when a pregnancy test sits for a day will it change to positive if it started out saying negative? retest??
Answers:
Yes it will change to a postive but this is called a evaparation line.
It does not mean though you are pregnant. You should not read results after 10 minutes.
go to http://www.peeonastick.com
7. 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.
go to that above website and good luck
Other Answers:
it shouldn't change, but if it does then yes, you need to retest.
Sometimes there will be a 'evaporation line" if you read the negative test later than the test instructions indicate. If it was negative but you still don't have your period I would wait a day or so and then retest. Go to www.peeonastick.com for answers about test sensitivity, what negative and positive results look like for different brands and info on evaporation lines. Good luck!
Source(s):
mom of 3, pregnant with #4 The urine on the test will contain hormone hcg if you are pregnant. Since you peed on it and left no more of the hormone can get into the test so it shouldn't change. Always double test though for your own piece of mind
Yes there's always a possibility. But usually test in the morning to get the accurate result.
No way posibile,negative is negative.wait until you are 2 wks late then retest,take it first thing in the morning for best result.you need to retest because after so much time (i think it is like 15 minutes) the test is not supposed to be accurate anymore. Yes it can change and give a false positive (evaporation line) Any result after 10 mins should be disregaurded
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