Renal Function (BUN/Creatinine) Lab Interpretation Quiz

1. Which of the following would cause both BUN and creatinine to rise proportionally?

Liver disease

Chronic kidney disease

High protein diet

Muscle injury only

2. A 75-year-old with a creatinine of 1.1 mg/dL likely has reduced kidney function compared to a 30-year-old with the same value. Why?

Older adults have lower muscle mass and lower creatinine production

Age does not affect creatinine interpretation

Older adults always have kidney disease

Creatinine is invalid in patients over 70

3. Which lab value correlates most directly with muscle mass and dietary protein intake?

Creatinine

Cystatin C

GFR

Urine microalbumin

4. A patient with end-stage renal disease typically has a GFR of less than ____ mL/min/1.73m².

60

45

30

15

5. In acute kidney injury, creatinine may not rise immediately because it takes time to accumulate. How long does this typically take?

2–4 hours

6–12 hours

24–48 hours

72–96 hours

6. A patient has BUN 18 mg/dL and creatinine 1.8 mg/dL. The BUN:creatinine ratio is low. What does this indicate?

Prerenal azotemia

Intrinsic renal disease

Dehydration

Normal kidney function

7. Which ethnic group requires a different multiplier in the MDRD GFR equation?

Caucasian

Asian

African American

Hispanic

8. A patient on gentamicin therapy develops a creatinine rise from 0.8 to 1.6 mg/dL. What is the priority nursing action?

Continue gentamicin; recheck in 1 week

Notify the provider; monitor fluid balance

Increase fluid intake to 3 L/day

Administer sodium bicarbonate

9. Creatinine clearance is calculated using 24-hour urine collection. Which patient factor most affects accuracy?

Age of the patient

Completeness of urine collection

Time of day specimen collected

Patient's sodium intake

10. A young athlete has a baseline creatinine of 1.4 mg/dL due to high muscle mass. Is this abnormal?

Yes; all values above 1.0 indicate kidney disease

No; creatinine varies with muscle mass and age

Yes; requires immediate dialysis

No; only if accompanied by elevated BUN

11. A 65-year-old male presents with a BUN of 28 mg/dL and creatinine of 1.2 mg/dL. What is the BUN:creatinine ratio, and what does it suggest?

23:1; prerenal azotemia

18:1; intrinsic renal disease

15:1; postrenal obstruction

20:1; normal kidney function

12. A patient with diabetes has a creatinine of 1.4 mg/dL and a GFR of 52 mL/min/1.73m². What stage of CKD is this?

Stage 2

Stage 3a

Stage 3b

Stage 4

13. Which renal function parameter is most specific for glomerular filtration rate?

Blood urea nitrogen

Serum creatinine

Cystatin C

Uric acid

14. Normal serum creatinine in adults typically ranges from to mg/dL.

0.6–1.2

1.5–2.5

2.0–3.0

3.0–4.0

15. A post-operative patient has BUN 32 mg/dL, creatinine 0.9 mg/dL, and urine output 250 mL/24 hours. What should the nurse suspect?

Intrinsic acute tubular necrosis

Prerenal azotemia from hypovolemia

Postrenal obstruction

Chronic glomerulonephritis

16. Which medication is most likely to cause acute kidney injury by increasing creatinine levels?

ACE inhibitors in volume-depleted states

Acetaminophen

Aspirin for headache

Omeprazole

17. A patient with a BUN of 45 mg/dL and creatinine of 8.0 mg/dL most likely has what stage of chronic kidney disease?

Stage 2

Stage 3b

Stage 4

Stage 5

18. Calculate the approximate GFR using the MDRD equation for a 50-year-old African American female with creatinine 1.8 mg/dL.

28 mL/min/1.73m²

42 mL/min/1.73m²

55 mL/min/1.73m²

68 mL/min/1.73m²

19. A patient's creatinine rises from 1.0 to 2.5 mg/dL over 48 hours. What is the most likely diagnosis?

Chronic kidney disease

Acute kidney injury

End-stage renal disease

Diabetic nephropathy

20. Which of the following conditions would cause an elevated BUN with a normal creatinine level?

Chronic kidney disease stage 3

Dehydration or gastrointestinal bleeding

Advanced cirrhosis

Rhabdomyolysis

Renal Lab Quiz: Can You Read Kidney Function?

1. Which of the following would cause both BUN and creatinine to rise proportionally?

2.

What first name or nickname would you like us to use?

