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Don't routinely test vitamin D levels (25-hydroxyvitamin D) in asymptomatic adults without a specific risk factor or indication. Setting: asymptomatic adult with no specific risk factor or indication for vitamin D deficiency (e.g. malabsorption, chronic kidney disease, osteoporosis or fragility fracture, medications affecting vitamin D metabolism) Why: Population vitamin D testing in asymptomatic adults is high-volume and low-yield; results rarely change management compared with empiric advice. Consider instead: lifestyle advice and empiric supplementation where appropriate; reserve testing for patients with a specific indication Source: Endocrine Society (Choosing Wisely, US, 2024).