What is the minimum acceptable age to collect blood from an infant by finger stick instead of a heel stick?

0 to 1 and 1 and up. Heel stick is preferred for new born and infants up to 1 year finger stick for children one year amd older. Consider also premature babies with very low weight for heelsticck as your choice. If any doubt heel stick is the safest.
Above 3 months ofage. Pediatric blood drawing is not a complex science. Venipuncture, finger stick and heel stick are the three most common techniques utilized to draw blood from infants. The best method for pediatric blood drawing ultimately depends on the child's age. Heel stick technique is used on infants less than 3 months of age. For infants greater than 3 months of age the preferred technique is finger stick.