Diagnos Urinalysis Reagent Strips(10A)

The performance characteristics of Reagent Strips for Urinalysis (URS) have 
been determined both in the laboratory and in clinical tests. Parameters of 
importance to the user are sensitivity, specificity, accuracy, and precision. 
Generally, Urine Reagent Strips (URS) have been developed to be specific for 
the constituent to be measured with the exception of interferences listed above. 
(See LIMITATIONS OF PROCEDURE)
For visually read strips, accuracy is a function of the manner in which the color 
blocks on the color chart are determined and the discrimination of the human eye 
in reading the test. Precision is difficult to assess in a test of this type because of 
the variability of the human eye.
Glucose: This test is specific for glucose; no substances excreted in urine other 
than glucose is known to give a positive result. The reagent area does not react 
with lactose, galactose, fructose, or reducing metabolites of drugs; e.g. 
salicylates and nalidixic acid. This test may be used to determine whether the 
reducing substances found in urine is glucose.
Bilirubin: The test is considered specific for bilirubin in urine. 
Ketone: The ketone test area provides semi-quantitative results and reacts with 
acetoacetic acid in urine. This test does not react with beta-hydroxybutyric acid 
or acetone. 
Specific Gravity: The specific gravity test permits determination of urine specific 
gravity between 1.000 and 1.030. In general, the specific gravity test correlates 
within 0.005 with values obtained with the reflective index method

Blood: This test is slightly more sensitive to free hemoglobin and myoglobin 
than to intact erythrocytes.
pH: The pH test area permits quantitative differentiation of pH values to one unit 
within the range of 5-9. pH reading is not affected by variation in the urinary 
buffer concentration.
Protein: The test area is more sensitive to albumin than to globulin, hemoglobin, 
Bence-Jones proteins, and mucoprotein; a negative result does not rule out the 
presence of these other proteins. 
Urobilinogen: The absence of urobilinogen in the specimen being tested cannot 
be determined with this test.
Nitrite: Comparison of the reacted reagent area on a white background may aid 
in the detection of low levels of nitrite ion, which may otherwise be missed. This 
test is specific for nitrite and will not react with substances normally excreted in 
the urine.
Leukocytes: This test will not react with erythrocytes or bacteria common in 
urine.
Ascorbic Acid: This test can detect ascorbic acid in concentrations as low as 
0.6 mmol.L^-1in urine.