Final answer:
The heel puncture depth of a lancet refers to the depth at which the lancet pierces the skin to collect a blood sample.
Step-by-step explanation:
The heel puncture depth of a lancet refers to the depth at which the lancet pierces the skin in order to obtain a blood sample for testing. This depth is typically controlled by the lancet device's settings, which can be adjusted according to the age and weight of the patient.
For newborns, the recommended heel puncture depth is around 1.0 to 2.4 mm. This ensures a successful blood sample collection while minimizing discomfort and risk of injury. The depth may vary depending on the specific lancet device and the requirements of the laboratory conducting the blood test.