Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

CH50

General Information

Lab Order Codes:

CH5

Synonyms:

Complement, Total; Complement, Total Hemolytic

CPT Codes:

86162 – Complement; total hemolytic (CH50)

Test Includes:

Total complement level reported in U/mL.

Logistics

Test Indications:

Useful for detection of individuals with on ongoing immune process or congenital complement deficiencies.

Lab Testing Sections:

Chemistry - Sendouts

Referred to:

Mayo Medical Laboratories (MML Test: 8167/COM)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 – 2 days, test set up Monday - Saturday

Special Instructions:

See Collection. See Patient Preparation.

Specimen

Specimen Type:

Whole blood

Container:

Red top tube (plain, no gel)

Draw Volume:

3 mL (Minimum: 1.5 mL) blood

Processed Volume:

1 mL (Minimum: 0.5 mL) serum

Collection:

Routine venipuncture, immediately place specimen on wet ice and transport to lab for processing.

Special Processing:

Lab Staff: Centrifuge specimen, remove serum aliquot into a screw-capped round bottom plastic vial. Store and ship at frozen temperatures. Forward promptly.

Patient Preparation:

Fasting specimens preferred.

Sample Rejection:

Warm specimens, mislabeled or unlabeled specimens

Interpretive

Reference Range:

≥16 years:

30 – 75 U/mL

Interpretation: Low levels of complement (total hemolytic complement: CH50) may occur during infections, disease exacerbation in patients with systemic lupus erythematosus, and in patients with immune complex diseases such as glomerulonephritis.

Undetectable levels suggest the possibility of a complement component deficiency. Individual complement component assays are useful to identify the specific deficiency.

Critical Values:

N/A

Limitations:

Because this is a functional assay, the results are dependant on appropriate specimen transport and storage.

Methodology:

Automated Liposome Lysis Assay

References:

Mayo Medical Laboratories July 2013



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