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FL/AC (FEMUR LENGTH TO ABDOMINAL CIRCUMFERENCE RATIO) (3) Normal = 22 ± 2% (constant after 24 weeks). When ratio falls <20% or >24%, the AC should not be used in the assessment of gestational age. Growth retardation = >24%. Macrosomia = <20% (3). A comprehensive guide to understanding BPD, HC, AC, and FL at 23 weeks. Hopefully, this has cleared up any confusion and helped you feel more knowledgeable about your baby's development. Today, we're going to break down the normal ranges for four key measurements: BPD (Biparietal Diameter), HC (Head Circumference), AC (Abdominal Circumference), and FL (Femur Length). The normal range for BPD in pregnancy 29.4mm at 14 weeks, 49.4mm at 20 weeks, 78.4mm at 30 weeks, 91.5 at 37 weeks and 95.6mm at 40 weeks. If the BPD in pregnancy measurement is outside this range, it may indicate a problem with foetal growth or development problem.
