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Alias Names: RVVT
Methodology: Mechanical Clot Timer
Edit Date: 6/7/2008
Performed: Monday, Thursday
Released: Weekly
CPT Code: 85613
Specimen Collection Details
Collection: One 4.5 light blue top tube (sodium citrate). Collect by careful venipuncture to avoid tissue contamination or hemolysis. Do not use needles smaller than 23 gauge. Fill to maximum draw, at least 90% full. Mix by gentle inversion. Call PeaceHealth Laboratoires Special Coagulation Department (541.687.2134 x4612) when urgent testing is needed in order to assure STAT testing.
Handling: Due to short stability, specimen must either be sent STAT to arrive in laboratory within 4 hours, or sent frozen. For STAT, refrigerate and keep capped in original tube. Call for STAT pick-up. For standard delivery, centrifuge to produce platelet poor plasma (at least 1700 X G for 15 minutes), and using a plastic pipette, transfer the top 2/3 of the plasma into a plastic vial. Label with patient name, I.D. number, test, and “citrated plasma.” Freeze immediately. Send to PeaceHealth Laboratories within 7 days. If multiple tests are ordered, freeze a separate aliquot for this test.
Stability: 4 hours ambient or refrigerated, or 7 days frozen.
Standard Volume: 4.5 mL whole blood or 1 mL plasma.
Minimum Volume: 1.8 mL whole blood or 0.5 mL plasma.
Transport: Original tubes refrigerated if STAT, or plasma frozen on dry ice in a Styrofoam container.
Comments: The RVVT is affected by coumadin and heparin. Do not order for lupus inhibitor screening on patients who are taking either medication. See also: Coagulation Study, Anti-Phospholipid Panel (25620).
Rejection Criteria: Visible fibrin; moderate to marked hemolysis; specimen received in laboratory beyond stated stability.

Varies with reagent lot number. Current reference range included with report.

PeaceHealth Laboratories