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Vitamin D Blood Test

Type

Blood Testing

Biomarkers

11

Duration

10 min

Results

3 days

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.

Key Details

Markers
12
Focus
Vitamin D + bone health
Collection fee
+A$20

Who Is This For?

Comprehensive vitamin D assessment, bone health screening, osteoporosis risk, supplement monitoring

What's Included

25-hydroxyvitamin D
Calcium
Phosphate
Related metabolic markers

Preparation Required

No fasting or preparation required.

Panel Categories

Vitamin and Nutrient Panel Anti-Aging & Longevity Panel Bone Health Panel Sports Performance Panel

Biomarkers Tested

11
Copper µg/dL

A trace mineral essential for iron metabolism, connective tissue formation, and antioxidant defense. The copper/zinc ratio is an emerging marker of inflammation and oxidative stress. Both deficiency and excess can cause problems.

Folate (Vitamin B9) ng/mL

Essential for DNA synthesis, cell division, and red blood cell formation. Folate deficiency causes megaloblastic anemia and, during pregnancy, increases the risk of neural tube defects. Works closely with vitamin B12.

Magnesium mg/dL

Involved in over 300 enzymatic reactions including energy production, muscle function, and nerve signaling. Magnesium deficiency is common and associated with muscle cramps, anxiety, insomnia, and increased cardiovascular risk.

Selenium µg/L

A trace mineral crucial for thyroid hormone metabolism, antioxidant defense (via selenoproteins), and immune function. Selenium deficiency can impair thyroid function and increase susceptibility to viral infections.

Vitamin A (Retinol) µg/dL

A fat-soluble vitamin essential for vision, immune function, skin health, and cell growth. Both deficiency and excess can cause health problems. Levels are tightly regulated by the liver.

Vitamin B12 pg/mL

Essential for nerve function, DNA synthesis, and red blood cell formation. B12 deficiency can cause anemia, neuropathy, fatigue, and cognitive impairment. Common in vegans, vegetarians, older adults, and those taking metformin or acid-reducing medications.

Vitamin C mg/dL

A powerful water-soluble antioxidant essential for collagen synthesis, immune function, and iron absorption. Vitamin C deficiency causes scurvy. It also supports wound healing and protects against oxidative stress.

Vitamin D (25-OHD) ng/mL

The best indicator of overall vitamin D status. Vitamin D is essential for calcium absorption, bone health, immune function, and mood regulation. Deficiency is extremely common, especially in northern latitudes, and linked to increased disease risk.

Vitamin E mg/L

A fat-soluble antioxidant that protects cell membranes from oxidative damage. Vitamin E works synergistically with vitamin C and selenium. Deficiency is rare but can cause nerve and muscle damage.

Vitamin K ng/mL

Essential for blood clotting and bone metabolism. Vitamin K activates proteins needed for blood coagulation and calcium regulation in bones. Deficiency increases bleeding risk and may contribute to osteoporosis.

Zinc µg/dL

An essential trace mineral involved in immune function, wound healing, DNA synthesis, and testosterone production. Zinc deficiency impairs immune response, delays wound healing, and can cause hair loss and taste changes.

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