What your ALT level can reveal about liver health
This article explains the role of ALT enzymes in liver health and how their levels in blood tests can indicate liver injury. It notes that while ALT is a sensitive marker, normal levels do not always rule out significant liver disease.
Why it matters
Understanding medical diagnostic markers helps patients interpret health data and recognize the limitations of standard blood tests.
According to the World Health Organization (WHO), liver diseases account for around two million deaths globally every year. Viral hepatitis alone caused an estimated 1.3 million deaths in 2022, with about 254 million people living with chronic hepatitis B infection and around 50 million with chronic hepatitis C infection. There is also a rising burden of metabolic dysfunction-associated steatotic liver disease (MASLD), previously known as non-alcoholic fatty liver disease, driven by increasing obesity and diabetes.
ALT, also known as serum glutamic-pyruvic transaminase (SGPT), is an enzyme found predominantly inside liver cells. When these cells are damaged or inflamed, ALT leaks into the bloodstream, making it one of the earliest laboratory markers of liver injury.
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