How serious is an ALT level of 200 U/L?
Generally speaking, whether a transaminase level reaching over 200 U/L is serious depends on the specific circumstances and cannot be generalized. The detailed analysis is as follows:

If the elevated levels are due to recent alcohol consumption, staying up late, intense physical activity, or taking medications that may harm the liver, and if there are no symptoms such as jaundice or abdominal pain, the condition is usually not considered severe. These cases typically involve transient liver cell injury. Once the triggering factors are removed and with short-term lifestyle adjustments, liver metabolic function can gradually recover and the indicators will decrease accordingly, so there is no need for excessive anxiety.
However, if symptoms such as fatigue, nausea, or yellowing of the skin occur, or if the patient already has underlying liver conditions like hepatitis B or fatty liver disease, the elevated transaminase levels should be taken seriously. This may indicate active inflammation in the liver. Without timely identification of the cause and appropriate intervention, liver damage could worsen. Further diagnostic tests are needed to clarify the condition and guide targeted treatment.
While awaiting medical evaluation, patients should avoid alcohol and any substances potentially harmful to the liver, and maintain a healthy lifestyle to reduce the burden on the liver.