CPT® Code 95875

An ischemic limb exercise test, designated by CPT® Code 95875, is a diagnostic procedure aimed at evaluating the metabolic responses of muscles during induced ischemia. This test is particularly useful in identifying metabolic disorders that may contribute to symptoms such as muscle weakness, fatigue, and cramps. Conditions such as glycolytic disorders and myoadenylate deaminase deficiencies can lead to these symptoms, and the test helps in determining their presence. The procedure begins with the placement of a venous catheter in the patient's hand or forearm, allowing for the collection of blood samples. An initial blood sample is taken to establish baseline levels of key metabolites, specifically lactate and ammonia, which are critical for assessing muscle metabolism. Following this, a blood pressure cuff is applied to the upper arm and inflated to a level above the patient's systolic blood pressure, effectively restricting blood flow to the tested limb. The patient is then instructed to perform exercises using a hand grip dynamometer, which involves squeezing and releasing the device at a controlled pace. This exercise continues until the patient experiences muscle fatigue, pain, or cramping, typically lasting a minimum of two minutes. After the exercise, the blood pressure cuff is deflated, and additional blood specimens are collected at specified intervals to measure changes in lactate and ammonia levels, providing valuable insights into the muscle's metabolic state during ischemia.