In China, a more extensive population ALT screening was conducted in the 1960s, and asymptomatic elevated serum ALT accounted for about 5-10% of the population. After the development of HBsAg testing, it was found that the detection rate of HBsAg was three times higher than normal in those with abnormal ALT, and nearly half of those with elevated single ALT were hepatitis B without xanthogranuloma. So how is a single alt elevation checked? Here’s what you need to know. Examination of elevated single alt 1, in addition to visual observation without jaundice, serum jaundice index and bilirubin quantification, are generally normal. 2, clinical symptoms and signs are similar to those of jaundiced hepatitis. However, the symptoms are mild, and there are fewer cases of fever than jaundice hepatitis, and some patients are asymptomatic and found in the health screening. 3. There are more cases of liver enlargement and discomfort or pain in the liver area. 4, liver function damage is mild, transaminases are mildly elevated. 5.The onset of the disease is insidious, slow and the symptoms are mild. Therefore, some patients cannot be detected early after the disease, so that the course of the disease is prolonged. There are still 36.04% of patients with jaundice free viral hepatitis whose clinical symptoms do not improve or worsen within 6-9 months after the onset of the disease, 62.44% of patients whose liver examination does not shrink or increases instead, and 57.2% of patients with recurrent disease course can be prolonged for more than 1-6 years in some cases. In contrast, most cases of jaundice (76.66%) disappeared or improved significantly in 4-9 weeks, and the liver shrank or returned to normal. 6, the incidence of hepatitis without jaundice is far more than that of jaundice, accounting for about 90% or more of the total incidence.