Background: Mean platelet volume (MPV) may be a useful biomarker for platelet activation in obese patients. However, storage duration and use of anticoagulant K3-ethylenediaminetetraacetic acid (EDTA) may interfere with these measurements.
Objectives: The aim of this study was to measure the variability of MPV in obese patients following exposure to EDTA.
Method: A total of 160 patients were divided into 3 groups according to body mass index (BMI; normal: <25 kg/m2; overweight: 25-30 kg/m2; obese: >30 kg/m2). Blood was collected in sterile tubes containing K3-EDTA. Blood cell counts were obtained using the CELL-DYN Ruby system immediately and 1, 2, and 3 h after collection.
Results: MPV was found to be directly proportional to BMI. With the addition of EDTA, MPV was increased in the first hour after collection; MPV then decreased to levels that were lower than initial baseline measurements.
Conclusions: K3-EDTA use alters platelet volume. The time from collection to measurement should be standardized to reduce MPV value variance. MPV should be determined within 1 h of collection to avoid anticoagulant use-related interference.
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