Thrombotic Risk Profile II

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Category:

Turnaround Time: 5 - 8 days
CPT Code:

81240; 83090; 85300; 85303; 85306; 85307; 85420; 85613; 85705; 85732; 86146(x3); 86147(x3); 86148(x3); 86849

Overview:

Evaluate for the presence of hereditary or acquired factors that may increase the risk for developing venous thrombosis.


1. Adcock DM, Kressin DC, Marlar RA. Effect of 3.2% vs 3.8% sodium citrate concentration on routine coagulation testing. Am J Clin Pathol. 1997 Jan; 107(1):105-110. PubMed 8980376

2. Reneke J, Etzell J, Leslie S, Ng VL, Gottfried EL. Prolonged prothrombin time and activated partial thromboplastin due to underfilled specimen tubes with 109 mmol/L (3.2%) citrate anticoagulant. Am J Clin Pathol. 1998 Jun; 109(6):754-757. PubMed 9620035

3. National Committee for Clinical Laboratory Standardization. Collection, Transport, and Processing of Blood Specimens for Coagulation Testing and General Performance of Coagulation Assays; Approved Guideline. 5th ed. Villanova, Pa: NCCLS; 2008. Document H21-A5:28(5).

4. Gottfried EL, Adachi MM. Prothrombin time and activated partial thromboplastin time can be performed on the first tube. Am J Clin Pathol.1997 Jun; 107(6):681-683. PubMed 9169665

5. McGlasson DL, More L, Best HA, Norris WL, Doe RH, Ray H. Drawing specimens for coagulation testing: Is a second tube necessary? Clin Lab Sci. 1999 May-Jun; 12(3):137-139. PubMed 10539100

Alving BM. The antiphospholipid syndrome: Clinical presentation, diagnosis and patient management. In: Kitchens CS, Alving BM, Kessler CM, eds. Consultative Hemostasis and Thrombosis. Philadelphia, Pa. WB Saunders Co; 2002:181-196.

Schafer Al, Levine MN, Konkle BA, Kearon C. Thrombotic disorder: Diagnosis and treatment. Hematology (Am Soc Hemataol Educ Program). 2003; 520-539. PubMed 14633797

Triplett DA. Thrombophilia. In: McClatachey KD, ed. Clinical Laboratory Medicine. 2nd ed. Philadelphia, Pa. Lippincott Williams and Wilkins; 2002:1033-1049.

Collection Details:

Patient Preparation:

Do not draw from an arm with a heparin lock or heparinized catheter.

Collection Instructions:

Blue-top (sodium citrate) tube, gel-barrier tube, lavender-top (EDTA) tube, yellow-top (ACD) tube, or LabCorp buccal swab kit.

Citrated plasma samples should be collected by double centrifugation. Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.1 Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio.2,3 The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples except when using a winged blood collection device (ie, "butterfly"), in which case a discard tube should be used.4,5 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 tubes. Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Centrifuge for 10 minutes and (using a plastic transfer pipette) carefully remove two-thirds of the plasma without disturbing the cells. Deliver to a plastic transfer 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 LabCorp PP transpak frozen purple tube with screw cap (LabCorp N° 49482). The specimen should be frozen immediately and maintained 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.