CPT® Code 91200

Liver elastography, mechanically induced shear wave, is a non-invasive diagnostic procedure designed to evaluate the stiffness of the liver. This assessment is crucial as liver stiffness can be an indicator of various liver conditions. The procedure utilizes a specialized transducer that is attached to an ultrasound probe, which generates a shear wave, or vibration, that is transmitted into the liver tissue. As this shear wave travels through the liver, its velocity is measured, and this data is subsequently converted into a quantitative measurement expressed in kilopascals (kPa). The stiffness of the liver can provide valuable insights into the presence and severity of liver diseases, including those caused by viral infections, portal hypertension, and the effects of substances such as drugs or alcohol. Additionally, liver elastography is instrumental in monitoring the condition of a transplanted liver. The ultrasound probe is strategically positioned at the intercostal space, typically near the right lobe of the liver, to ensure accurate delivery of the shear wave. The results of the elastography are processed and made available to the clinician in real-time, allowing for immediate interpretation. However, it is important to note that the reliability of the results may be compromised in certain patient populations, such as those who are obese, have ascites, or possess a significant amount of chest wall fat, which can affect the accuracy of the measurements obtained during the procedure.