An evaporation line is a slight streak that appears where the positive line on a pregnancy test should be. Evaporation lines are colorless streaks, not faint lines. They typically appear if a person waits for longer than the suggested time to read the test result.
What does an EVAP line look like on a blue dye test?
The evaporation line typically shows up as a very faint, thin and almost colorless vertical line. If you test early and have low levels of hCG, the vertical line may be faint. Again, if you read it after the recommended reaction time, the vertical line is most likely an evaporation line.
Do Clear Blue pregnancy tests have evaporation lines?
Evaporation lines are common on pregnancy tests, but they don’t appear every time. Some pregnancy tests have instructions to check results after two minutes. Others have instructions to check results after five minutes. … Evaporation lines on pregnancy tests are generally colorless, but not always.
What does an evaporation line look like on a pregnancy test?
An evaporation line on a pregnancy test is a faint line (or rather, mark) caused by a test reaction that occurs when the urine evaporates, or when the test gets wet. Sometimes this line appears in the test window, making it look like a faint positive result. Evaporation lines are colorless streaks, not actual lines.
Is it an evaporation line or faint positive?
It’s also important to note that while an evaporation line appears faint, a faint test line on a pregnancy test doesn’t automatically suggest an evaporation line. A faint positive test line can also appear if you take a pregnancy test shortly after implantation when your hCG level is low, or if your urine is diluted.
Do blue dye tests give false positives?
Blue dye tests are notorious for false positives. In other words, you may test and see a blue + symbol, but not actually be pregnant. … Pink dye tests are more reliable and false positives are extremely rare. My preferred pink dye test is the First Response Early Result (FRER).
Why are blue dye pregnancy tests bad?
Blue dye tests are known to be more likely to produce evaporation lines than pink dye tests. You should also be sure to read your result within the listed time limit. Each brand of pregnancy test should indicate on the box when the test results should be read.
How can you tell if an evaporation line is positive?
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.
Can a pregnancy test change to positive after 10 mins?
The instructions on most pregnancy tests will advise you to read the results within a certain window of time. This usually ranges between a couple of minutes up until 10 minutes later. … As a result, the test may start to display a positive line.
What happens if you pee too much on a pregnancy test?
In other cases, you are asked to dip a test strip into a cup of your urine in order to test for pregnancy. In either case, too much or too little urine will result in an inaccurate result—generally a false negative as opposed to a false positive.
Do EVAP lines show up on negative image?
If you had a true evaporation line, future tests will show a negative result. On the other hand, if your test showed a faint line, you should continue to see the line darkening with each day that progresses. (See image below.) An evaporation line will not do this.
How faint Can a pregnancy line be?
Any positive line, no matter how faint, means your result is pregnant. Levels of hCG in your body will increase over the course of your pregnancy. If you test early, your hCG levels may be still be low and you’ll see a faint positive line.
Will an EVAP line washed away?
As the water moves across the test, it will “wash away” an evap line. The control line (as well as a true positive test line) will not wash away.
How long do evaporation lines stay on the test?
What Is an Evaporation Line on the Test? Every kit has a specified amount of time within which it displays the result. This time is usually somewhere around 5 minutes. If the stick is left around longer than that, what happens is that a faint line appears on the area where the result is displayed.
Can a faint positive line disappear?
“If the pregnancy is very early, the hCG level in your urine may just meet the threshold for being detected. You will see a faint line that can disappear over time,” Phillips says to Romper in an email interview.
Do pink dye pregnancy tests have evaporation lines?
Many people believe that, compared to their blue counterparts, pink dye tests are less prone to getting an evaporation line. This faint, colorless line can make reading a result more confusing, and deceive someone into thinking they have a positive result, when, in fact, the test is negative.