ALT是人体内促进氨基酸和α-酮酸氨基转移的酶之一,在肝炎的诊断及防治方面具有重要临床价值,也是血站系统筛查血液的一项重要指标。但由于ALT并非肝炎诊断的特异性指标,生理、病理,乃至生活方式和饮食习惯也可能引起ALT活性增高,因而献血者所献血液的ALT不合格导致报废的血液, ALT is one of the enzymes in the human body that promotes the amino acid and α-keto acid amino transfer. It has important clinical value in the diagnosis and prevention and treatment of hepatitis and is also an important index for blood screening of bloodstain system. However, because ALT is not a specific indicator of hepatitis diagnosis, physiology, pathology, even lifestyle and eating habits may also lead to increased ALT activity, thus donating blood donated ALT failed lead to scrapped blood,