A patient passes very large volumes of dilute urine but the urine contains no glucose. The most likely condition is
Correct answer: D. diabetes insipidus
- A. diabetes mellitus
- B. kidney stones
- C. a urinary tract infection
- D. diabetes insipidus
Explanation
Diabetes insipidus results from a lack of ADH or a failure of the tubule to respond to it, so water cannot be reabsorbed and the patient produces litres of dilute, sugar free urine and is constantly thirsty. Diabetes mellitus also causes a large urine volume, but there the cause is unreabsorbed glucose holding water in the tubule, so glucose is present. The word diabetes simply means a large flow.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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