No needle stick or blood work is necessary for this testing. This is a non-invasive test which identifies lactose intolerance, fructose intolerance and bacterial overgrowth by measuring hydrogen in exhaled breath. These tests are completed in the office. Tthe fructose and lactose test are completed in about 20 minutes, the bacterial overgrowth test can take up to 3 hours to complete. Prep instructions are provided when the appointment is made.