Chemical Exam for Urinalysis

A reagent strip provides a simple and rapid means for performing routine chemical tests on urine by using chemical-impregnated absorbent pads on a plastic strip. How is the interpretation of the chemical reaction made?

• By measuring the light absorption intensity using a spectrophotometer.

• By comparing the resulting color to the manufacturer's color chart.

• By determining the pH of the urine specimen.

• By noting the time taken for the color change to occur.

Which list includes all ten of the standard test pads found on a routine urinalysis reagent strip?

• pH, protein, glucose, ketones, occult blood, bilirubin, urobilin, albumin, nitrite, leukocyte esterase.

• pH, albumin, sugar, ketones, blood, bilirubin, urobilinogen, nitrite, leukocyte esterase, refractivity.

• pH, Protein, Glucose, Ketones, Blood, Bilirubin, Urobilinogen, Nitrate, Leukocyte esterase, Specific gravity.

• pH, protein, sugar, cholesterol, occult blood, bilirubin, urobilinogen, nitrite, leukocyte esterase, specific gravity.

To prevent runover between chemicals on adjacent pads, what critical step must be performed immediately after withdrawing the strip from the urine specimen?

• Wait 60 seconds before reading the first test.

• Allow the strip to soak for at least 10 seconds.

• Blot the edge of the strip on an absorbent pad.

• Add a drop of distilled water to the strip.

Reagent strips must be stored properly to maintain their integrity. Which condition should be avoided during storage?

• Storing them in the bottle with the lid closed.

• Storing them at room temperature.

• Exposure to moisture or volatile substances.

• Running positive and negative controls daily.

The reagent strip test for Specific Gravity (SG) is based on what principle?

• The concentration of glucose and urea in the sample.

• The reduction of cupric ions by reducing substances.

• The pH change of pretreated polyelectrodes in relation to ionic concentration.

• The precipitation of protein in an acid medium.

What indicator is used in the Specific Gravity reagent strip test?

• Methyl Red

• Tetrabromphenol Blue

• Sodium Nitroprusside

• Bromthymol Blue

If a patient’s urine pH is persistently alkaline, which condition might be indicated?

• Dehydration.

• High Protein diet.

• Urinary tract infections.

• Gout.

The pH reagent strip test uses a double-indicator system composed of two indicators. Which pH range is covered by the methyl red indicator?

• 6-9 (green to blue)

• 5.0-8.5 (acid to alkaline)

• 4-6 (orange to yellow)

• 7-9 (yellow to orange)

Proteinuria is considered the most indicative sign of:

• Urinary tract infection.

• Diabetes mellitus.

• Renal disease.

• Hemolytic disorders.

The normal renal threshold for protein excretion is generally considered to be:

• < 150 mg/dL.

• 100-150 mg/24 hours.

• < 10 mg/dL or 100 mg/24 hours.

• 30-300 mg/24 hours.