Email this page Print this page Was this page helpful?

Platelet Function Tests




Common Platelet Function Tests

Below are some of the tests that are being used to determine platelet function. In the coming years, these testing methods are expected to change and evolve as researchers continue to search for procedures that better describe and evaluate the complex clotting process.
Tests
Used for Advantages Disadvantages
Bleeding Time Screening, largely being phased out in favor of PFA-100 or other methods Physiological Not sensitive, subject to operator variability, poor reproducibility, predictive value poor, often scars
Platelet function analyzer (PFA-100®)
Screening, mimics clotting process, evaluates adhesion and aggregation Rapid, simple screening tool, identifies aspirin ingestion, can screen for von Willebrand and may monitor von Willebrand and anti-platelet therapy Sensitive to platelet count and hematocrit, full clinical use yet to be established
Platelet Aggregometry
Follow-up to abnormal Bleeding Time or PFA-100, detects responsiveness to panel of platelet activators (collagen, ADP, epinephrine, ristocetin, Arachidonic acid) Can diagnose inherited and acquired platelet dysfunction, measures aggregation Labor intensive and relatively slow
Plateletworks® Platelet counting pre and post activation, monitoring platelet function during cardiopulmonary bypass procedures Rapid, simple point-of- care test, measures percentage of platelet aggregation in whole blood Does not measure overall primary hemostasis
VerifyNow® IIb/IIIa Assay Monitor Gp IIB/IIIa anti-platelet therapy (glycoprotein inhibitors that inhibit the interaction between platelets and fibrin) Rapid, simple point-of- care test for monitoring anti-Gp IIb/IIIa therapy, measures aggregation Currently FDA approved for monitoring abciximab Gp IIb/IIIa and eptifibatide therapy
 VerifyNow® Aspirin Assay Detect platelet dysfunction due to aspirin ingestion Rapid, simple point-of-care test Current FDA approved only for detecting platelet dysfunction due to aspirin ingestion, qualitative
 Flow Cytometry Measure platelet glycoproteins, activation markers, platelet function and turnover, platelet counting, reticulated platelets Flexible and powerful, range of tests, can diagnose disorders Requires specialized operator, expensive equipment, mostly research tool at this point
 Thromboelastography (TEG)
Measure clot strength, monitor platelet function and coagulation Good technique for  measuring clot strength in whole blood Clinical utility/necessity still being argued

« Prev  |  Next »