What is the significance of capillary refill time?

Capillary refill time is an important assessment tool that evaluates blood circulation, particularly in the extremities. When a person's capillary refill is measured, the healthcare provider applies pressure to an area such as the nail bed, which temporarily forces blood out and makes the area blanche. Upon release, the area should quickly return to its normal color as blood flow returns. A normal capillary refill time is typically less than two seconds in healthy individuals, indicating adequate perfusion and circulation.

Prolonged capillary refill time can signify poor circulation, which may be associated with conditions like shock, hypothermia, or dehydration. This simple yet effective method helps responders gauge the circulatory status of a patient and can provide critical information during an emergency assessment, especially in pediatric patients where evaluating circulation can often be more challenging.