Secondary hyperparathyroidism commonly develops in patients with chronic kidney disease (CKD) in response to high phosphate, low calcium and low 1α,25-dihydroxyvitamin D 3 (calcitriol) levels.

After, the liver converts that molecule into another type of vitamin D called 25-hydroxyvitamin D (calcidiol). And finally, the kidney transforms it to 1,25-dihydroxy vitamin D or (calcitriol ...

Two key tests help measure vitamin D levels: Vitamin D 25, Hydroxy and Vitamin D 1, 25 Dihydroxy. “The Vitamin D 25, Hydroxy test measures the most common form of vitamin D in the blood and is ...