Liley curve for evaluation of amnionic fluid bilirubin in Rh sensitized patient stas at: (A) 14weeks, (B) 16weeks, (C) 20weeks, (D) 26weeks
Answer is D. The main limitation of the liley curve is that it stas at 26weeks gestation and extrapolation of the lines to earlier gestational ages is inaccurate. Queenan has developed a curve for fetal assessment from 14-40weeks, divided into 4zones