Final answer:
To measure an apical pulse, a CPCT should place the stethoscope at the apex of the heart, located near the left nipple at the fifth intercostal space.
Step-by-step explanation:
A CPCT (Certified Patient Care Technician) should measure the patient's apical pulse at the location of the heart, specifically at the apex where the heartbeat can be most accurately heard. This measurement is obtained by placing the stethoscope on the patient's chest, near the left nipple at the fifth intercostal space (the space between the ribs). It's important that the CPCT listens carefully for the heartbeat to ensure a precise measurement of the apical pulse rate.