Complement Component 4A

Abbrev Code:COMP4A   
Order Code:LAB6697Order Name:Complement Component Level 4A
Synonyms:COMP-4A; C4A
CPT Codes: 86160 x1, 86160 x1
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 18 days.

Collection Instructions

Optimal Volume:2 mL
Minimum\Peds Volume:1.2 mL
Container:Purple (EDTA)
Causes for Rejection:Room temperature or refrigerated specimens.

Processing and Shipping

Specimen Processing:Centrifuge and aliquot within 1 hour of collection, 1 mL, 0.5 mL minimum. Freeze at -70° C or on dry ice immediately. CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Shipping Instructions:Ship on dry ice.
Stability:Stable for 1 year if stored at -70°C.
Test Performed at or Referral Lab Lab Sendouts  (National Jewish Health)
Referral Lab number:C4AR


Reference Range:0-2830 ng/mL
Use:Follow-up test for complement activity screening when CH50 is low or absent and AH50 is normal and high suspicion remains for complement deficiency.

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