Urine Test for Lactose Tolerance is a type of lactose tolerance test, the procedure usually takes about 1 hour and the results are usually available after 4 to 5 hours or the next day. Urine test for lactose tolerance is one of the laboratory tests to diagnose intestinal lactase deficiency. It is performed by taking ethanol orally after 12 hours of fasting, then lactose orally 10 minutes later, and then blood and urine specimens again 40 minutes later to test galactose concentration. If the elevated blood galactose concentration is less than 0.3 mmol/L and the elevated urinary galactose concentration is more than 0.3 mmol/L and less than 2 mmol/L, it suggests lactase deficiency. The classic lactose tolerance test has been replaced by the simple and sensitive hydrogen breath test, as the results are influenced by a variety of factors and can show false positives or false negatives. Urine testing for lactose tolerance has also been restricted in use due to the need for quantitative ethanol intake. If symptoms of lactose intolerance such as belching (burping), bowel movements, diarrhea, abdominal pain, etc. occur after consuming dairy products, it is recommended to seek medical attention as soon as possible to confirm the diagnosis.