Coagulation studies f plasmas from healthy domesticated animals and persons.

This research determines the optimal conditions for common blood clotting tests in different animals including horses, cattle, dogs, cats, and humans. It discovers that differences in calcium chloride and sodium chloride concentrations significantly affect test results, and the manufacturer’s recommended conditions are not always optimal.

Research on Coagulation in Different Species

• The research is focused on finding the optimal conditions for running coagulation tests in a range of species. This includes horses, cattle, sheep, goats, swine, dogs, cats, and humans. The aim is to determine the best test conditions for the activated partial thromboplastin time (APTT), 1-stage prothrombin time (PT), and Russell’s viper venom time (which is another coagulation test).

Impact of Calcium Chloride and Sodium Chloride Concentrations

• An intriguing finding in this research is the significant impact of Calcium Chloride (CaCl2) and Sodium Chloride (NaCl) concentrations on the APTT and PT reactions. If the CaCl2 and NaCl levels are too high or too low for a particular animal, it can cause the APTT and PT results to be inaccurate.
• The APTT was found to be more sensitive than the PT to changes in CaCl2 concentration. This suggests that the APTT might need to be adjusted more carefully when testing different species to ensure accurate results.

Manufacturer’s Recommended Conditions

• The findings also reveal that the manufacturer’s recommended conditions are not always the best for some species. The study found that the CaCl2 concentration recommended by the manufacturer was suboptimal for plasmas of some domesticated animals. This means that the manufacturer’s guidelines may need to be adjusted for some domesticated species to provide the most accurate results.
• Further, the research finds that the optimal concentration of Infusorial earth (also known as Celite, a substance used as an activator in these tests) provided by the manufacturer was appropriate for all the tested species except for horses and swine.

Optimal Incubation Times

• For the equine, bovine, ovine, and caprine plasmas, the optimal incubation times for the APTT were shorter than the 5 minutes recommended for human plasma. On the other hand, the optimal incubations for porcine and canine plasmas were longer than 5 minutes. This indicates a species-specific variation in optimal incubation times.

Storage Stability

• Finally, the APTT and PT of all plasmas tested were stable for up to 3 hours’ storage at 4 degrees Celsius, with the exception of the porcine plasma. This means that most plasmas can be kept for up to 3 hours without affecting the results of these tests, which could be advantageous in certain clinical or research settings.