Neonatal Heelstick Collection: The Complete Pediatric Phlebotomy Guide
Neonatal phlebotomy requires specialized knowledge. Improper heelstick technique causes unnecessary infant pain, hemolysis, bruising, and specimen rejection.
Anatomical Considerations
Heel contains dense nerve clusters. Medial and lateral plantar arteries run vertically through heel. Acceptable collection zones are outer areas of heel (lateral and medial surfaces), never the arch (high infection risk), toe pads, or central sole (major vessels).
Device Selection and Technique
Use automated heelstick devices calibrated for neonatal depth (typically 2.0-2.4 mm). Depth exceeding 2.4 mm risks arterial penetration and hematoma. Lancet length shorter than 3.0 mm reduces complication risk. Single-use sterile devices mandatory per infection control standards.
Collection Best Practices
Warm heel 3-5 minutes prior to puncture (increases blood flow 7-fold). Use gentle downward pressure; aggressive squeezing causes hemolysis (invalidates chemistry results). Collect in order: EDTA tube first (prevents clotting), then serum separator, then glucose tube. Minimum 500 μL required for complete newborn screening panel.
Special Considerations for Newborn Screening
Timing: Heel sticks performed 24-48 hours post-birth (earlier than 24 hours yields false-negative results for some conditions). Dried blood spots must air-dry completely before transport (prevents mold growth and hemolysis).