The probe is gently applied to the surface of the skin without subsidence, measuring the thickness of the deltoid flap in 8 positions: 1 (located on the axis and below 5 cm A point), 2 (point A - intersection of the axis of the flap and posterior deltoid muscle), 3 (acromion), 4 (located on the axis and on the acromion 5 cm), 5 and 6 (two symmetrical positions via acromion and 5 cm from the acromion, position 5 in front and position 6 in the back), 7 and 8 (two symmetrical positions over point A and 5 cm from point A, position 7 in front and position 8 on the back).