Pregnancy Test Faint Lines and Evaporation Lines

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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

I took a home pregnancy test and it came up with one single blue line, what does that mean? and also my boobs are really sore and swollen, and my stomach has gotten a lot bigger, and i get sick in the mornings. Am i pregnant?

i threw the box and leaflet out, to my home pregnancy test. The test came up with just one single blue line, what does that mean?

Is 12 days after my ovulation can i do home test, please

Hi,

I missed my period for 10 days. I always have a regular period until this month. I did a pregnancy test and it was negative - I think...it was kinda faint but negative sign. And I'm 42.

Is it just sign of perimenopause or pregnant??

Thank you!

I missed my period for 3 days and I did a pregnancy test.
The result was positive but one of the strips was faint but I got the result instantly and the next day when i look up the strips its both negative, I've checked again in the morning and it was possitive but the cross sign is a little faint my qustion is am I pregnant?

My last period I only bled for a day then it stopped, Iv just done two tests. One came up negative with a faint positive reading on it, the other came up negative.

i saw my period on 19th of may, and it came back in 3 weeks time on 8th of june. i have a 28 day cycle i am suppose to have my period on 5th of july. i had a test done on the 1st july and it showed a fainted line and a normal line. does that mean im pregnant.

I had my periods on may 11th 2010,and after 8th or 9th day had sex with my husband every alternate days.My period was due june 12h /15th since i have a 35 day cycle and i also took a HPT after that but it ws negative.I haven't got my periods till today i.e 20th of june.I'm confused.Help.

Hi
My period was supposed to start Feb. 5, 2010. But it hasn't, its now june 15 and i don't know what to do. I took a pregnancy test and it came out funny. There is a half faint line that looks like it started to make a plus sign then stopped. Am I pregnant...And wouldn't I be far enough along to have a clear positive answer if so?

Today is my 20thday shall i test home pregancy it shows result

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