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Human Chorionic Gonadotropin (hCG) Unit Converter
Human Chorionic Gonadotropin (hCG) is a hormone produced by the cells that form the placenta during pregnancy. It is essential for maintaining the corpus luteum and stimulating it to produce progesterone, which is critical for supporting the early pregnancy.
Clinically, total hCG is measured to confirm and date pregnancy (levels typically double every 48–72 hours in early pregnancy). It is also monitored in oncology as a marker for certain germ cell tumors (testicular cancer, ovarian tumors) and gestational trophoblastic disease. Results are universally reported in International Units (mIU/mL or IU/L).
SI / Activity Units
RecommendedMilli-International Units per milliliter (Numerically 1:1).
Other Units
Clinical Context
Reference Ranges:
• Non-Pregnant Women: < 5 mIU/mL
• Pregnancy (5 Weeks): ≈ 18 – 7,340 mIU/mL
In early pregnancy, monitoring the hCG doubling time is crucial; if levels do not increase by at least 66% in 48 hours, it suggests a nonviable pregnancy or ectopic pregnancy. In oncology, elevated hCG serves as a therapeutic marker for certain germ cell tumors. The relationship 1 mIU/mL = 1 IU/L is based on standard metric conventions.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., mIU/mL). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. Conversions are linear across all activity units.
Verify Units
Check the SI Units section. IU/L and mIU/mL should always match numerically.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. The units cancel out: 1 mIU/mL = 1 IU/L.
Hormones like hCG are glycoproteins. Measuring biological activity (IU) is more clinically reliable than measuring mass (ng/mL), as the mass can vary due to differences in glycosylation.