Which fingers should be used for dermal puncture to obtain capillary blood specimens?

For dermal puncture to obtain capillary blood specimens, the recommended fingers are typically the middle or ring finger of the non-dominant hand. These fingers have adequate blood supply and are less likely to be calloused compared to the index finger. The puncture should be made on the side of the fingertip to minimize discomfort and maximize blood flow. In infants, the heel is often used for this procedure.