Abstract
Background Sampling small volumes of blood may be necessary, particularly in pediatric patients, or in case of difficult or recurrent venipunctures. Methods Routine hemostasis test results evaluated in partial- and full-draw evacuated polymer tubes obtained in 4 centers were compared. Results No relevant discrepancy (Bland-Altman) was found between test results measured in partial- and full-draw tubes obtained from untreated patients and from patients on vitamin K-antagonist or low molecular weight heparin. In patients on unfractionated heparin (UFH), significantly lower anti-FXa activity [median = 0.29 IU/mL (range:0.04-1.15) vs. 0.39 (0.05-1.25), n = 89, p < 0.0001] and shorter aPTT were measured in partial-draw tubes. This discrepancy was likely to be related to the release of higher amounts of PF4 after increased platelet activation in partial-draw tubes. As CTAD is known to counteract platelet activation, we then collected blood into partial-draw CTAD tube and full-draw citrate tube. Both in patients on UFH and in untreated patients, no relevant difference could be demonstrated for all studied parameters (Bland-Altman), including aPTT and anti-FXa activity, even if analytical comparison showed significantly higher anti-FXa activity in partial-draw CTAD than in full-draw citrated tubes with a mean bias of 0.02 IU/mL, identical throughout the measuring range. Conclusions These results suggest that samples collected into partial-draw citrate tubes allow accurate routine coagulation testing in all patients but those requiring UFH assessment, in which their use led to a significant underestimation of anticoagulation. In such cases, partial-draw tubes containing CTAD could be validly used to monitor heparin therapy as well as to perform routine coagulation testing.
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