Background and Importance According to the recommendations for the appropriate use of vitamin D tests and supplements in the general population published in 2021, several bulletins have been published as support tools in routine practice, the analysis carried out being variable.

Aim and Objectives Study of the consumption and prescriptions of vitamin D supplements alone in a social health centre.

Material and Methods Observational, retrospective study of the consumption of vitamin D supplements and cross-sectional analysis of current prescriptions for external intake of vitamin D. All patients institutionalised were included. The variables collected were: age, sex, posology of vitamin D, levels and whether they had: bone, kidney or both pathologies. The data were obtained from the inpatient management program and the computerised clinical history. For the analysis, we used the laboratory analytical parameters as a reference: deficiency (<10ng/dL), insufficiency (10–30 ng/dL), sufficiency (30–100 ng/dL) and toxicity (>100 ng/dL).

Results 300 residents were reviewed, of which 43.67% (131/300) were prescribed vitamin D, 32 men and 99 women, with a mean age of 84.4 years [52–102]. The distribution by posology was: monthly in 70.23% (92/131) residents, biweekly in 25.95% (34/131) residents, with the weekly regimen and every 10 days in 1.53% (2/131) residents, respectively and every 21 days only 0.76% (1/131) residents. According to laboratory data, 12 of them had deficiency (<10 ng/dL), 90 had insufficiency (10 ng/dL-30 ng/dL) and 27 had sufficiency (30 ng/dL-100 ng/dL).Regarding associated pathologies: 62 (47.33%) residents had bone pathology, 17 (12.98%) had kidney pathology, and both pathologies were present in eight (6.11%) of them. 39.69% (52/131) residents did not present any pathology related to vitamin D deficiency. In relation to the consumption of vitamin D:

Conclusion and Relevance The external supply of vitamin D is necessary in certain pathologies. However, this consumption has increased exponentially for no apparent reason other than the result of the levels of vitamin D in the tests. In view of the results obtained, it would be advisable to carry out periodic reviews of vitamin D supplementation in institutionalised patients, as well as consider deprescribing them if said contribution is unnecessary.

References and/or Acknowledgements 3.- chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/ https://www.euskadi.eus/contenidos/informacion/cevime_infac_2020/es_def/adjuntos/INFAC_Vol_28_1_Vitamina-D.pdf

Conflict of Interest No conflict of interest.