A screen pH paper is used to determine leukocyte, blood, nitrite and protein levels in the urine specimen obtained.
Leukocytes: This test reveals the presence of granulocyte esterases. Positive results produce a beige-pink to purple colour. The presence of leukocytes in urine are important signs of an inflammation of the kidneys and the urinary tract.
Blood: This test is based on the peroxidase-like activity of haemoglobin. The resulting colour ranges from orange to green to dark blue in positive tests.
Nitrite: This test depends upon the conversion of nitrate to nitrite by the action of Gram negative bacteria in the urine. Positive results produce a pink colour.
Protein: This reaction reveals pH indicator colours from yellow to green-blue for positive results. Protein in the urine may be found where there is inflammation of the bladder or prostate or bleeding in the urinary tract.
