Lie down on the table with the head facing the back mirror and the feet toward the wall. You can use a step stool to get on the table. Ask the SP to bend his or her knees at a 90˚ angle, feet resting flat on the table and arms crossed over the chest(Figure 1).

Figure 1

Locate the right iliac crest at the point where it intersects the midaxillary line and use the tape to measure the distance between the bottom and the high aligning the marker. (Figure 2)

Figure 2