Vitamin D Test

Measures 25-hydroxyvitamin D — the circulating form your body uses for bone health, immune function, mood regulation, and muscle performance. Vitamin D deficiency affects up to 1 in 4 Australian adults despite abundant sunshine, driven by indoor lifestyles, sunscreen use, and darker skin tones. This affordable single-marker test provides the data point that informs whether supplementation is needed and at what dose.

Vitamin D is technically a hormone, not a vitamin, and its receptors are found in virtually every tissue in the body — from bone and muscle to brain and immune cells. The 25-hydroxyvitamin D test measures the storage form that your liver produces from sun exposure or dietary intake, providing the most accurate picture of your vitamin D status. Deficiency (below 50 nmol/L) is associated with increased fracture risk, impaired immune function, seasonal mood disorders, muscle weakness, and higher all-cause mortality. Insufficiency (50-75 nmol/L) is even more common and still associated with suboptimal health outcomes. Optimal levels for longevity are generally considered to be 75-150 nmol/L. Australians are particularly susceptible to deficiency during winter months (May-August), but year-round deficiency is common in office workers, those who cover up for cultural or skin cancer prevention reasons, and people with darker skin. ClearLabs delivers results through their digital dashboard with optimal ranges — not just the broad pathology reference range — helping you understand whether your level is adequate or merely 'not deficient.'