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Test ID FC4AL C4 Level by RIA

Specimen Required

Container/Tube: Lavender top tube

Preferred: Lavender top tube

Acceptable: Lavender top tube

Specimen Volume: 2 mL

Collection Instructions: Draw blood in a lavender top (EDTA) tubes(s), plasma gel tube(s) is not acceptable. Mix well, centrifuge at room temperature within one half hour of draw (preferable immediately after venipuncture) and freeze immediately on dry ice or at -70 C. Send 1 mL of EDTA plasma frozen in plastic vial.


Complete and submit with specimen:

1. National Jewish Complement request form

Method Name

Radioimmunoassay (RIA)

Reporting Name

C4a Level

Specimen Type

Plasma EDTA

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma EDTA Frozen 365 days

Reference Values

0 - 2830 ng/mL

Performing Laboratory

National Jewish Health

Test Classification

This test uses a kit/reagent designated by the manufacturer as for research use, not for clinical use. The performance characteristics for this test have been validated by National Jewish Health. It has not been cleared or approved by the U.S. Food and Drug Administration. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions. This laboratory is certified under the Clinical Laboratory Improvement Amendments of 1988 (CLIA-88) as qualified to perform high complexity clinival laboratory testing.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FC4AL C4a Level Not Provided


Result ID Test Result Name Result LOINC Value
FC4AL C4a Level Not Provided

Day(s) Performed

Monday through Friday

Report Available

20 to 44 days