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.

Test Details
Days Set Up
Monday - Saturday
Analytic Time

1 - 2 days

Soft Order Code
C2
MiChart Code
C2 Complement, Antigen
Synonyms
  • Complement C2
  • Second Component of Complement
  • FC4
  • FC3
  • C2 COMPLEMENT, FUNCT'L, SERUM
  • C2 FUNC
  • C2 INTERP
  • INTERPRETATION
Laboratory
Sendout
Reference Laboratory
Mayo C2 (81835)
Section
Special Testing
Specimen Requirements
Collection Instructions

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.

Special Handling

Place specimen on wet ice immediately following collection. Must arrive in lab or aliquot and freeze within 15 minutes.

Rejection Criteria
Hemolytic or thawed specimens are unacceptable.
Red Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum
Storage Temperature
Strict frozen
Additional Information

If C2 results are <15 U/mL, C3 (order code FC3, MML C3 8174), C4 (order code FC4, MML C4 8171) and C2 Antigen (order code C2AG, MML C2AG 84141) assays will be performed at an additional charge. By ordering this test the clinician acknowledges that additional reflex testing will be performed and billed at a separate additional charge if indicated. Test sent to Mayo Medical Laboratories.

Billing
CPT Code
86161
Fee Code
32063
Reflex CPT
C3 86160, C4 86160, C2AG 86160
LOINC
4484-2
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