My friend of 4 (5th on the way) says she never payed any mind to the "expired" time. She said she would put a test away thinking that it was negative and went back to it the next day and read it was positive. And she was!
2007-01-16 11:42:05 · 7 answers · asked by ArtBaby 2 in Pregnancy & Parenting ➔ Pregnancy
an evap line looks like a positive. tests cant be read for an accurate result after 10 minutes
2007-01-16 11:45:08 · answer #1 · answered by kleighs mommy 7 · 1⤊ 0⤋
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.
http://www.peeonastick.com/hptfaq.html
2007-01-16 19:46:18 · answer #2 · answered by ஐ♥Julian'sMommy♥ஐ 7 · 0⤊ 0⤋
You know I was wondering that also I took a Pregnacy Test yesterday @ night was negative and today in the morning it had a light faint line i'm so confused went to the Doctor's on January 4th took a urine and blood both came negative here is the thing I haven't got my period since November 28 so I am just waiting this month to see if I get my MSP this month I am a bit worried on December the day I was suppose to get my period I spotted for like 3days nothing heavy or anything only when I would wipe light pinkish color and this month I haven't got it either so I'm still waiting to see what happens you know NO period means no ovulation so I am concerned...
Happy New Year to you and your Love ones :o)
2007-01-16 19:48:51 · answer #3 · answered by Help? 3 · 0⤊ 0⤋
That is because negative results disappear after about 10-15 minutes however a positive stays for at least 24 hours. Hope that helps...
2007-01-16 19:48:00 · answer #4 · answered by jule9104 3 · 0⤊ 0⤋
i honestly think they just tell you not to read it after ten min to avoid any wrong results even though they may still be true. i know i took two once both were neg. then the next day i pulled them out of the garbage and they were both very positive and sure enough i was
2007-01-16 19:56:15 · answer #5 · answered by Anonymous · 0⤊ 0⤋
i don't think the lines go away once they appear.
2007-01-16 19:45:54 · answer #6 · answered by anonymous 6 · 0⤊ 1⤋
huh
2007-01-16 19:50:23 · answer #7 · answered by a 3 · 0⤊ 0⤋