Final answer:
The recommended depth for a heel puncture according to CLSI standards is 2.0 mm.
Step-by-step explanation:
According to the CLSI standards, the recommended depth for a heel puncture is 2.0 mm. This depth is sufficient enough to obtain a blood sample while minimizing the risk of injury to the bone. CLSI guidelines are meticulous in detailing the proper procedure to ensure safety and accuracy in obtaining blood specimens.