How can you tell the difference between an evaporation line and a positive pregnancy test?

Evaporation lines only appear on tests that show negative results. A positive test would change color in the same spot, blotting out the evaporation line. If a person sees an evaporation line, it means that the test is negative, or it was taken too early in the pregnancy to show a positive result.

Do EVAP lines appear within time limit?

An evaporation line may be caused by waiting too long and reading the result after the time limit. Although the time limit is usually the culprit for creating an evaporation line, it is not always the cause, and an evaporation line may develop even within the time limit.

What does the evaporation line look like on a pregnancy test?

There are some evaporation lines that do have color—either a light blue or light pink. The color, however, is very faint and not as dark as the color of the control line. The evaporation line can also sometimes appear greyish. On blue dye tests, evaporation lines are very faint. This type of pregnancy test kit has two windows.

How can you tell if your pregnancy is a BFP or EVAP?

Most will tell you if it has colour, it is a positive, if it’s grey or discoloured, it’s an evap. Sometimes with very light lines it’s hard to tell though, so here is how you can know for sure: Put a drop of water in the result window!

How to tell an evaporation line from a BFP?

If indeed it was an evap line, the test will look negative (because you’ve “washed off” the stains, and additionally, re moistened what is possibly simply a dried out control line which can also produce a strong Evap line.) If however, it is dye that caught your eye- well- it should be even easier to see now.

How to interpret the results of an EVAP line on a…?

Unlike a faint positive line, which can be a light blue or light pink (depending on the brand of the test), an evaporation line is nearly colorless. Dr. Rizk says that “manufacturers recommend that you should not read tests after a designated time period, as most test brands have the possibility of developing evaporation lines.”