What's an evap line?

tomommie08

Wh

megemoney

Not sure what your post is supposed to say, but I will answer your post title.  An evap line is an evaporation line on (usually) a home pregnancy test.  It is a line that can some times be mistaken for a positive test line.  It forms when the pee evaporates and leaves behind a line where the dye should be if it were positive.

If I am off on any of this, or anyone has anything to add... please feel free to correct me or add on.  

dani2480

It's important to follow the instructions carefully on the package of whatever pregnancy test or ovulation prediction test you are using. Generally they will tell you to look at the reading within a certain period of time, and to discard any readings you may get after that window. The reason for that is that an "evaporation line" could form (per what megemoney said), making it look like a positive result, when it fact the result is negative.

holly321

Sometimes the line does show, even when you use the test properly.  It is more common on blue line tests, and it is a sob!

mrsadamc 05

I thought the strip on the right was just an evap line.  

Then I tested again (strip on the left). 

 

holly321

Congratulations!

Switzerland87

megemoney:

Not sure what your post is supposed to say, but I will answer your post title.  An evap line is an evaporation line on (usually) a home pregnancy test.  It is a line that can some times be mistaken for a positive test line.  It forms when the pee evaporates and leaves behind a line where the dye should be if it were positive.

If I am off on any of this, or anyone has anything to add... please feel free to correct me or add on.  

All of the above, plus, evap lines can also occur on OPKs, which is why any line that is not at least as dark as the control is just as negative as no line at all. At least on an OPK.