Complement C4a

Complement C4a des-Arginine

11 days

Radioimmunoassay (RIA)

Causes for Rejection:
No Futhan label added; non-Futhan label applied to tube; non-EDTA plasma; gross lipemia; gross hemolysis; turbid samples received.

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Activation marker of C4 complement. Elevated in immune activation.

Plasma (EDTA) with Futhan preservative

1 mL

Lavender-top (EDTA) tube

No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.

Collect EDTA whole blood sample into a chilled lavender-top tube. Immediately add Futhan preservative as directed in the Futhan collection kit. Recap lavender tube and invert several times to mix well. Centrifuge the whole blood specimen to separate the plasma. Transfer the plasma into the plastic screw-cap tube that is included in the collection kit. The specimen must be submitted in this transfer tube, which is labeled with the words "Futhan Added." Freeze immediately and maintain frozen until tested. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Special Instructions:
Futhan preservative must be added to samples immediately after collection.