Approx 23 years ago, I repeatedly tested positive for blood in urine, so I had
kidney x-rays, cystoscopy and various microhematuria tests. Everything proved negative, ... bought the urine chemstrips and noted that blood only showed after I drank coffee.... I again bought urine strips that detect blood only, and the strips shows non-hemolyzed trace only after drinking beer or coffee. If I drink a glass of water with a tsp of baking soda, the test strips come out negative.