C4a Level


  • EPIC Code:
  • MISC
  • Soft Test Code:
  • MSOT
  • Send Out Test Code:
  • C4AR
Alternate Names
  • C4a anaphylatoxin
  • C4a complement, RIA
  • C4a des Arg Level
  • C4ades Arg Level
  • C4AL
  • Complement Component 4A
  • Radial Immuno Assay (C4a Level)

Specimen Collection & Preparation

Client Notes:

If your site does not have dry ice or a -70 freezer on site please contact the laboratory at 266-1500 (Option 1) and request dry ice for before collected 
send the patient to the Outpatient Service Center at 11141Parkview Plaza Drive,Suite100 Fort Wayne, IN Entrance 3. for collection.

Specimen Requirements

1.0 mL Frozen Plasma from a Lavender Top Tube - EDTA in a Plastic Vial 

Pediatric Volume: 500 uL Frozen Plasma from a Lavender Top Tube - EDTA in a Plastic Vial 

Alternate Specimen



Frozen -70° C: 1 year
 (Freeze & Transport in Dry Ice)


Collection Instructions

Due to specimen required temperature this test must be drawn at the Parkview OSC Lab 

Mix by inverting tube 8 times
Centrifuge at room temperature within one half hour of collection; preferably immediately after venipuncture. 
Transfer the cell-free plasma to a clean tube and immediately freeze on dry ice or at -70° C.

Separate specimens must be submitted when multiple tests are ordered

Clinical Interpretation

Reference Range:

Human Male: 0-2830 ng/mL
Human Female: 0-2830 ng/mL

  • Radioimmunoassay (RIA)


This test uses a kit/reagent designated by the manufacturer as "for research use, not for clinical use". The performance characteristics of this test have been validated by National Jewish Clinical Reference Laboratories. It has not been cleared or approved by the US 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 clinical laboratory testing.

Production Schedule

Sites Performed
  • National Jewish Health
Days Performed
  • Sendouts - Miscellaneous
Turn Around Time

21 to 22 days (1st and 3rd Thur of the month)

Coding & Compliance



CPT Coding