PLATELET INHIBITION, ASPIRIN

Hematology

LAB5210326

Aspirin-Platelet Sensitivity

VerifyNow special tubes provided by, and drawn by, Laboratory. See Instructions/Remarks below for proper procedure for drawing blood.

Collection of blood sample should be performed with care to avoid ì hemolysis or contamination by tissue factors. 1) Set up a discard tube -- may be red-top (no-additive), blue, blood ì culture, or heparin tube. The discard tube cannot contain EDTA (lavender ì top). 2) VerifyNow collection tubes are Greiner Bio-One Vacuette partial-fill ì blood collection tubes (2 mL fill volume) containing 3.2% sodium citrate. 3) Obtain samples from extremity free of IV infusions. 4) If drawing for a CBC at the same time, FILL THE CBC TUBE LAST to avoid ì contamination by EDTA. 5) Collect whole blood using a 21 guage or larger needle. Butterfly (21 ì gauge) is okay. 6) First tube is the discard tube (at least 2 mL), second and third tubes ì are the VerifyNow tubes. 7) Fill the second tube (VerifyNow) to the black line (approx. 1/2 of the ì tube. Do not under or over fill.) Fill the third VerifyNow tube to the ì black line. 8) Gently invert the tubes at least 5 times to ensure complete mixing. 9) Discard the discard tube. 10) DO NOT SEND VERIFYNOW TUBES TO THE LAB VIA THE TRANSLOGIC TUBE ì SYSTEM. Hand deliver, Ambient:. LAB: Test must be performed within 4 hours of collection. Do NOT centrifuge tubes.

Ambient 4 hrs

Hemolyzed, contanminated, clotted, not enough volume

Draw between 7am - 7pm

Testing available 7am - 7pm Reports same shift

Aspirin Assay: (ARU - Aspirin Reaction Units)
≥550 ARU - Platelet dysfunction consistent with aspirin has not been detected
< 550 ARU - Platelet dysfunction consistent with aspirin has been detected

Results should be interpreted in conjunction with other laboratory and clinical data available to the clinician.