A nurse is caring for a client who has a new diagnosis of urolithiasis. Which of the following should the nurse identify as an associated risk factor?

Choice A reason: Diuretic use can sometimes increase the risk of electrolyte imbalances, but it is not a primary risk factor for urolithiasis. In fact, certain diuretics, such as thiazides, are used therapeutically to reduce calcium excretion and prevent stone formation. Therefore, diuretic use is not considered a direct risk factor. Choice B reason: A BMI less than 25 indicates a normal or healthy weight. Obesity is more commonly associated with metabolic changes that predispose individuals to stone formation, but a normal BMI does not increase risk. Thus, this option is not correct. Choice C reason: Family history is a well-established risk factor for urolithiasis. Genetic predisposition plays a significant role in stone formation, as inherited metabolic abnormalities can increase urinary excretion of stone-forming substances such as calcium, oxalate, or uric acid. Individuals with a family history of kidney stones are at significantly higher risk of developing them themselves. This is the correct answer. Choice D reason: Hypocalcemia is not a risk factor for urolithiasis. Stones are often composed of calcium oxalate or calcium phosphate, and hypercalciuria (excess calcium in urine) is a risk factor. Hypocalcemia, on the other hand, indicates low serum calcium levels and does not contribute to stone formation.