is the evaporation line on a hpt...?

Question

the same color as the lines on the test? or are they a different color? because i took a test one day and i saw a horizontal line (very clear blue) and then i saw a very very thin BLUE line. it was as thin as a thread.

i had to wait approx 3 minutes for the results to show, but then 2 minutes later, the other line showed up.

Answer 1

It sounds like it was a positive result. I would test again in a few days, perhaps with a digital test this time, making sure to use your first morning urine.

The evaporation line is a very light line which is the same colour as the lines on the test, however it usually shows up after the time at which the test results become invalid.

Answer 2

Re-test using first morning urine.....

v=What's an evaporation line? Evaporation ("evap") lines result with the test's antibody strip just looks slightly different than the space around it. There is a line of antibodies (usually made from mouse cells) in the Control and Test section. The Control line binds with any liquid and turns pink (or blue, in tests using blue dye.) The Test/Result line turns pink only if pregnancy hormone is detected. If not, the moisture passes over this strip and does not turn pink. It may, however, become more visible when the light hits the moisture on the strip-- it may appear gray, colorless, like a "dent" in the test, or like a "ghost line." It may appear at any time-- as soon as the urine hits it, after a few minutes as the test absorbs the moisture, or after the 10-minute time limit. It may appear when the test is drying, or after it has dried. It may disappear as the test is drying, or after the test has dried, or not disappear at all.

The simple fact is that there is always "something there" that is slightly visible-- it's simply the antibodies on the test that would turn pink in the presence of hCG. When the test becomes wet, or as it dries, or after it dries, the antibody strip may become more visible. Therefore, all tests may have them. It is not a defect; it's just how tests are made.

A real positive is identified by its color (pink or blue, whatever the color of the test's dye is) and its appearance within 10 minutes of urinating on the stick. A line that appears after 10 minutes, regardless of color, must be considered an evap line and is caused by the test's chemicals changing. HPT's are rapid assay diagnostics, which means any results appearing after the "rapid" time limit of 10 minutes are invalid.


The positive line is really faint. Is this okay? An HPT tells you exactly one thing: your urine either has detectable pregnancy hormone in it, or it doesn't. The darkness or lightness of a line doesn't mean much. Generally speaking, a very light line can mean there is a small amount of hCG in your urine, and a very dark line can mean there is a larger amount of hCG in your urine. This is why you may get a faint positive at 10 DPO but a darker positive at 18 DPO. However, this is not always true. Tests are all different, and even tests in the same box may differ in sensitivity. Comparing light/dark lines will just drive you nuts. If you see a line in the "results" window, you're preg!


GOOD LUCK

Answer 3

Within that short of a period you might have a positive result. Test again in a few days, it may be so early you don't have enough of the hormone to show on the test.