Which method is best for performing a heel stick for glucose monitoring in a newborn?

Warming the heel to increase circulation is the best method for performing a heel stick for glucose monitoring in a newborn. This practice helps to vasodilate the blood vessels in the area, which can increase blood flow to the capillaries. Improved circulation results in a higher yield of blood, making the procedure easier and potentially less traumatic for the infant.

When a heel is warmed, the blood vessels expand, leading to richer blood supply near the surface of the skin. This increased perfusion not only minimizes the difficulty in obtaining a blood sample but also contributes to a more reliable glucose measurement. This technique is especially important in newborns, whose small blood volume and delicate skin can complicate blood draws.

In contrast to this method, trying to apply pressure before the stick could potentially lead to tissue damage or an inadequate sample due to altered blood flow. Using the baby's thumb is not suitable for heel sticks, as the fingers are not typical sites for this procedure. After the procedure, applying a cold pack is not recommended, as this can constrict blood vessels and make subsequent procedures more challenging.