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I saw the report you have attached (attachment removed to protect patient identity). Sorry for your discomfort. Your liver enzymes that is SGOT (aspartate transaminase), SGPT (alanine transaminase), alkaline phosphatase and GGT (gamma-glutayl transferase) are normal. The other liver function parameters are also normal reflecting adequate and healthy liver.
The total bilirubin level should be between 0 to 1 mg/dl. Yours is 1.6 mg/dl. Do not worry about the mild increase in value. This increase in total bilirubin level is due to a mild increase in the indirect bilirubin level of 1.3 mg/dl. Your direct bilirubin is 0.3 mg/dl. In case if your liver is not working properly, then there would be more increase in direct bilirubin component and also other enzymes of liver would be raised (in your case liver function test and direct bilirubin component is normal).
Now my question is, why is there an increase in indirect bilirubin? (which is the cause of the increase in total bilirubin level). This indirect bilirubin increase indicates some acquired hemolysis of RBCs (red blood cells), which may be due to an infection you recently had. In your report below, you have a normal Hb (hemoglobin) level and normal CBC (complete blood count) parameters. So, you have to repeat the test (only liver function test) to see the bilirubin level and do peripheral blood smear to look for any hemolysis of RBC.
I hope you find this helpful.