Densitometric analysis of amniotic fluid (AF) IGFBP-1 protein; The ratio of fragmented/intact IGFBP-1 was significantly higher in AF with inflammation than that in AF without inflammation (for total fragment: median 0.41 [range, 0.13–0.69] vs median 3.0 [range, 1.17–8.77]; for 21 kDa fragment: median 0.33 [range, 0.13–0.49] vs median 1.57, [range, 0.73–3.75]; for 17 kDa fragment: median 0.05 [range, 0.00–0.15] vs median 0.60, [range, 0.21–3.35]; for 12 kDa fragment: median 0.06 [range, 0.00–0.15] vs median 0.34, [range, 0.17–1.67]. P<0.001, respectively).
F/I ratio, IGFBP-1 protein fragmented/intact form ratio by densitometric analysis