Vitamin D Analyse

Standalone vitamin D blood test measuring 25-hydroxyvitamin D3, the standard marker for assessing vitamin D status. Relevant for bone health, immune function, mood regulation, and muscle performance. Particularly indicated in Central European latitudes where UV exposure is insufficient for adequate synthesis during autumn and winter months.

Vitamin D deficiency is one of the most common nutritional insufficiencies in Germany, with studies estimating that over half the population has suboptimal levels during the winter months. The 25-hydroxyvitamin D3 assay measures the circulating storage form of the vitamin, reflecting both dietary intake and endogenous skin synthesis from UV-B exposure over the preceding two to three weeks. Deficiency affects multiple systems beyond bone metabolism. Adequate vitamin D supports innate and adaptive immune responses, modulates inflammatory pathways, and influences neuromuscular function. Low levels are associated with increased susceptibility to respiratory infections, prolonged recovery from illness, and higher rates of seasonal affective symptoms. For physically active individuals, sufficient vitamin D is linked to improved muscle strength and reduced injury risk. The test requires a simple venous blood draw with no fasting necessary. Results are typically available within two to three working days. The physician interprets the result against current endocrine society reference ranges and advises on supplementation dosing if levels fall below the optimal threshold, taking into account the patient's baseline, body weight, and sun exposure patterns.