<prompt> A child presents with complaints of oliguria, abdominal distension and diarrhoea. On examination, there is deep jaundice. Hepatomegaly was present measuring 4 cm below the costal margin. Conjugated bilirubin of the following tests is of least importance toin blood was 38 mgdL, and there was urine urobilinogen and bile pigments. Hemoglobin was 4mgdL, and serum creatinine was 3mgdL. Which diagnose this case -G6PD level in bloodSerum ceruloplasminReticulocyte countLeptospiral antibody level  <response>: Serum ceruloplasmin measurement is useful in the diagnosis of Wilsons disease, but Wilsons disease in the above patient can easily be ruled out because in Wilsons disease there is no renal involvement, whereas the patient in question is having renal involvement Serum Creatinine 3 mgdL.Leptospiral antibody levelLeptospiral antibody measurement is useful in the diagnosis of leptospirosis.The symptomatic profile of the patient is very similar to that of severe leptospirosis Weils syndrome.CF of Wells syndrome Jaundice Hemolysis Renal failure During 2nd wk.Hemorrhagic diathesisHepatomegaly RhabdomyolysisSpleenomegaly Congestive heart failure Pulmonary involvementG-6PD level -During G-6 PD deficiency hemolysis occurs which can give rise to unconjugated bilirubinemia.The patient is giving evidence of unconjugated hyperbilirubinemia. So G-6PD level can be checked to find out the cause of unconjugated hyperbilirubinemia.Reticulocyte count - The reticulocyte count is done to check whether the patient is suffering from any hemolytic anaemia which can be a cause of unconjugated bilirubinemia. 