Vitamin D, 25 OH & 1-25 OH (codes 1115 + 1117)

Vitamin D test analyses total Vitamin D, Vitamin D2 and D3. The metabolite 25-hydroxyvitamin D is the major circulating form of Vitamin D in the body and the best indicator of a patient’s true vitamin status. Vitamin D is essential for the formation, growth, and repair of bones. Vitamin D is necessary for normal calcium absorption and immune function, maintaining the balance of calcium and phosphorus for bone mineralisation. Vitamin D plays a role in regulation of cell proliferation, cell differentiation and angiogenesis. It also improves muscle strength and helps reduce inflammation.

Vitamin D deficiency has been linked to increased risk for many common and serious diseases, including some common cancers, diabetes, cardiovascular disease, and osteoporosis.

The likelihood of vitamin D insufficiency is increased in malabsorption syndromes, ageing (elderly individuals have a reduced capacity for vitamin D3 formation), darker skin (higher concentrations of melanin reduce efficiency in vitamin D3 production), obesity (fat-soluble vitamin D is stored in adipose, which reduces bioavailability), and minimal sun exposure, such as in winter or at more northern latitudes.
Please note this is a blood draw sample that will be analysed in Nutripath Laboratory based in Australia, so may typically take 3-4 weeks for results turnaround to Dr Kathleen. A 1 hour first consultation is required for this test order. Please read preparation instructions carefully, and contact Nutrisearch, based in New Zealand, for any questions about taking the test: 0800 88 44 33.



View a sample report

Dr Kathleen’s tips about this test



Content and external links regarding products and services are intended as general practitioner and public reference. Online content is not a substitute for medical advice from a qualified health care professional and is no way intended for self-diagnosis, self-treatment, or cure to prevent any disease. Always consult a qualified health care professional. Do not postpone consultation with your health care professional because of information that you have read on this website. Always read the label of any supplements or natural health products you purchase and use only as directed. Consult a qualified health care professional if symptoms persist.

*Dr Kathleen is not a registered GP in New Zealand and as such does not act as your primary health provider.

Vitamin D, 25 OH & 1-25 OH (codes 1115 + 1117)

SKU Vitamin D (25 OH & 1-25 OH) Code 1115 + 1117 Serum Categories , Tags ,