Evaporation lines on pregnancy tests are shadow like lines that appear in the result area of the pregnancy test kit. These faint and colourless lines develop when the sample urine in the test area begins to dry up. Evaporation lines closely resemble positive pregnancy test with only one exception that it is not as visible as the first one.
Faint lines that appear because of insufficient level of pregnancy hormone (Human Chorionic Gonadotropin-HCG) are often confused with evaporation lines. However, one must conduct the test again after 72 hours for confirmation of result. An evaporation line on a pregnancy test can even make the result of the test look positive. Checking test results within the recommended time frame (as per the manufacturer’s instructions) can help in avoiding evaporation lines. Recommended time for checking the result can differ from company to company but most of them recommend a certain time duration of five minutes between the time the test is done to when the results show. The maximum time for interpreting the result is not more than 30 minutes after taking the test.
You may also use the other home tests that don’t use lines for testing pregnancy. Digital pregnancy test may also be used as an alternate test.
Evaporation lines can appear on any home pregnancy test kit irrespective of its brand. So, do not be unmotivated if the first few pregnancy tests do not show any accurate reading from the test. The next thing to do would be to get a blood test done.
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