Tumor markers

CEA unit converter

Carcinoembryonic antigen (tumor marker, mainly colorectal)

Also known as: Carcinoembryonic antigen, Karzinoembryonales Antigen, ACE, Antigène carcino-embryonnaire, Antígeno carcinoembrionario, Antigene carcinoembrionario

Converter

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

ng/mL µg/dL ng/dL ng/L

Worked example

1.25 ng/mL (middle of the reference range) = 0.125 µg/dL

Conversion formulas

µg/dL	µg/dL = ng/mL × 0.1	ng/mL = µg/dL × 10
ng/dL	ng/dL = ng/mL × 100	ng/mL = ng/dL × 0.01
ng/L	ng/L = ng/mL × 1000	ng/mL = ng/L × 0.001

Reference range

Unit	Adults
ng/mL	0 – 2.5
µg/dL	0 – 0.25
ng/dL	0 – 250
ng/L	0 – 2500

Source: MedlinePlus (NLM): CEA blood test · Last reviewed: 2026-10-14

Note from the source: 0-2.5 ng/mL; in smokers up to 5 ng/mL may be normal (MedlinePlus)

Frequently asked questions

How do I convert CEA from ng/mL to µg/dL?

µg/dL = ng/mL × 0.1. In the other direction: ng/mL = µg/dL × 10.

What is the reference range of CEA?

For adults the range is 0 – 2.5 ng/mL (MedlinePlus (NLM): CEA blood test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for CEA?

Common units are ng/mL, µg/dL, ng/dL, ng/L.