Menstruation delays 20 days test paper detects not pregnant accurate

If menstruation is delayed by 20 days and the test strip detects that you are not pregnant, it is usually more accurate, but the possibility of pregnancy cannot be completely ruled out.

Early pregnancy test strips mainly determine whether you are pregnant by detecting the HCG level in the urine. Generally, some time after conception, the HCG level gradually increases, and the test strip can show positive. If the operation is correct and the quality of the test strip is reliable, the accuracy is high. Although the test strip is accurate, false negatives may also occur. For example, the test time is too early, and the HCG level has not yet increased to the detectable range; or the test strip may be improperly stored or damp, etc., which may affect the test results; Contaminated urine samples can also lead to inaccurate results.

If there are doubts about the test results, consider going to the hospital for a blood HCG test, which is more accurate. In addition, doctors may also combine comprehensive judgments such as ultrasound to determine the cause of delayed menstruation.