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Complement Component 4
0050155
Ordering Recommendation

May assist in ruling out a complement deficiency.

Mnemonic
C4
Methodology
Quantitative Immunoturbidimetry
Performed
Sun-Sat
Reported
Within 24 hours
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
 
Collect
Serum separator tube. Also acceptable: Lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin). 
Specimen Preparation
Allow specimen to clot at room temperature. Separate serum from cells ASAP or within 2 hours of collection and freeze. Transport 0.5 mL serum. (Min: 0.3 mL) 
Storage/Transport Temperature
Frozen. 
Unacceptable Conditions
Specimens left to clot at refrigerated temperature. Specimens exposed to repeated freeze/thaw cycles. 
Remarks
 
Stability
Ambient: 48 hours; Refrigerated: 48 hours; Frozen: 2 weeks (avoid repeated freeze/thaw cycles) 
Reference Interval
0-30 days: 8-30 mg/dL
1 month: 9-33 mg/dL
2 months: 9-37 mg/dL
3 months: 10-35 mg/dL
4 months: 10-49 mg/dL
5 months: 9-48 mg/dL
6 months: 12-55 mg/dL
7-8 months: 13-48 mg/dL
9-11 months: 16-51 mg/dL
1 year: 16-52 mg/dL
2-4 years: 12-47 mg/dL
5-11 years: 13-44 mg/dL
12-17 years: 14-41 mg/dL
18 years and older: 10-40 mg/dL

Interpretive Data


Note
CPT Code(s)
86160
Components
Component Test Code*Component Chart NameLOINC
0050155Complement Component 44498-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • 4th Component of Complement, Serum
  • C4
  • C4 Complement Serum
  • C4, Serum
  • Complement C4, Serum
  • Fourth Component of Complement