Proteins & inflammation

IgM unit converter

First antibody type produced in an infection

Also known as: Immunoglobulin M, Immunglobulin M, Immunoglobuline M, Inmunoglobulina M, Immunoglobulina M, Imunoglobulina M

Converter

Enter a value in any unit and all other units fill in.

g/L mg/dL g/dL mg/L

Worked example

1.35 g/L (middle of the reference range) = 135 mg/dL

Conversion formulas

mg/dL	mg/dL = g/L × 100	g/L = mg/dL × 0.01
g/dL	g/dL = g/L × 0.1	g/L = g/dL × 10
mg/L	mg/L = g/L × 1000	g/L = mg/L × 0.001

Reference range

Unit	Adults
g/L	0.4 – 2.3
mg/dL	40 – 230
g/dL	0.04 – 0.23
mg/L	400 – 2300

Source: MedlinePlus (NLM): Quantitative immunoglobulins · Last reviewed: 2026-10-14

Note from the source: 40-230 mg/dL (0.4-2.3 g/L) (MedlinePlus)

Frequently asked questions

How do I convert IgM from g/L to mg/dL?

mg/dL = g/L × 100. In the other direction: g/L = mg/dL × 0.01.

What is the reference range of IgM?

For adults the range is 0.4 – 2.3 g/L (MedlinePlus (NLM): Quantitative immunoglobulins). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for IgM?

Common units are g/L, mg/dL, g/dL, mg/L.