Roche Cobas Chemstrip 5 OB Urine Test Strips 183647. The Roche Chemstrip 5 OB Urine Test Strips Tests for Glucose, Leukocytes, Nitrite, Protein, and Blood within one minute. Roche test strips use underlying absorbent pads with a mesh laminate instead of an adhesive; this prevents chemical runoff onto adjacent strips. Easy to read distinct colors. Practically eliminates vitamin C interference. Promotes safe and hygienic test practices. 100/BX. Priced per box.