Extraction protocols and representative miRNA yield from neonatal screening cards (NSC). (A) Flow diagram of 4 out of 11 extraction protocols performed. (B) Gel-like image for small RNA quality from 11 protocols for miRNA purification performed from dried blood samples on NSC. (C) Electropherogram from protocols 3 (purple), 4 (orange), 7 (magenta) and 8 (gold). (D) miRNA:small RNA ratio from NSC of normal (green), low body weight (red) and macrosomia (blue) neonates, horizontal line indicates the 0.35 threshold ratio, each bar represents an individual, n = 20. NBW, normal birth weight; LBM, low birth weight.