Urinalysis and Body Fluid Analysis Practice Quiz (10 questions)

1. The RACE fire-response sequence includes:

A. Rescuing anyone in immediate danger is the first action in the RACE response sequence.

B. Closing doors helps contain the fire during the RACE response sequence.

C. Opening doors to ventilate the area is the containment action in the RACE sequence.

D. Activating the alarm follows rescue in the RACE fire-response sequence.

E. Extinguishing the fire if possible or evacuating completes the RACE response sequence.

Answer: (A), (B), (D), (E)

Explanation

RACE begins with rescuing people in immediate danger, then activating the alarm, and containing the fire by closing doors. Opening doors is not the specified containment action; the sequence ends by extinguishing the fire if possible or evacuating.

2. What is the nephron’s role and basic composition?

A. The nephron is the kidney’s basic structural and functional unit, formed by a renal calyx and renal pelvis.

B. The nephron is the kidney’s basic functional unit, formed by a renal calyx and glomerulus.

C. The nephron includes a glomerulus together with renal tubules as its principal structural components.

D. The nephron is the kidney’s basic structural and functional unit, formed by a glomerulus and renal tubules.

E. The nephron is the kidney’s basic structural unit, formed by a renal pelvis and collecting duct.

Answer: (C), (D)

Explanation

The nephron is the kidney’s basic structural and functional unit and consists of a glomerulus and renal tubules. The alternatives substitute structures from the urine drainage pathway or omit the stated composition.

3. Regarding filtration at the glomerulus, which statements are accurate?

A. The negatively charged filtration barrier restricts albumin despite its size permitting passage.

B. The glomerulus filters plasma substances smaller than 70,000 daltons.

C. The glomerulus filters plasma substances smaller than 7,000 daltons.

D. Albumin is restricted because its molecular size prevents passage through the glomerular sieve.

E. The negatively charged filtration barrier promotes albumin passage into the filtrate.

Answer: (A), (B)

Explanation

The glomerulus filters plasma substances below 70,000 daltons, while the negatively charged barrier restricts albumin even though its size permits passage. The other statements alter the threshold, reverse the charge barrier’s effect, or wrongly attribute albumin restriction to molecular size.

4. What do concentration tests of renal function primarily assess?

A. Renal blood flow by measuring the volume entering the kidneys

B. Glomerular filtration by measuring the clearance of plasma substances

C. Urinary protein loss by measuring the amount of albumin excreted

D. Tubular reabsorption and the kidney’s ability to concentrate or dilute urine

Answer: (D)

Explanation

Concentration tests assess tubular reabsorption and how effectively the kidneys concentrate or dilute urine. Clearance tests, the most plausible alternative, evaluate glomerular filtration.

5. How soon after collection should urine be tested to minimize changes in the specimen?

A. Within four hours of collection

B. Within two hours of collection

C. Within six hours of collection

D. Within twelve hours of collection

Answer: (B)

Explanation

Testing urine within two hours helps preserve its characteristics for accurate analysis. The four-minute interval applies to checking the temperature of specimens collected for drug testing, not to routine urine testing.

6. What is the purpose of the urine reagent strip’s specific-gravity test?

A. To measure urine acidity using a pH indicator

B. To identify leukocytes by detecting their enzymes

C. To detect glucose through an enzyme-driven color reaction

D. To estimate the concentration of dissolved substances in urine

Answer: (D)

Explanation

Specific gravity provides an estimate of how concentrated urine is by reflecting the dissolved substances it contains. The glucose pad instead detects glucose through sequential glucose oxidase and peroxidase reactions.

7. In the characteristic heat test for urinary proteins, what happens after the specimen becomes cloudy at 40–60°C and then clears at 100°C?

A. The specimen remains clear while cooling and becomes cloudy only after reheating.

B. After hot filtration, turbidity reappears as the specimen cools below 20°C.

C. After hot filtration, turbidity reappears as the specimen cools through 40–60°C.

D. The specimen becomes cloudy during heating and remains cloudy after reaching 100°C.

Answer: (C)

Explanation

This sequence reflects the heat behavior of Bence-Jones proteins: turbidity appears at 40–60°C, clears at boiling, and returns on cooling through the lower temperature range after hot filtration. A specimen that stays clear while cooling does not show the characteristic sequence.

8. How do the urine glucose reagent strip and Clinitest differ in the substances they detect?

A. The strip detects non-reducing sugars, while Clinitest detects glucose only through a peroxidase reaction.

B. The strip uses glucose oxidase and peroxidase to detect glucose, while Clinitest detects several reducing sugars but not sucrose.

C. The strip detects glucose and sucrose, while Clinitest detects ketones and other products of fat metabolism.

D. The strip detects several reducing sugars, while Clinitest uses glucose oxidase and peroxidase to detect glucose.

Answer: (B)

Explanation

The reagent strip detects glucose through sequential glucose oxidase and peroxidase reactions, whereas Clinitest is a nonspecific copper-reduction test for reducing sugars such as glucose, galactose, lactose, and fructose. Clinitest does not detect sucrose because sucrose is a non-reducing sugar.

9. Which microscopy method is most useful for detecting birefringence and identifying cholesterol in oval fat bodies and fatty casts?

A. Bright-field microscopy

B. Polarizing microscopy

C. Fluorescence microscopy

D. Phase-contrast microscopy

Answer: (B)

Explanation

Polarizing microscopy reveals birefringence, which helps identify cholesterol in oval fat bodies and fatty casts. Phase-contrast microscopy instead enhances translucent elements such as casts.

10. Why do red blood cells crenate when exposed to hypertonic urine?

A. Water enters the cells because the urine has a lower solute concentration.

B. The cells swell as their membranes absorb urinary electrolytes.

C. Water leaves the cells because the urine has a higher solute concentration.

D. The cells lyse after losing their hemoglobin into the urine.

Answer: (C)

Explanation

Hypertonic urine draws water out of red blood cells, causing them to shrink and develop a crenated appearance. In hypotonic urine, red blood cells instead swell and may lyse.