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?

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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. Early-Pregnancy-Tests.com 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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Comments

On this morning a took a pregnancy test and i wait about 2 min but just one line show up so i just put on the trash, but i decided to take another one just in case. So while i was doing my second test my husband call me asking to pick him up at work, so i didn't see the results when i came back home i got the test and there was a "+" but the vertical line was very light, should I take another test? I'm confused

Hi! I am a happy married mom with 3 children. I do have very normal heavy periods and it being on time. This last time, my period was way lighter and shorter. With my first child, I did have a period and being pregnant with her. So with this time, I took a pregnancy test. The test was very faint positive right 2 mins. after it was taken then like 2 mins. later it fainted away. What does this mean? Any advice? Thanks!

pls i want to know
1. can sexual intercourse with my husband cause a miscariage just before my menstruation?

2. if fertilization occured, is it possible for the fertilized egg to come down as my menses again

Hello, my name is dahlia and i went and bought a pregnancy test yesterday and i took one around 6 pm and it showed a faint line. my oldest sister said that i was pregnant because this happened when she took one with her first born son. then i took another one the next morning and it showed a faint line but it was slightly darker than the first one. my mother said i might not be and so i am very confused. i think i am because my husband and i dont use protection. i am unsure if i am or not so i would like some advice from anyone who can offer it.

hi im bethany. im 21 and my husband and i have been noticing strange things happening to me lately. i'm 2 months late and that's after having a period on time for 5 months. i took a pregnancy test about a week or so ago right before my husband went to work and it showed a very faint plus sign and a straight line in the other window. could i be pregnant? we are wondering because we lost a baby last december. any answer would be nice. Thanks.

Ok so I had sex for the first time and it was unprotected and so I took a pregnacy test that my friend got my and 3 lines showed up a brown blue and red vertical lines. Does this mean I'm pregnant?

hi i am a housewife. i done a home pregnancy test with a tube . it showed 1 dark line and 1 light line but after 2 days when i checked the same tube i light line does not appear , only i found 1 dark line. Does it mean i am not pregnant.

I have never been pregnant before and yesterday afternoon I took an equate preganancy test and it had a very faint line before it was done reading. This morning I took one from the same pack and it was negative. I am a few days late but today marks day 28- lately they start before. Since Jan. I have been spotting the first few days then starting my cycle, which use to be 28 days long, then started being 20,26, then this last time was 18 days. I have been urinating a lot plus common symptoms that can be confused with pregnancy or period but I am unsure, can I be pregnant?

I have never been pregnant before and yesterday afternoon I took an equate preganancy test and it had a very faint line before it was done reading. This morning I took one from the same pack and it was negative. I am a few days late but today marks day 28- lately they start before. Since Jan. I have been spotting the first few days then starting my cycle, which use to be 28 days long, then started being 20,26, then this last time was 18 days. I have been urinating a lot plus common symptoms that can be confused with pregnancy or period but I am unsure, can I be pregnant?

Dear Jenett,

I would test again, now that it's been a few days, but it sounds to me like you may be pregnant... Hope the best for you!!

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