Chapter 6 UA Quizs Fall 2025

Which protein is the reagent strip most sensitive for?

• Creatinine

• Albumin

• Globulin

• Hemoglobin

What principle does the nitrite pad use on urine strips?

• Griess reaction: bacterial reduction of nitrate to nitrite, then reaction with an aromatic amine forms azodye.

• Enzymatic hydrolysis of urea to ammonia and carbon dioxide.

• Colorimetric change due to pH alteration in the presence of glucose.

• Oxidation of bilirubin to biliverdin in acidic conditions.

Name two main causes of nondiabetic glycosuria.

• Hormonal disorders (e.g., Cushing's, hyperthyroidism) and renal tubular dysfunction.

• Dietary factors such as high sugar intake and dehydration.

• Genetic mutations affecting glucose metabolism and liver dysfunction.

• Infections of the urinary tract and excessive physical exercise.

What is the pseudoperoxidase principle in blood detection on strips?

• The heme component catalyzes the oxidation of a chromogen in the presence of peroxide.

• The heme component reduces a chromogen in the absence of oxygen.

• The heme component binds to glucose to form a colored complex.

• The heme component acts as a catalyst for the breakdown of hemoglobin.

What are the main clinical causes of ketonuria?

• Diabetes mellitus

• Dehydration

• Hypertension

• Excessive carbohydrate intake

List methods to protect reagent strips from deterioration.

• Store in opaque, tightly sealed containers with desiccant.

• Keep in direct sunlight to maintain temperature.

• Store in open containers to allow air circulation.

• Keep above 30°C to prevent moisture buildup.

Which errors in strip technique may lead to erroneous results?

• Leaving the strip in urine too long

• Using a different type of strip than recommended

• Not storing the strips in a cool place

• Failing to shake the strip before use

What is the main cause of a false-negative glucose strip result?

• Testing old specimens (bacterial breakdown of glucose).

• Improper storage of glucose strips.

• Using expired glucose strips.

• Inadequate sample size for testing.

Name sources of prerenal, renal, and postrenal proteinuria.

• Prerenal: multiple myeloma; Renal: glomerular damage; Postrenal: infections

• Prerenal: dehydration; Renal: diabetes; Postrenal: kidney stones

• Prerenal: multiple myeloma; Renal: glomerular/tubular damage, preeclampsia; Postrenal: infections, vaginal inflammation, prostatitis

• Prerenal: heart failure; Renal: hypertension; Postrenal: urinary retention

Which chemical tests on Multistix/Chemstrip use diazonium salts?

• Bilirubin, nitrite, leukocyte esterase

• Glucose, ketones, protein

• pH, specific gravity, urobilinogen

• Calcium, magnesium, chloride