. The number of vitamin D tests requested by primary care, and the associated cost, is rapidly increasing. . More cases of vitamin D deficiency were detected each year, but the odds of detecting deficiency decreased. . Repeat tests form a significant proportion of total requests, and should be performed after three to six months. . Seasonal variation in vitamin D levels should always be considered when requesting tests and interpreting results. Clinicians should consider risk factors for vitamin D deficiency to ensure targeted testing of patients.
Why this matters to usThere is increasing awareness of the importance of vitamin D for maintaining musculoskeletal health by both the medical profession and the public. The number of requests for vitamin D testing from primary care is consequently increasing. Testing is expensive and can amount to a substantial financial burden, particularly if testing and retesting are performed inappropriately. There is a need to develop clear guidance for assessing vitamin D status in primary care. We believe our observations and recommendations will inform to improve the cost-effectiveness of vitamin D testing, its ability to influence management and thus make a real impact within primary care practice and patient care. Although this study was carried out in Liverpool, conclusions remain relevant to London given its greater black, Asian and minority ethnic population who are at increased risk of vitamin D deficiency.