C4, Serum (087-0283)

Synonyms: Complement Component C4, Fourth Component of complement

CPT 4 CODE: 86161

Test Order Mnemonic: C4

Lab: Clinical Chemistry

Request Form: Special Chemistry Form 2.

Collection: Routine Venipuncture.

Storage Instructions: Prefer prompt delivery.   Centrifuge the specimen to separate the serum from red cells and refrigerate 2-8°C for up to 7 days, -20°C for longer storage.

Causes for Rejection: Gross hemolysis, lipemia, insufficient volume, sample not labeled appropriately.

Availability: Samples are received 24 hrs per day at Sample Management, Room 5.136 McCullough.

Turnaround Time: Routine: 24 hrs; test performed 8AM - 5PM Monday - Friday.

Specimen: Blood

Volume: 7 mL blood; Pediatric - 1 mL

Minimum Volume: 3 mL blood or 0.5mL of serum.

Container: Preferred: SST (gel barrier tube); acceptable:  Red-topped tube

Reference Ranges:

Cord Blood: 6.6-23.0 mg/dL	1 month: 7.0-25.0 mg/dL	2 months: 7.4-28.0mg/dL
3 months:  8.7-27.0 mg/dL	4 months: 8.3-38.0 mg/dL	5 months: 7.1-36.0 mg/dL
6 months:  8.6-42.0 mg/dL	7-9 months: 9.5-37.0 mg/dL	10-12 months:2.0-39.0 mg/dL
1 year:  12.0-40.0 mg/dL	2 years: 9.2-34.0 mg/dL	3 years: 9.7-36.0  mg/dL
4-5 years: 13.0-32.0 mg/dL	6-8 years: 12-32 mg/dL	9-10 years:10-40 mg/dL
Adult: 15-45 mg/dL

Test Method: Nephelometric

Reviewed/revised April 2007 by P. Harris