An invalid test is unable to show any line and provide accurate information. When the T (“test”) line shows up without the C (“control”) line, the test should also be considered invalid. Some tests combine two lines perpendicular to each other. If the test has been improperly stored, such as being exposed to excessive heating or left out of its airtight wrapping for too long, the chemicals in the strip may break, and therefore the test is unable to work. False positives and false negatives occur when you do not follow the rules or take any medications. If the test is invalid, the only thing to do is to repeat the test.
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David from Healtheappointments:
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