Fasting Requirements for Liver Imaging Studies

A nurse is reviewing the results of a patient's recent liver function tests (LFTs). The healthcare provider has ordered additional diagnostic testing to further investigate the patient's elevated alanine aminotransferase (ALT) levels. The nurse understands that specific diagnostic imaging studies may be needed to assess for potential liver damage or disease. In preparing the patient for these tests, the nurse must explain that reasonable precautions will include fasting and avoiding certain substances prior to the imaging.

When performing imaging studies such as an abdominal ultrasound or a CT scan of the liver, the nurse knows that specific preparation may involve instructing the patient to refrain from eating or drinking for at least ______ hours preceding the test to ensure accurate results.