Question: what is the difference between vitamin d deficiency and insufficiency?
Answer: Normal values are 75-100 nmol/L (30-40 ng/ml). Vitamin D deficiency is defined if serum hydroxyvitamin D levels are less than 50nmol/L (20 ng/ml), insufficiency as 50-75 nmol/L (20-30 ng/ml). Studies demonstrate that vitamin D is essential also for overall health and well-being.