Check your knowledge

1. Which ONE of the following is the most common cause of polyuria?

a. Adrenal insufficiency

b. Acute kidney injury

c. Cushing’s syndrome

d. Diabetes mellitus

e. Hyperthyroidism

2. What is the daily adult urine output threshold (UK values) typically used to define polyuria in adults?

a. 500ml

b. 1,000ml

c. 2,500ml

d. 3,000ml

e. 5,000ml

3. Which ONE of the following hormone deficiencies is most closely associated with central diabetes insipidus? 

a. Aldosterone

b. Antidiuretic hormone

c. Cortisol

d. Insulin

e. Parathyroid hormone

4. In the diagnostic evaluation of polyuria, which ONE of the following tests is most appropriate to differentiate between diabetes mellitus and diabetes insipidus?

a. Blood urea nitrogen test

b. Serum glucose level

c. Serum potassium level

d. Serum sodium level

e. Water deprivation test

5. Which ONE of the following would most likely cause polyuria with a concurrent increase in thirst?

a. Diabetes insipidus

b. Heart failure

c. Hyperaldosteronism

d. Hyponatremia

e. Urinary tract infection

Answers

1.d 2.d 3.b 4.e 5.a