False Positive Pregnancy Test: What Causes It & Is It Cancer?

No, a false positive pregnancy test does not indicate cancer. Home pregnancy tests detect human chorionic gonadotropin (hCG), a hormone produced by the syncytiotrophoblast after implantation. Cancer does not produce hCG (except rare germ cell tumors or choriocarcinoma, which would cause a true positive).

Causes of False Positives

• Chemical Pregnancy: Very early loss (<5 weeks); hCG rises then falls.
• Recent Pregnancy: hCG persists 1–6 weeks after delivery, miscarriage, abortion.
• Medications: hCG trigger shots (fertility treatment), some antipsychotics, anticonvulsants.
• Test Error: Expired test, improper use, evaporation line misread.
• Medical Conditions: Ovarian cysts (rarely produce hCG), pituitary hCG (perimenopausal), renal failure (reduced clearance).

Next Steps

Repeat test in 48 hours (hCG should double in viable pregnancy). Confirm with quantitative serum β-hCG and transvaginal ultrasound. Consult OB/GYN.