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. 2011 Apr 6;96(6):1835–1843. doi: 10.1210/jc.2010-1559

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Copyright © 2011 by The Endocrine Society

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Fig. 1. — The relationship between 25(OH)D and 1,25(OH)₂D is unique in cord blood compared with adults. Blood samples taken from cord blood and healthy adults donors had concentrations of 25(OH)D and 1,25(OH)₂D determined by RIA. Cord blood measurements of 25(OH)D and 1,25(OH)₂D demonstrated a strong correlation to each other (r = 0.78; P = 0.0001). This was in contrast to the lack of correlation between 25(OH)D and 1,25(OH)₂D in adult measurements where conversion of 25(OH)D to 1,25(OH)₂D is tightly regulated by PTH and renal 1α-hydroxylase.