81241, 85303, 85300, 85306
Thrombosis, Venous Risk Profile
Plasma, frozen and serum, refrigerated, and whole blood or buccal swab kit (Buccal swab collection kit contains instructions for the use of a buccal swab.)
6 mL frozen plasma (3 mL in each of two tubes) and 2 mL serum and 7 mL whole blood or buccal swab kit
Minimum: 3 mL frozen plasma and 0.5 mL serum and 3 mL whole blood or two buccal swabs
Blue-top (sodium citrate) tube, gel-barrier tube, lavender-top (EDTA) tube, yellow-top (ACD) tube, or buccal swab kit
Do not draw from an arm with a heparin lock or heparinized catheter.
Citrated plasma samples should be collected by double centrifugation. The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. When noncitrate tubes are collected for other tests, collect sterile and nonadditive (red-top) tubes prior to citrate (blue-top) tubes. Any tube containing an alternate anticoagulant should be collected after the blue-top tube. Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Centrifuge for 10 minutes and carefully remove 2/3 of the plasma using a plastic transfer pipette, being careful not to disturb the cells. Deliver to a plastic transport tube, cap, and recentrifuge for 10 minutes. Use a second plastic pipette to remove the plasma, staying clear of the platelets at the bottom of the tube. Transfer the plasma into a frozen purple tube with screw cap. 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.
Freeze plasma. Refrigerate serum. Maintain whole blood and buccal swab kit at room temperature or refrigerate.