Final answer:
The priority action of the nurse would be to call the health care provider immediately as a capillary refill of 6 seconds indicates poor circulation and may be a sign of compartment syndrome.
Step-by-step explanation:
The priority action of the nurse would be to call the health care provider immediately. A capillary refill of 6 seconds indicates poor circulation, which may be a sign of compartment syndrome. Compartment syndrome is a serious condition that occurs when increased pressure within a muscle compartment impairs blood flow and can be limb-threatening. It requires immediate medical intervention to prevent further complications.