Complement Component 4A
2003180
 
Ordering Recommendation
Follow-up test for complement activity screening when CH50 is low or absent and AH50 is normal and high suspicion remains for complement deficiency.
Mnemonic
COMP 4A
Methodology
Radioimmunoassay
Performed
Varies
Reported
21-31 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
 
Collect
Lavender (EDTA).  
Specimen Preparation
Separate from cells within 1 hour of draw. Transfer 1 mL plasma to an ARUP Standard Transport Tube. Freeze at -70°C or on dry ice immediately. (Min: 1 mL)  
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.  
Unacceptable Conditions
Refrigerated or room temperature specimens.  
Remarks
 
Stability
Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: Frozen at -70°C: 1 year  
Reference Interval
By report
Interpretive Data
Note
CPT Code(s)
86160
Components
Component Test Code*Component Chart Name
2003181Complement Component 4A
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, contact interface support at interface.support@aruplab.com.
Cross References
Performed at National Jewish