Determinación de los niveles séricos de 25-hidroxivitamina D y sus variaciones estacionales en una población normal joven / Determination of 25-hydroxyvitamin D serum levels and its seasonal variations in a healthy young population

ABSTRACT

25-hydroxyvitamin D has a longer half life and its serum levels have less daily variations than calcitrol. Thus, its measurement is a better indicator of vitamin D status. Vitamin D was measured using a competitive protein binding radioassay in 61 subjects (27 males) aged 21 to 57 years old, during july to august (winter) and february and march of the next year (summer). 25-hydroxyvitamin levels were 28.8ñ1.5 and 30.9ñ2.3 ng/ml during winter and summer respectively. No differences were found between men and women. Ninety five percent confidence levels were between 13 and 50 ng/ml. Levels in 1 patient with malabsorption were 9.3 ng/ml, in 2 patients with hypophosphemic osteomalacia were 2.1 and 9.3 ng/ml, in 12 patients with alcoholic cirrhosis were 16.4ñ1.3 ng/ml, in 4 patients with primary osteoporosis were 23.3ñ0.7 and in 3 patients receiving vitamin D were 334ñ33.2 ng/ml. Normal levels of 25-hydroxyvitamin D range from 13 to 50 ng/ml in normal adults, there are no differences between men and women and seasonal variations are minimal