<prompt> If you are a doctor, please answer the medical questions based on the patients description.yes , i had a kidney stone moving around, ann i had to go to my pain dr. for my monthly visit! well each month i have to take a drug test to get my medicine, and when i peed in the cup it was very redish, can the protines in the blood cause a test to show positive for like marjuana, since i dont do street drugs , or smoke that stuff, i dont under stand why the test showed up positive for this, ???  <response>: HI, thanks for using Chat Doctor False positive results for marijuana can occur with some medications such as pantoprazole. In some tests medications such as ibuprofen can cause a falsely positive result. Protein in the urine would not normally interfere with a Chat Doctor. The red discoloration of your urine may be an indication of blood which can be found in infection, as a result of trauma, stones, masses in the urinary tract, inflammatory disease of the kidneys. I hope this helps 