Poor reproducibility of template bleeding time in horses

Area of Science:

• Veterinary Medicine
• Hematology

Background:

• Template bleeding time (TBT) is a diagnostic tool for platelet function, but its clinical utility is debated due to poor reproducibility and sensitivity in human medicine.
• Previous studies suggest TBT may also have limitations in horses.

Purpose of the Study:

• To evaluate the reproducibility and sensitivity of TBT in horses.
• To determine if TBT can detect the effects of etamsylate, a platelet-function-altering drug, in horses.

Main Methods:

• Twenty healthy horses were included in the study.
• TBT was measured, repeated after 2 hours and 30 days, and also assessed 2 hours post-intravenous etamsylate administration.

Main Results:

• TBT exhibited high variability, with coefficients of variation ranging from 26.8% to 45.5%.
• No significant differences in TBT values were observed over time or after etamsylate administration.
• The reference range for TBT in horses was found to be excessively wide (138.4–860.4 seconds).

Conclusions:

• TBT demonstrates poor reproducibility and an unacceptably wide reference range for clinical application in horses.
• The test is not sensitive enough to detect the effects of etamsylate on platelet function.
• Clinicians should consider alternative diagnostic tests with better reproducibility for evaluating equine platelet disorders.