Test Searches require one of the following browsers: Google Chrome, Safari, or Firefox. This page WILL NOT WORK with Internet Explorer versions 8 or older. Alphabetical Index A B C D E F G H I J K L M N O P Q R S T U V W-Z ANATOMIC PATHOLOGY TESTS Search Tests Von Willebrand Disease (vWD) Evaluation (LAB002011) Test Mnemonic: vWD Eval Specimen Requirements: Fill within ±10% from stated capacity. Immediately after draw, gently invert 3-4 times. Test Included: vWF antigen, vWF activity, Fibrinogen, Factor VIII activity, PLT count, Dagnostic Management team eval, If indicated vWF Ristoctin Co-Factor, vWF Multimers, Collection: Routine venipuncture; discard 1st mL of blood by collecting a discard tube prior to collecting the blue-topped (3.2% sodium-citrate) tube. For collections with butterfly blood collection sets, a discard tube should also be collected prior to collection of the blue top to ensure sufficient sample volume. Drawing a discard tube will displace the air from the blood collection set tubing to ensure proper blood draw volume. Container: Both Blue-topped (3.2% sodium-citrate) tube EDTA (Lavender-top tube) Minimum Volume: 3 mL plasma Storage/Transport: Blue Top: If delivery time is to be greater than 4 hours from time of draw, centrifuge the specimen for 15 minutes at 2000-2500g Transfer plasma to 12x75 plastic tube Cap tube and re-spin for 15 minutes at 2000-2500g CAREFULLY remove from centrifuge without disturbing any platelets and/or cell pellets that might be on the bottom or sides of the tube. Carefully transfer plasma into freezer tubes (plastic screw-top cryo-tubes) for testing or freezing. Lavender Top: Room Temperature 4 hours . If testing cannot be completed with in 4 hours sample must be refrigerated. Stability: Blue Top: Whole blood 4 hours at room temperature. Plasma 8 hours at 20+/- 5°C. Frozen at -20 °C 2 weeks. Lavender Top: Stable Refrigerated for 36 hours. Causes for Rejection: QNS, clotted, severely hemolyzed specimen, wrong tube, high hematocrit (> 55%), sample identification error, sample processed/transported, and/or stored improperly. Methodology: See each individual tests for Methodology Performed: Lab: CLS Specialty Lab Click to view CLS Specialty Lab website PLT count- UTMB Hematology Ristocetin Co-Factor and vWF Multimers- send out Turnaround Time: The hours of operation are Monday – Friday from 8:00 am to 4:00 pm with an expected TAT of 4 hours. STAT requests after business hours will be evaluated and handled by the on-call staff member. Reference Range: See each individual test for Ranges Effective Date: 08/15/2023 Reviewed By/Date: - Approved By/Date: Laposata, Michael - 01/26/2024 When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent. « Back