Browse Medical Laboratory Calculators
Immunoglobulin M (IgM) Unit Converter
Immunoglobulin M (IgM) is the largest antibody class, typically existing as a pentamer (five monomers joined together). It is the first antibody produced by the body in response to initial exposure to an antigen, forming the core of the immediate immune response.
Clinically, elevated IgM levels primarily indicate recent or active infection, as it drives the primary immune response. It is also used to diagnose certain B-cell lymphoproliferative disorders, such as Waldenström’s Macroglobulinemia (a form of monoclonal gammopathy). Low levels suggest primary or secondary immunodeficiency. This converter facilitates switching between the SI standard (g/L) and the conventional mass unit (mg/dL).
SI Units
RecommendedGrams per liter or Micromoles per liter.
Conventional Units
Clinical Context
Reference Range (Adults): Typically 40–230 mg/dL (0.4–2.3 g/L).
IgM is measured to detect the stage of infection; elevated levels indicate a recent or active antigenic challenge. Markedly high monoclonal IgM may signal Waldenström’s Macroglobulinemia. The molar conversion relies on MW 900,000 g/mol: 1 g/L ≈ 1.11 µmol/L.
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., g/L). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other units (like mg/dL and µmol/L) are instantly updated.
Verify Units
Check the SI Units section. Note that g/L is the primary SI unit for immunoglobulins.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. mg/dL and mg% are numerically identical.
IgM is typically found in a pentameric structure, meaning five basic Y-shaped antibody units are joined together, giving it a high molecular weight.