Days Set Up
Monday - Saturday
Analytic Time

1 - 2 days

MiChart Code
C2 Complement, Antigen
Soft Order Code
C2

Test Updated:

Synonyms

Complement C2
Second Component of Complement
FC4
FC3
C2 COMPLEMENT, FUNCT'L, SERUM
C2 FUNC
C2 INTERP
INTERPRETATION

Looking to order a test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

C2H(50) Automated Liposome Lysis Assay

Test Usage

Investigating an undetectable total complement (CH50) level. Investigation of patients with acquired ongoing immune processes such as lupus erythematosus. Differentiation of congenital from acquired deficiencies.

Reference Range

25 - 47 unit/mL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

A fasting specimen is preferred but not required. Collect blood in a red top tube. Immediately after drawing specimen, place the tube on wet ice. Centrifuge, aliquot serum into a plastic vial and freeze immediately.

Red Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum

Billing Information

CPT Code
86161
Pro Fee Code
 
LOINC
4484-2

Have More Questions?

Explore our helpful billing resources:

Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.