What is the normal capillary refill time (CRT) for animals?

The normal capillary refill time (CRT) for animals is typically around 1 to 2 seconds. This measurement is taken to assess the circulatory system's effectiveness and hydration status. During the CRT test, pressure is applied to a mucous membrane (often the gums) until it blanches, and then the time taken for the color to return is recorded. A CRT of 1 to 2 seconds indicates that blood is returning effectively to the area, suggesting that the animal is likely well-hydrated and has good perfusion.

If the CRT exceeds 2 seconds, it may signal potential issues such as dehydration, shock, or other circulatory problems. Thus, understanding that a CRT of 1 to 2 seconds is normal helps in evaluating an animal's health during veterinary assessments.