passages.id: split_6_test_302_passage
passages.type: progene_text
passages.text: The mean serum 25-hydroxyvitamin D [ 25(OH)D ] level was 3.9 +/- 1.2 ng / ml ( normal 15 to 30 ng / ml ) , whereas 1,25-dihydroxyvitamin D was 24 +/- 4.7 pg / ml ( normal 16 to 65 ) .