In pediatric capillary collection, what is the recommended site, depth, and technique to minimize tissue fluid contamination and ensure adequate sample?

In pediatric capillary collection, what is the recommended site, depth, and technique to minimize tissue fluid contamination and ensure adequate sample?

• A. Infants: heel puncture with warmth and depth about 1.0–2.0 mm; older children: fingertip capillary puncture on the side of the fingertip; wipe away the first drop and collect from the second drop with capillary tubes, avoiding squeezing
• B. Infants: venipuncture in the antecubital area; older children: venipuncture on the opposite arm
• C. Infants: ear lobe puncture; older children: ear lobe puncture
• D. Draw from finger pads for all ages

Answer: (A)

Focus on obtaining a clean capillary sample by controlling site, depth, and handling. For infants, use a heel puncture on the outer plantar aspect, warming to improve blood flow, and limit depth to about 1.0–2.0 mm to stay in the capillary bed without reaching bone. For older children, puncture the side of the fingertip to reduce pain and tissue injury. After puncture, wipe away the first drop to remove tissue fluids and contaminants, then collect from the second drop with capillary tubes, avoiding squeezing or milking the finger. This approach minimizes tissue fluid contamination and ensures an adequate sample. Venipuncture or using the ear lobe, or drawing from the finger pads for all ages, do not fit the capillary collection requirements and can increase sample contamination or instability.

Focus on obtaining a clean capillary sample by controlling site, depth, and handling. For infants, use a heel puncture on the outer plantar aspect, warming to improve blood flow, and limit depth to about 1.0–2.0 mm to stay in the capillary bed without reaching bone. For older children, puncture the side of the fingertip to reduce pain and tissue injury. After puncture, wipe away the first drop to remove tissue fluids and contaminants, then collect from the second drop with capillary tubes, avoiding squeezing or milking the finger. This approach minimizes tissue fluid contamination and ensures an adequate sample. Venipuncture or using the ear lobe, or drawing from the finger pads for all ages, do not fit the capillary collection requirements and can increase sample contamination or instability.