25-Hydroxy Vitamin D EIA, Catalog #AC-57F1. || Product Usage: The IDS 25-Hydroxy Vitamin D EIA kit is an enzymeimmunoassay intended for the quantitative determination of 25-hydroxyvitamin D (25-OH D) and other hydroxylated metabolites in human serum or plasma. Results are to be used in conjunction with other clinical and laboratory data to assist the clinician in the assessment of vitamin D sufficiency in adult populations.