Vitamin D Blood Test

An expanded vitamin D assessment that goes beyond the basic 25-OH D measurement to include related markers that provide context for bone health, calcium metabolism, and immune function. Covers 12 biomarkers for a more complete picture of how vitamin D is functioning in your body — not just whether levels are adequate but how they interact with calcium, phosphate, and parathyroid hormone regulation.

This expanded vitamin D assessment goes beyond the basic 25-hydroxyvitamin D measurement to include 12 related markers that provide context for how vitamin D functions within your body. Vitamin D deficiency affects an estimated 1 in 4 Australians — surprisingly high for a sun-rich country — driven by indoor lifestyles, sunscreen use, and geographic latitude in southern states. The panel measures 25-hydroxyvitamin D (the storage form and primary clinical marker), along with calcium, phosphate, and related metabolic markers that reveal whether vitamin D is doing its job. Adequate vitamin D levels mean little if calcium absorption is impaired or parathyroid hormone is compensating for a functional deficiency. This broader view catches problems that a single vitamin D number would miss. Vitamin D is technically a hormone precursor, not a vitamin. It regulates calcium absorption, bone mineralisation, immune function, mood, and gene expression in virtually every tissue. Research links deficiency to increased risk of autoimmune disease, depression, cardiovascular events, and certain cancers. Optimal levels for health and longevity are debated, but most functional practitioners target 100-150 nmol/L — well above the conventional lower limit of 50 nmol/L. No fasting or special preparation is needed. Results arrive within 2-3 business days through the ClearLabs digital dashboard, with optimal ranges and the ability to track changes over time. ClearLabs operates through over 2,000 NATA-accredited collection centres across Australia, so there is likely a location within a short drive of your home or workplace.