(pregnancy test)Why did I see a faint positive side line an hour after I did the test?

Answer 1

You can't rely on any test results that appear after the time limit. There is a reason the tests have a time limit-- and torturing us is not usually that reason ;) If a line appears in the "results" window after the time specified in the directions, wait a couple days and test again. HPT's are rapid assay diagnostics, which means any results appearing after the "rapid" time limit of 10 minutes are invalid-- after this time, natural changes in the chemicals may cause lines to appear.

Answer 2

Those are known as evaporation lines. Do not read the test after a 5-10 minute time frame as this can cause a false positive. If it was negative before, you may have taken the test too early but the pregnancy test would not be legitiamate. Wait and take another test. Even if you are not pregnant waiting longer than the time frame can cause a false positive and is the only way (unless you take fetility treatments containing hcg) that you can have a false positive error. False negatives are more common than false positives and the majority of false positives are because of human error (the other minor false positives are caused from fertility treatments containing hcg.)

18 weeks pregnant with first

Answer 3

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.

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Answer 4

Evaporation can sometimes cause the positive line to appear - or say it says on the box.

If it wasn't there 5 minutes after doing the test, don't put too much hope on being pregnant when it showed up an hour later. Wait another few days, and if your period still haven't started, do another test.

Answer 5

It's an evaporation line.

Reliable results can only be read between 3 and 10 minutes after starting the test. (Read your test instructions.)

If you were negative when you did the test, and only saw the positive line an hour later, you're not pregnant.

Answer 6

It's meaningless.

If you are truly worried, take another test in a few days, but every test I've ever taken says not to read the results after a certain legnth of time (I think it's 20 minutes). The results are not valid at that point.

Answer 7

Sometimes if the test sits too long a false positive can occur. That's why the directions tell you to read the result within, say, ten minutes.

I think it's because the hormone that indicates pregnancy on those tests is always present in urine, just in smaller amounts, so if it sits long enough you may get a bar.

Answer 8

It could be an evaporation line, thats why you are not supposed to read it after 10-20 minutes. Retake a test tomorrow morning. Goodluck

Answer 9

Evaporation line. Do NOT take it as a positive unless it came up in the time frame. Throw it away and do not pay any attention to that line. If you still think your pregnant, just take another test!

Answer 10

its called an evaporation line . never read a test after 10 minutes