Can a pregnancy test showing two red lines result in a false positive for pregnancy?

A positive result on a pregnancy test strip showing two red lines may sometimes indicate a false pregnancy, primarily determined by the testing procedure and the intensity of the line colors. If the pregnancy test strip is stored with other contaminants or chemicals, it may lead to a false-positive result. When one line appears darker than the other, this is considered a weak positive, among which the rate of false positives is relatively high.

Pregnancy test strips detect the presence of human chorionic gonadotropin (hCG) in urine to determine whether a woman is pregnant. Before using a test strip, check that it is within its expiration date and confirm its validity. Carefully read the instructions before use and follow them precisely to ensure accurate results. Generally, about two weeks after sexual intercourse, a pregnancy test can be performed. After correct operation, if two red lines appear on the test strip, this indicates a positive result and a high likelihood of pregnancy. However, it is best to visit a hospital for further confirmation through blood tests and abdominal ultrasound.

Although the chance of a false pregnancy when two red lines appear is low, certain conditions such as systemic lupus erythematosus (SLE) may also cause elevated levels of hCG in the blood, leading to early pregnancy-like symptoms. Therefore, it is recommended to seek prompt evaluation at a hospital's obstetrics and gynecology department for a comprehensive assessment to confirm whether pregnancy has occurred.