July 12, 20241 yr I found this reference: https://www.sciencedirect.com/science/article/pii/S0009898121004447 The given ref value for infants is wide, from 180-1400 picomol/L, the 50-percentile is in the range around 400 picomol/L. (the lines repr 2.5, 50 and 97.5 percentiles)
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