What is the recommended lancet length for newborns?

• A. 1.5 mm
• B. 1.75 mm
• C. 2.0 mm
• D. 2.5 mm

Answer: (B)

Puncture depth must reach the superficial capillaries in the newborn heel without risking bone injury. For newborns, about 1.75 mm is an optimal depth: it is deep enough to access the capillary blood needed for reliable sampling, yet shallow enough to minimize pain and the chance of hitting bone or causing tissue injury. If the puncture is too shallow, you may not obtain enough blood and need a repeat site. If it’s too deep, there's a higher risk of penetrating bone and causing complications. So, 1.75 mm strikes the right balance for neonatal heel sticks.