uIU/mL to mIU/L Converter
Instantly convert micro International Units per milliliter to milli International Units per liter for accurate, stress-free medical lab result interpretation.
Convert Your Lab Results
Enter your laboratory value in micro International Units per milliliter (uIU/mL). The calculator instantly provides the equivalent in milli International Units per liter (mIU/L) and International Units per liter (IU/L).
Unit Converter
Translate your medical lab values accurately and instantly.
Understanding the Units
Key factors about medical concentration measurements
The 1:1 Ratio
Because “micro” is 1/1,000 of a “milli”, and a “milliliter” is 1/1,000 of a “liter”, the fractions cancel out perfectly. 1 uIU/mL = 1 mIU/L.
Common Tests
This conversion is frequently used for Thyroid Stimulating Hormone (TSH), human Chorionic Gonadotropin (hCG), insulin, and various antibody tests.
Scaling to IU/L
If your reference range is in standard International Units per liter (IU/L), simply divide the uIU/mL value by 1,000 to get the correct figure.
Lab Variations
Different laboratories and assay manufacturers may default to different units. Knowing they are numerically identical prevents unnecessary confusion.
Unit Conversion Equivalents
Common conversion benchmarks to help you quickly interpret laboratory reporting standards.
| Input (uIU/mL) | Output (mIU/L) | Output (IU/L) | Common Application |
|---|---|---|---|
| 1.0 uIU/mL | 1.0 mIU/L | 0.001 IU/L | Low-range TSH or Insulin |
| 5.0 uIU/mL | 5.0 mIU/L | 0.005 IU/L | Standard TSH reference range |
| 25.0 uIU/mL | 25.0 mIU/L | 0.025 IU/L | Elevated hormone markers |
| 100.0 uIU/mL | 100.0 mIU/L | 0.100 IU/L | hCG or specific antibody tests |
| 1,000.0 uIU/mL | 1,000.0 mIU/L | 1.000 IU/L | High-concentration biomarkers |
Unit Converter FAQ
Answers to the most frequently asked questions about medical laboratory unit conversions.
There is no numerical difference. 1 micro International Unit per milliliter (uIU/mL) is exactly equal to 1 milli International Unit per liter (mIU/L). Because a micro unit is 1/1,000th of a milli unit, and a milliliter is 1/1,000th of a liter, the ratios cancel out perfectly, resulting in a 1:1 conversion.
To convert uIU/mL to standard International Units per liter (IU/L), you divide the value by 1,000. For example, a result of 500 uIU/mL is equivalent to 0.5 IU/L.
Laboratories may use different reporting standards based on regional conventions, the specific assay manufacturer’s default settings, or historical practices. Common tests like TSH, hCG, and insulin are frequently reported in either uIU/mL or mIU/L depending on the lab.
This tool provides mathematically accurate unit conversions. However, it is for educational and informational purposes only. Always consult your healthcare provider or a qualified medical professional for the interpretation of lab results, reference ranges, and any medical diagnoses.
Yes, the same 1:1 mathematical principle applies in reverse. 1 mIU/mL is exactly equal to 1 uIU/L, as the “milli” to “micro” step (x1,000) is perfectly offset by the “milliliter” to “liter” step (÷1,000).