Platelet function testing to assess effectiveness of platelet transfusion therapy.

Area of Science:

• Hematology
• Transfusion Medicine
• Clinical Pathology

Background:

• Posttransfusion corrected count increments (CCI) are standard for assessing platelet transfusion effectiveness.
• However, CCI may not reflect improved platelet function or hemostatic capacity.
• This study investigated platelet transfusion effectiveness using Platelet Function Analyzer (PFA-100) and CCI.

Purpose of the Study:

• To evaluate the effectiveness of platelet transfusions.
• To compare the utility of Platelet Function Analyzer (PFA-100) assays versus post-transfusion corrected count increments (CCI) in assessing transfusion outcomes.
• To determine if PFA-100 results correlate with clinical improvement in patients with bleeding indications.

Main Methods:

• Evaluated platelet transfusion requests with normal coagulation profiles.
• Performed pre- and post-transfusion laboratory tests including PFA-100 assays (CEPI and CADP cartridges), complete blood count, and routine coagulation profile.
• Assessed clinical response to platelet therapy through chart review and evaluation of bleeding symptoms.

Main Results:

• Thirty-five transfusion episodes were analyzed in 31 patients.
• Group A (n=17) showed PFA-100 closure time shortening/normalization and correlated with bleeding cessation in 6/9 patients.
• Group B (n=18) showed no PFA-100 improvement and did not correlate with cessation of bleeding in any of the 7 patients with bleeding indications (p=0.0114).
• Post-transfusion CCI showed no correlation with bleeding symptoms (p=0.500).

Conclusions:

• Platelet Function Analyzer (PFA-100) testing is a more effective indicator of platelet transfusion outcomes than post-transfusion CCI.
• PFA-100 results correlate with clinical improvement in patients experiencing bleeding.
• PFA-100 can aid in supporting platelet transfusion decisions and optimizing blood bank inventory management.