Immunology & cytokines

C1 esterase inhibitor (antigen) unit converter

C1 inhibitor protein level (hereditary angioedema)

Also known as: C1-INH, C1 inhibitor, C1-Inhibitor

Converter

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

g/L mg/dL mg/L

Worked example

295 mg/L (middle of the reference range) = 29.5 mg/dL

Conversion formulas

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

Good to know

C1 esterase inhibitor (antigen) is reported in mg/L or mg/dL. The page converts between the units only.

mg/dL × 10 = mg/L (exact factor 10).
The range shown is a guide from the named source; targets and reference ranges differ between laboratories, methods and indications, so compare with the range on your own report.

Reference range

Unit	Adults
g/L	0.21 – 0.38
mg/dL	21 – 38
mg/L	210 – 380

Source: Severn Pathology (North Bristol NHS Trust): C1 Esterase Inhibitor · Last reviewed: 2026-10-19

Note from the source: Immunochemical 0.21-0.38 g/L (210-380 mg/L); functional activity above 70 % (Severn Pathology). Always read together with the functional test

Frequently asked questions

How do I convert C1 esterase inhibitor (antigen) from mg/L to mg/dL?

mg/dL = mg/L × 0.1. In the other direction: mg/L = mg/dL × 10.

What is the reference range of C1 esterase inhibitor (antigen)?

For adults the range is 210 – 380 mg/L (Severn Pathology (North Bristol NHS Trust): C1 Esterase Inhibitor). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for C1 esterase inhibitor (antigen)?

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