C4 Activation Panel

Test Code

35071

CPT Codes
83520, 86160

Includes

Complement Component C4c
C4d Fragment, EIA

Preferred Specimen

1 mL serum and 1 mL plasma collected in an EDTA (lavender-top) tube

Minimum Volume

0.5 mL each specimen

Transport Container

Transport tube

Transport Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: 4 hours
Frozen: 14 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Hemolysis • Received room temperature • Received refrigerated

Methodology
See individual tests

FDA Status
C4d Fragment, EIA: This test was performed using a kit that has not been cleared or approved by the FDA. The analytical performance characteristics of this test have been determined by Quest Diagnostics. This test should not be used for diagnosis without confirmation by other medically established means.

Reference Range

See individual tests

Performing Laboratory

Quest Diagnostics Nichols Institute-San Juan Capistrano, CA

33608 Ortega Highway

San Juan Capistrano, CA 92675-2042

Last Updated: November 6, 2024

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.