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Alphabetical Index
C4, Serum (8000100173)
Test Mnemonic:

C4
Specimen Requirements:
Collection:

7 mL of blood in SST or red-topped vacutainer tube.  
Minimum Volume:

3mL
Storage/Transport:

Delivered to Sample Management within 2 hours of collection.
Stability:

Room temperature for ≤ 6 hours; Refrigerator for ≤ 24 hours; Frozen for ≤ 7 days. (Avoid repeated freeze/thaw cycles).         
Causes for Rejection:

Incomplete and/or incorrect sample identification, improper storage/transport and gross hemolysis or lipemia.                                
Specimen Preparation:

Allow specimen to clot completely at room temperature. Centrifuge to separate serum from cells within 2 hours of collection. Transfer serum from collection tube to labeled plastic transport tube. 
Methodology:

Nephelometric 
Performed:

Special Chemistry;    

Monday - Sunday: 7 am - 3:00 pm

                                        
Turnaround Time:

Monday - Sunday: 7 am - 3:00 pm
Reference Range:

By report (reports may vary based on instrumentation, patient age and sex).
CPT 4 Code:

86161
Note:

Director approval required for STAT requests.
Effective Date: 10/16/2014
Reviewed By/Date: Okorodudu, Anthony - 11/21/2018
Approved By/Date: Okorodudu, Anthony - 12/20/2022
When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.

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