Printed on 3/17/2026
For informational purposes only. This is not medical advice.
Laboratory values are reported in different units depending on the country: conventional units are standard in the US, while SI (Système International) units are used in most other countries and in scientific literature. This converter handles 20 commonly tested lab values, allowing quick conversion between the two systems. After converting creatinine values, calculate [eGFR Calculator](/tools/egfr-calculator) or [Creatinine Clearance](/tools/creatinine-clearance) for kidney function. For calcium conversions, use in [Corrected Calcium Calculator](/tools/corrected-calcium). For bilirubin and albumin, apply results to [Child-Pugh Score](/tools/child-pugh) or [MELD Score](/tools/meld-score).
Formula: SI value = Conventional value × Conversion factor
Your converted value represents the same laboratory measurement expressed in the alternative unit system. The conversion is based on the molecular weight of the analyte and standard conversion factors used in clinical chemistry. Conventional units (used primarily in the US) and SI units (used internationally and in scientific literature) measure the same quantity but express it differently.
When interpreting your converted result, always compare it to the appropriate reference range for the unit system you are converting to. Reference ranges are unit-specific, and a value that appears normal in one system may look alarming if mistakenly compared to a reference range in the other system. For example, a glucose of 100 mg/dL is normal, but the equivalent 5.6 mmol/L should be compared against SI reference ranges, not conventional ones.
Use this converter when reading medical literature, research papers, or clinical guidelines that report laboratory values in a different unit system than what your local laboratory uses. It is particularly important when consulting international guidelines or studies, as most non-US publications use SI units while US laboratories report in conventional units.
It is also useful when caring for patients who have laboratory results from another country, when communicating with international colleagues, or when entering data into research databases that require a specific unit format. Pharmacists and researchers frequently need these conversions for drug dosing studies and pharmacokinetic calculations.
While most conversion factors are precise and based on well-established molecular weights, some analytes have approximate conversion factors due to variable molecular composition. Proteins such as albumin and immunoglobulins have conversions based on average molecular weights that may not be exact for every clinical scenario.
This tool converts between the two most common unit systems but does not cover all possible units for every analyte. Some specialized tests may use unique units not included here. Additionally, the tool does not adjust reference ranges during conversion. You must look up the appropriate reference range for the target unit system independently.
Unit conversion errors are a recognized source of medical errors, particularly for glucose and creatinine. Always double-check converted values against known clinical ranges and verify the conversion direction before making clinical decisions based on converted results.
For related assessments, see Anion Gap, Corrected Calcium and eGFR Calculator.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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