The Combur-9 test is a detection method for leukocytes, nitrite, pH, protein, glucose, ketone, urobilinogen, bilirubin and blood in the urine. The manufacturer shall specify "For the professional use", the implementation is, however, simply in compliance with the instructions for use even for the novice. The interpretation of pathological findings - that all color changes that do not meet the respective first swatch - then of course requires medical expertise.