capillary refill time (CRT)
Ambulance driver: We have a motor vehicle accident victim who is unresponsive, and their capillary refill time is more than 4 seconds.
Doctor: That's a very dangerous sign. You need to get the victim to the hospital immediately.
Explanation: The capillary refill time, also known as "CRT," is the time it takes for normal skin color to return after the thumbnail is pressed down. If more than 4 seconds pass before the color under the thumbnail returns, it is a sign that blood circulation is in danger. This test is often used in emergencies when several people are injured and there is no medical equipment available.
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