Positive Pregnancy Test in Men: Causes and Meaning

Men cannot become pregnant. A positive pregnancy test in a male indicates the presence of hCG (human chorionic gonadotropin) — which is not normal and requires medical investigation.

Causes of hCG in Males

• Germ cell tumors (testicular cancer): Especially choriocarcinoma, embryonal carcinoma, seminoma — syncytiotrophoblastic cells secrete hCG. This IS a marker for testicular cancer.
• Other malignancies: Lung, gastric, hepatic, pancreatic cancers (ectopic hCG production).
• Pituitary hCG: Low-level hCG from pituitary (LH cross-reactivity) — more common in older men; usually <5 mIU/mL.
• Medications: hCG injections (fertility, weight loss "hCG diet"), anabolic steroids (cross-reactivity).
• Marijuana: Some reports of interference (unclear mechanism).
• Assay interference: Heterophilic antibodies, rheumatoid factor (rare).

Critical Action

1. Do NOT assume false positive.
2. See a physician immediately. Urologist or primary care.
3. Workup: Serum quantitative β-hCG, testicular ultrasound, LDH, AFP, CXR, CT if indicated.
4. Testicular self-exam: Monthly; any lump = urgent urology.

Key Correction

The original statement "Testicular cancers... usually don't involve positive pregnancy test" is incorrect and dangerous. hCG is a standard tumor marker for nonseminomatous germ cell tumors. A positive pregnancy test in a male must be evaluated for testicular cancer.