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What is the reference range for alanine aminotransferase (ALT)?

2-8 U/L

8-20 U/L

The reference range for alanine aminotransferase (ALT) is typically considered to be between 8 to 20 U/L for most laboratories, making this option the correct one. ALT, an enzyme primarily found in the liver, plays a crucial role in amino acid metabolism. Elevated levels of ALT often indicate liver damage or inflammation, whereas levels within the reference range suggest normal liver function.

Variations in reference ranges can occur based on factors such as the laboratory performing the test and population demographics. As time and medical standards evolve, it’s important to rely on updated guidelines from reputable organizations when determining appropriate reference ranges. Meanwhile, other ranges provided in the choices reflect either higher thresholds that generally suggest elevated ALT levels or lower limits that do not accurately represent normal adult values.

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20-30 U/L

30-50 U/L

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