2. A 75-year-old with a creatinine of 1.1 mg/dL likely has reduced kidney function compared to a 30-year-old with the same value. Why?

3. Which lab value correlates most directly with muscle mass and dietary protein intake?

4. A patient with end-stage renal disease typically has a GFR of less than ____ mL/min/1.73m².

5. In acute kidney injury, creatinine may not rise immediately because it takes time to accumulate. How long does this typically take?

6. A patient has BUN 18 mg/dL and creatinine 1.8 mg/dL. The BUN:creatinine ratio is low. What does this indicate?

7. Which ethnic group requires a different multiplier in the MDRD GFR equation?

8. A patient on gentamicin therapy develops a creatinine rise from 0.8 to 1.6 mg/dL. What is the priority nursing action?

9. Creatinine clearance is calculated using 24-hour urine collection. Which patient factor most affects accuracy?

10. A young athlete has a baseline creatinine of 1.4 mg/dL due to high muscle mass. Is this abnormal?

11. A 65-year-old male presents with a BUN of 28 mg/dL and creatinine of 1.2 mg/dL. What is the BUN:creatinine ratio, and what does it suggest?

12. A patient with diabetes has a creatinine of 1.4 mg/dL and a GFR of 52 mL/min/1.73m². What stage of CKD is this?

13. Which renal function parameter is most specific for glomerular filtration rate?

14. Normal serum creatinine in adults typically ranges from to mg/dL.

15. A post-operative patient has BUN 32 mg/dL, creatinine 0.9 mg/dL, and urine output 250 mL/24 hours. What should the nurse suspect?

16. Which medication is most likely to cause acute kidney injury by increasing creatinine levels?

17. A patient with a BUN of 45 mg/dL and creatinine of 8.0 mg/dL most likely has what stage of chronic kidney disease?

18. Calculate the approximate GFR using the MDRD equation for a 50-year-old African American female with creatinine 1.8 mg/dL.

19. A patient's creatinine rises from 1.0 to 2.5 mg/dL over 48 hours. What is the most likely diagnosis?

20. Which of the following conditions would cause an elevated BUN with a normal creatinine level?

Renal Lab Quiz: Can You Read Kidney Function?

1. Which of the following would cause both BUN and creatinine to rise proportionally?

2.

What first name or nickname would you like us to use?

2. A 75-year-old with a creatinine of 1.1 mg/dL likely has reduced kidney function compared to a 30-year-old with the same value. Why?

3. Which lab value correlates most directly with muscle mass and dietary protein intake?

4. A patient with end-stage renal disease typically has a GFR of less than ____ mL/min/1.73m².

5. In acute kidney injury, creatinine may not rise immediately because it takes time to accumulate. How long does this typically take?

6. A patient has BUN 18 mg/dL and creatinine 1.8 mg/dL. The BUN:creatinine ratio is low. What does this indicate?

7. Which ethnic group requires a different multiplier in the MDRD GFR equation?

8. A patient on gentamicin therapy develops a creatinine rise from 0.8 to 1.6 mg/dL. What is the priority nursing action?

9. Creatinine clearance is calculated using 24-hour urine collection. Which patient factor most affects accuracy?

10. A young athlete has a baseline creatinine of 1.4 mg/dL due to high muscle mass. Is this abnormal?

11. A 65-year-old male presents with a BUN of 28 mg/dL and creatinine of 1.2 mg/dL. What is the BUN:creatinine ratio, and what does it suggest?

12. A patient with diabetes has a creatinine of 1.4 mg/dL and a GFR of 52 mL/min/1.73m². What stage of CKD is this?

13. Which renal function parameter is most specific for glomerular filtration rate?

14. Normal serum creatinine in adults typically ranges from ____ to ____ mg/dL.

15. A post-operative patient has BUN 32 mg/dL, creatinine 0.9 mg/dL, and urine output 250 mL/24 hours. What should the nurse suspect?

16. Which medication is most likely to cause acute kidney injury by increasing creatinine levels?

17. A patient with a BUN of 45 mg/dL and creatinine of 8.0 mg/dL most likely has what stage of chronic kidney disease?

18. Calculate the approximate GFR using the MDRD equation for a 50-year-old African American female with creatinine 1.8 mg/dL.

19. A patient's creatinine rises from 1.0 to 2.5 mg/dL over 48 hours. What is the most likely diagnosis?

20. Which of the following conditions would cause an elevated BUN with a normal creatinine level?

14. Normal serum creatinine in adults typically ranges from to mg/dL.