CPT Code: 86160
Order Code: 353
ABN Requirement: No
Specimen: Serum
Volume: 1.0 mL
Minimum Volume: 0.5 mL
Container: Gel-barrier tube (SST, Tiger Top)
Collection:
- Collect and label sample according to standard protocols.
- Gently invert tube 5 times immediately after draw. DO NOT SHAKE.
- Allow blood to clot 30 minutes.
- Centrifuge for 10 minutes.
Transport: Store serum at 2°C to 8°C after collection and ship the same day per packaging instructions included with the provided shipping box.
Stability:
Ambient (15-25°C): Not Acceptable
Refrigerated (2-8°C): 4 days
Frozen (-20°C): 21 days
Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits
Methodology: Immunoturbidimetric
Turn Around Time: 2 to 3 days
Reference Range:
| Age | Male | Female |
| <1 Year | Not established | Not established |
| 1-14 Years | 14-44 mg/dL | 13-46 mg/dL |
| 15-80 Years | 15-53 mg/dL | 15-57 mg/dL |
| ≥81 Years | Not established | Not established |
Clinical Significance: Decreased C4 level is associated with acute systemic lupus erythematosis, glomerulonephritis, immune complex disease, cryoglobulinemia, congenital C4 deficiency and generalized autoimmune disease.
The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.