What is the normal value of alanine aminotransferase (ALT) in children?

Apr 10, 2023 Source: Cainiu Health

Dr. Jiang Weimin

Introduction

The normal value of alanine aminotransferase (ALT) in children is 0 U/L to 45 U/L. Alanine aminotransferase in children is a common enzyme found in liver cells and serves as an indicator for diagnosing viral hepatitis and toxic hepatitis. The ALT level typically rises when liver cells are damaged, such as due to dietary factors, metabolic disorders, or infections. However, under normal circumstances, the level ranges from 0 U/L to 45 U/L.

The normal value of alanine aminotransferase (ALT) in children is typically 0 U/L to 40 U/L. The detailed analysis is as follows:

Children refer to individuals under 18 years of age. ALT is a common enzyme found in liver cells and serves as an important indicator in diagnosing diseases such as viral hepatitis and toxic hepatitis. When liver cells are damaged, ALT levels may rise due to factors such as diet, metabolic disorders, or infections. However, under normal circumstances, the ALT level ranges from 0 U/L to 45 U/L.

If abnormal ALT levels are detected, it is recommended to promptly visit a正规 hospital for further evaluation to identify the underlying cause and receive appropriate treatment, thereby preventing further liver cell damage and protecting overall health.

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Can I pass a physical examination with an alanine aminotransferase (ALT) level of 150?

Alanine aminotransferase (ALT) level of 150 exceeds the normal range, making it difficult to pass a routine medical examination. The normal reference value for ALT is generally no more than 40; a level of 150 indicates a moderate elevation, suggesting possible liver damage. Most health checkups have specific requirements for liver function parameters, and such values typically do not meet the eligibility criteria, thereby affecting the examination outcome.

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Normal aspartate aminotransferase (AST), elevated alanine aminotransferase (ALT)—what does this indicate?

If the elevation is caused by physiological factors, it commonly occurs after recent sleep deprivation, excessive alcohol consumption, intense exercise, or taking certain medications. Alanine aminotransferase (ALT) is primarily present in the cytoplasm of hepatocytes; these factors can temporarily increase hepatocyte membrane permeability, leading to enzyme leakage into the bloodstream and thus elevated levels. However, they do not cause severe hepatocyte necrosis. Aspartate aminotransferase (AST), mainly located within mitochondria, therefore remains normal.

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What does it mean if only alanine aminotransferase (ALT) is elevated?

In general, elevated alanine aminotransferase (ALT) alone may be caused by factors such as intense physical exercise, staying up late, fatigue, non-alcoholic fatty liver disease, drug-induced liver injury, or viral hepatitis. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under a doctor's guidance. In daily life, alcohol consumption should be avoided, intake of high-fat and high-sugar foods reduced, and liver function tests performed regularly.

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What does abnormal alanine aminotransferase (ALT) mean, and what should be done?

In general, abnormal alanine aminotransferase (ALT) levels may be caused by intense physical exercise, staying up late, viral hepatitis, fatty liver, drug-induced liver injury, or other reasons. If discomfort symptoms occur, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. In daily life, maintain a regular作息 schedule and avoid staying up late and excessive fatigue.

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What does it mean when alanine aminotransferase (ALT) is high, and what should be done?

In general, elevated alanine aminotransferase (ALT) levels may be caused by factors such as staying up late, fatigue, excessive alcohol consumption, viral hepatitis, fatty liver disease, or drug-induced liver injury. If discomfort symptoms occur, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. In daily life, maintain regular作息 habits and avoid staying up late or drinking alcohol; eat a balanced diet and reduce intake of high-fat and high-sugar foods; consult a doctor before taking any medication.

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Is an alanine aminotransferase (ALT) level of 13 U/L normal?

In general, an alanine aminotransferase (ALT) level of 13 U/L falls within the normal range. Liver health can be maintained through simple daily habits: maintaining regular作息 and avoiding staying up late to allow the liver sufficient time for repair at night; dietary adjustments include reducing intake of high-fat and high-sugar foods, consuming more fresh fruits and vegetables, and increasing优质 protein intake to reduce the metabolic burden on the liver.

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What does it mean when alanine aminotransferase and aspartate aminotransferase levels are elevated, and what should be done?

In general, elevated levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) may be caused by intense physical exercise, staying up late, viral hepatitis, fatty liver disease, drug-induced liver injury, or other reasons. If any discomfort symptoms occur, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. In daily life, maintain a regular sleep schedule and avoid staying up late or consuming alcohol.

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How long does it take for transaminase to decrease from 78 to 40?

Transaminase levels decreasing from 78 U/L to 40 U/L typically takes 1 to 4 weeks, with the exact duration varying depending on the underlying cause and treatment measures. If elevated transaminase levels are due to physiological factors such as staying up late, alcohol consumption, or intense physical exercise, levels usually return to normal within about one week by adjusting lifestyle habits—such as ensuring adequate sleep, strictly abstaining from alcohol, and reducing high-intensity exercise. In such cases, no specific medical treatment is required.

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