What is the quickest and most common method to obtain neonatal blood for glucose screening 1 hour after birth?

Choice A rationale Puncturing the lateral or medial plantar surface of the heel is the standard and safest technique for neonatal heel sticks to obtain capillary blood, typically used for glucose screening or newborn screens. This area avoids the central calcaneus bone, reducing the risk of osteomyelitis, and provides sufficient blood flow due to high capillary density, making it the quickest and most common method used one hour after birth. The puncture depth should be less than 2.0 mm. Choice B rationale Obtaining a sample from the umbilical cord, while a source of fetal blood, is generally performed immediately at birth for blood typing or gas analysis, not as a quick or common method for routine glucose screening one hour postpartum. Capillary heel stick is preferred as it is less invasive and more suitable for ongoing monitoring in the postnatal period, reflecting the infant's current physiological status. Choice C rationale Puncturing a fingertip is not the preferred or common site for capillary blood collection in neonates or infants under one year of age because the fingertip pad lacks sufficient tissue volume and the bone is too close to the surface. Using the heel ensures better blood flow for adequate sampling while minimizing the risk of bone injury and infection, which are greater risks in an infant's small digits. Choice D rationale Obtaining a laboratory chemical determination is a broad action describing the analysis of blood components like glucose, but it is not a method of specimen collection itself. The physical action of obtaining the blood sample, which is the focus of the question, must precede the laboratory analysis, making this choice an incomplete answer regarding the collection technique.