Heparin in vitro sensitivity of the activated partial thromboplastin time in canine plasma depends on reagent.
The in vitro heparin sensitivity of 6 different commercial activated partial thromboplastin time (APTT) reagents was investigated based on artificial plasma samples prepared by addition of sodium heparin at different activities (0-1.5 IU/ml) to pooled normal canine plasma. Statistical analysis using 2-way analysis of variance was based on APTT ratios (APTT/mean APTT control). Significant differences between the APTT ratios of different APTT reagents (P < 0.00001) were found, which also depended on heparin activity (interaction between the factors; P < 0.00001). For example, mean APTT ratio at 0.7 IU/ml heparin varied between 1.2 and 2.5. The results of this study indicate that recommendations for the control of heparin therapy in dogs by APTT ratio should be reagent specific.
Mischke
Reinhard
R
Clinic for Small Animals, School of Veterinary Medicine Hannover, Bischofsholer Damm 15, D-30173 Hannover, Germany.
D000818:Animals; D000925:Anticoagulants / Q000494:pharmacology*; D004283:Dog Diseases / Q000188:drug therapy; D004285:Dogs; D006493:Heparin / Q000494:pharmacology*; D066298:In Vitro Techniques; D007202:Indicators and Reagents; D010314:Partial Thromboplastin Time / Q000662:veterinary; D015203:Reproducibility of Results; D013048:Specimen Handling
D000925:Anticoagulants; D007202:Indicators and Reagents; D006493:Heparin