Tina had brisk capillary refill (less than 3 seconds). what does this mean?

This indicates blood flow in the capillary. Brisk capillary refill indicates that the arterial supply to the distal parts are enough to provide oxygen and nutrients. This test can also allow to examine if there is dehydration and inadequate blood volume to perform perfusion. This test can be done by pressing the the soft pad of a finger until it turns white, then observe how long it will take to its original color. Prolonged capillary refill means patient is in shock and adequate hydration must be started.