Vitamin D Plus Blood Test

The Vitamin D Plus Blood Test measures total 25-hydroxyvitamin D [25(OH)D] and additional vitamin D metabolites to assess vitamin D status and metabolic processing using a simple at-home dried blood spot sample.

Vitamin D is a fat-soluble hormone precursor that plays a central role in calcium regulation, bone metabolism, immune function, muscle performance, and endocrine balance. After sunlight exposure or dietary intake, vitamin D must be absorbed and converted in the liver and kidneys into active forms that regulate numerous physiological processes. Measuring only total vitamin D may not always provide a complete picture of vitamin D metabolism.

The Vitamin D Plus Blood Test provides deeper insight into vitamin D utilisation by assessing total 25(OH)D along with additional metabolites involved in vitamin D processing. This allows evaluation of overall status as well as potential inefficiencies in absorption or conversion. Suboptimal vitamin D levels are common, even in individuals who supplement regularly.

Monitoring vitamin D metabolism can be particularly valuable for individuals focused on immune resilience, bone density, cardiovascular health, athletic performance, and longevity strategies. It may also support evidence-based decisions around supplementation dosage and optimisation.

All samples from the Vitamin D Plus Blood Test are analysed in certified laboratories and include clear reference ranges to support informed health decisions. This advanced at-home Vitamin D Plus Blood Test provides a comprehensive evaluation of vitamin D status and metabolic balance.