Vitamin D is required for adequate calcium and phosphate metabolism, maintenance of bone structure, and maximum muscle function. Older adults, however, are at risk of inadequate vitamin D levels due to decreased skin synthesis, decreased metabolism in the kidneys, decreased gut absorption, and comorbid medical conditions. A person's vitamin D status is assessed by measuring the blood level of 25-hydroxyvitamin D. There is no generally accepted criterion for vitamin D deficiency and insufficiency. Serum 25OHD thresholds <25 nmol/l is defined as deficient, 25 - 50 nmol/l as insufficient, and >50 nmol/l as adequate for vitamin D. Vitamin D3 is recommended as the vitamin D preparation of choice for the treatment of vitamin D deficiency. Oral administration of vitamin D is recommended over intramuscular administration. A guideline for the treatment of vitamin D deficiency and insufficiency in older adults has been suggested. Compliance to prescribed medications is also a major factor for consideration in older adults. Individualized vitamin D therapy focusing on knowledge of the elderly and/or their carers about their medications and health may help improve adherence.
CITATION STYLE
Osuafor, C. N., MacMahon, M., McGreevy, C., & Fan, C. W. (2019). Vitamin d assessment in older adults. In Handbook of Famine, Starvation, and Nutrient Deprivation: From Biology to Policy (pp. 1683–1696). Springer International Publishing. https://doi.org/10.1007/978-3-319-55387-0_59
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