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Test Code FC4AL C4 Level by RIA


Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Container/Tube: Lavender top (plasma gel tubes are not acceptable)

Submission Container/Tube: Plastic vial

Specimen Volume: 1.5 mL Plasma

Collection Instructions:

1. Mix well.

2. Within 30 minutes of collection centrifuge at 1600 (±200) x g (rcf) at 4° C for 15 minutes.

3. Aliquot 1.5 mL of plasma into a plastic vial.

4. Freeze plasma immediately at -20° C for up to 4 weeks or, ideally, at -60° C or below for up to 1 year.

5. Send frozen.


Method Name

Radioimmunoassay (RIA)

Reporting Name

C4a Level

Specimen Type

Plasma EDTA

Specimen Minimum Volume

Plasma: 0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Plasma EDTA Frozen 365 days

Reject Due To

Gross hemolysis Reject

Reference Values

0-2830 ng/mL

Performing Laboratory

National Jewish Health

CPT Code Information

86160

Day(s) Performed

Monday through Friday

Report Available

9 to 14 days