segmental blood pressure segmental blood pressure segmental blood pressure is used to measure actual limb blood pressures. the purpose of these measurements is to look at arterial occlusion. segmental blood pressurepurposelook at arterial occlusion in the leg pressures are measured at the ankle, below the knee, above the knee and mid-thigh. in the arm pressures are measured at the wrist, below the elbow, above the elbow and mid upper arm.