Is it possible for a doctor do a blood test to detect lactose intolerance?

Yes, lactose test.: Lactose intolerance is a disease associated with the ingestion of different types of carbohydrates. The main symptoms are diarrhea, abdominal bloating 20-30 min. Of ingestion of carbohydrate. The test done for diagnosis is the lactose tolerance test: ingestion of 50 g of lactose and the subsequent diarrhea, determination of glucose in blood shows elevation of no more than 20 mg. Hydrogen test also.