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Health Protocols

Non-Alcoholic Fatty Liver Disease (NAFLD)

Diagnosis of NAFLD

In order to make a diagnosis of NAFLD, a physician considers both clinical data about the patient, and, when appropriate, data from a liver biopsy (for definitive diagnosis). The first indication that NAFLD might be present is rarely a symptom, but rather a finding of elevated levels of liver enzymes in the blood, indicating early liver cell damage. Other treatable causes of liver disease must be ruled out by appropriate testing (eg, hepatitis B or C), and other liver functional parameters (eg, blood clotting factors) should also be measured. Some physicians will do an imaging study such as a liver ultrasound, but normal appearance of the liver does not rule out NAFLD. Alcoholic fatty liver, which can closely resemble NAFLD, must be ruled out. This can be done by reliably establishing the absence of substantial alcohol intake (less than 20‒40 grams of alcohol per day, equivalent to 2‒3 drinks). If and when there is concern that the more dangerous condition, NASH, is present, then liver biopsy must be performed to establish a definitive diagnosis.17

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