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Category Medicine & Tests

⚠️ Medical Disclaimmer: Conversion factors vary by assay kit. Always verify with your lab director.

Select Analyte / Hormone

Input Value (ng/mL)

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About

In reproductive medicine and endocrinology, precision in unit conversion is critical for diagnosis and treatment planning. This tool converts ng/mL to mIU/mL (milli-International Units per milliliter). Unlike the liter-based measurements, this specific conversion is often found in fertility clinics (IVF) and specific immunoassay outputs.

Different proteins and hormones have vastly different conversion factors based on their molecular weight and biological purity defined by WHO International Standards. For instance, Prolactin requires significant adjustment, whereas other hormones may have a near 1:1 ratio depending on the reference preparation used. This calculator enforces the selection of a specific biological marker to prevent the dangerous application of generic formulas to sensitive medical data.

Formulas

To convert from mass concentration to volume-based activity, the formula uses a specific coefficient k derived from the WHO standard activity per milligram, adjusted for the volume unit:

C_mIU/mL = C_ng/mL × k

For example, Prolactin typically converts at roughly 21.2 mIU/L per 1 ng/mL. To get mIU/mL, we divide the factor by 1000:

k_prolactin = 21.21000 = 0.0212

Reference Data

Analyte	Reference Standard	Formula Factor (x)	Example Conversion (10 ng/mL)
hCG (Human Chorionic Gonadotropin)	WHO 4th IS	5.0	50 mIU/mL
LH (Luteinizing Hormone)	WHO 2nd IS 80/552	1.0 (Approx)	10 mIU/mL
FSH (Follicle Stimulating)	WHO 2nd IRP	1.0 - 1.5	~12 mIU/mL
Prolactin	WHO 3rd IS 84/500	0.0212	0.212 mIU/mL
TSH	WHO 2nd IRP	0.006	0.06 mIU/mL
Insulin	WHO 66/304	0.0287	0.287 mIU/mL

Frequently Asked Questions

Prolactin is often reported in mIU/L (liters) or ng/mL. When converting to mIU/mL (milliliters), you must account for the volume difference (1000 mL = 1 L). Therefore, a factor of 21.2 for liters becomes 0.0212 for milliliters.

These factors represent international standards. However, every specific assay kit (e.g., Roche, Abbott, Siemens) has its own calibration. Always verify the conversion factor on the package insert of the specific kit used for the blood test.

Generally, no. Steroid hormones like Testosterone are usually measured in ng/dL, ng/mL, or nmol/L (molar units). They are rarely measured in "International Units" (IU) which are reserved for proteins with biological activity like hCG or Insulin.