The actual occurrence of testing errors is very rare. However, there are several possibilities that can cause a test pack to provide incorrect results, such as production defects, improper storage, or damage due to exposure to heat and water. In addition to technical reasons like those mentioned above, users can also be at fault in conducting the test. For example, waiting too long to read the results or misinterpreting faint lines as positive results.

The second possibility is caused by the discovery of a small amount of hCG in the urine. The test results are not inaccurate, but a miscarriage has occurred at this stage. Low hCG levels can be an indication of a miscarriage or chemical pregnancy, where the embryo does not implant or grow in the uterus. In addition, this hormone can still be found in the urine if a woman has recently undergone an abortion process.

"Positive results on a pregnancy test can also be caused by an ectopic pregnancy. Ectopic pregnancy is a condition where the embryo implants outside the uterus. If a mother experiences this type of pregnancy, she must take action to remove the embryo."

"Pregnancy of grapes can be the cause of a positive pregnancy test result. Grape pregnancy is a type of non-cancerous tumor resulting from a non-viable pregnancy, or abnormal growth of foreign objects inside the uterus. Other medical conditions that can affect it are urinary tract infections, ovarian cancer, and kidney disease."

Medications can also cause false positive results on a test pack. Some drugs such as anticonvulsants, anti-anxiety drugs, antihistamines, diuretics, chemotherapy drugs, antipsychotics, drugs used to treat Parkinson's disease, and methadone can affect this condition.