Enter a value in IU/L and select the analyte to convert the concentration to mIU/mL. Because 1 IU/L = 1 mIU/mL, the numeric value stays exactly the same.
Quick Overview
When labs report hormones or similar assays in IU/L, the same result can be written as mIU/mL without changing the number.
- 1 IU = 1000 mIU
- 1 L = 1000 mL
- 1 IU/L = 1 mIU/mL
- 5 IU/L = 5 mIU/mL
- 10 IU/L = 10 mIU/mL
This identity is commonly used for tests such as TSH, hCG, LH, FSH, prolactin, insulin, and erythropoietin.
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IU/L to mIU/mL Formula
The following formula is used to convert IU/L to mIU/mL.
mIU/mL = IU/L
Equivalent unit relationships:
- 1 IU = 1000 mIU
- 1 L = 1000 mL
- 1 IU/L = (1000 mIU) / (1000 mL) = 1 mIU/mL
Because the factor of 1000 appears in both the numerator and denominator, the numerical value does not change during the conversion.
What is IU/L to mIU/mL Conversion?
Converting IU/L to mIU/mL is a unit restatement commonly used for hormone, antibody, and other laboratory results. IU means international units, while mIU means milli-international units. Since 1 IU equals 1000 mIU and 1 liter equals 1000 milliliters, the two unit expressions are numerically identical when used as concentrations.
That means a lab value reported as 2.5 IU/L is exactly the same concentration as 2.5 mIU/mL. Only the way the units are written changes.
This relationship is often encountered in endocrine and immunology testing, including TSH, hCG, LH, FSH, prolactin, insulin, and erythropoietin measurements.
IU/L to mIU/mL Conversion Table
The table below shows several common examples. In each case, the numeric value remains unchanged.
| Analyte | Example Result (IU/L) | Same Result (mIU/mL) |
|---|---|---|
| TSH | 2.0 IU/L | 2.0 mIU/mL |
| hCG | 150 IU/L | 150 mIU/mL |
| LH | 8 IU/L | 8 mIU/mL |
| FSH | 6 IU/L | 6 mIU/mL |
| Prolactin | 20 IU/L | 20 mIU/mL |
| Insulin | 15 IU/L | 15 mIU/mL |
| Erythropoietin | 10 IU/L | 10 mIU/mL |
Different laboratories may prefer IU/L or mIU/mL, but both formats describe the same concentration magnitude for these assays. Knowing that they are numerically equivalent makes it easier to compare reference ranges and published values.
How to Convert IU/L to mIU/mL?
The following steps outline how to convert IU/L to mIU/mL.
- First, determine the concentration reported in IU/L.
- Next, note that 1 IU equals 1000 mIU and 1 liter equals 1000 milliliters.
- Then apply the identity mIU/mL = IU/L.
- Finally, write the same numeric value using mIU/mL instead of IU/L.
- Check your answer with the calculator above.
Example Problem:
Use the following values as an example problem to test your knowledge.
Value = 10 IU/L
Converted Result = 10 mIU/mL
Since the units are numerically equivalent, the answer stays the same after conversion.