Why is capillary refill time included in vital signs assessments, and what is considered normal?

• A. It assesses central perfusion; normal refill is less than 1 second
• B. It assesses peripheral perfusion; normal refill is less than 2 seconds
• C. It measures oxygen saturation
• D. It measures blood pressure

Answer: (B)

Capillary refill time is included in vital signs to gauge peripheral perfusion, showing how well blood is reaching the small vessels in the skin. To check it, press firmly on a fingertip or nail bed until it blanches, then release and observe how quickly color returns. A normal refill is typically under two seconds, indicating adequate peripheral blood flow. If the refill is delayed beyond two seconds, it can signal reduced peripheral perfusion, which may occur with dehydration, shock, or vasoconstriction from cold. This measure focuses on peripheral circulation rather than central perfusion, and it does not assess oxygen saturation or blood pressure—that’s what pulse oximetry and a blood pressure cuff are for. So capillary refill time provides a quick, useful glimpse of circulation status as part of the vital signs assessment.