out I noticed that the line is just barely darker.. Could this mean that I could see the evaporation line as soon as I took the test or could this just be a positive result?!! HELP PLEASE!!!

Me and my girlfriend just tested out one of the 1st Response pregnancy tests. The result was one line along with a faint 2nd line. If its very faint does that still mean she is pregnant? Also its been maybe a little over a week since she was supposed to have her period, is it to soon to tell? Please respond soon.

I went to d doctor and d doctor said I was positive so I went and bought a test it was negaive just one line then I took another one it was negative again so I went to d doctor again and it was positive one line was pink and the second was so light u could barely see it so d doctor done a ultrasound we couldn't see nuthin so wat do dat mean????

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