von WILLEBRAND FACTOR ANTIGEN; vWF Ag

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THE VON WILLEBRAND FACTOR ANTIGEN (VWF:AG) TEST MEASURES THE AMOUNT OF VON WILLEBRAND FACTOR (VWF) PROTEIN IN THE BLOOD. 1 VWF IS ESSENTIAL FOR BLOOD CLOTTING, AS IT HELPS PLATELETS STICK TOGETHER AND FORM A CLOT AT THE SITE OF AN INJURY. 2 THIS TEST IS USED TO DIAGNOSE VON WILLEBRAND DISEASE, A BLEEDING DISORDER CAUSED BY A DEFICIENCY OR DYSFUNCTION OF VWF. 3 IT CAN ALSO BE USED TO MONITOR THE EFFECTIVENESS OF TREATMENT FOR THIS CONDITION AND TO EVALUATE BLEEDING TENDENCIES IN INDIVIDUALS WITH OTHER MEDICAL CONDITIONS. 4

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3 ML WHOLE BLOOD IN 1 BLUE TOP (SODIUM CITRATE) TUBE. MIX THOROUGHLY BY INVERSION. TRANSPORT TO LAB WITHIN 4 HOURS. IF THIS IS NOT POSSIBLE, MAKE PPP WITHIN 1 HOUR OF COLLECTION AS FOLLOWS: CENTRIFUGE SAMPLE AT 3600 RPM FOR 15 MIN. & TRANSFER SUPERNATANT TO A CLEAN PLASTIC TUBE. CENTRIFUGE THIS SUPERNATANT AGAIN AT 3600 RPM FOR 15 MIN. & FINALLY TRANSFER THE SUPERNATANT (PPP) TO 1 LABELLED CLEAN PLASTIC SCREW CAPPED VIAL. FREEZE IMMEDIATELY. SHIP FROZEN. OVERNIGHT FASTING IS PREFERRED. DULY FILLED .

CHEMILUMINESCENT IMMUNOASSAY (CLIA)

REPORT ON 3RD DAY EVENING 7PM

OVERNIGHT FASTING IS PREFERRED. IT IS RECOMMENDED THAT PATIENT DISCONTINUES HEPARIN FOR 1 DAY AND ORAL ANTICOAGULANTS FOR 7 DAYS PRIOR TO SAMPLING AS THESE DRUGS MAY AFFECT TEST RESULTS. DISCONTINUATION SHOULD BE WITH PRIOR CONSENT FROM THE TREATING PHYSICIAN. DULY FILLED .

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