Module 1 - GAP Theory
Module 2 - GAP Practice

3.8 Summary Points

  • Low risk: SFH 2-3 weekly from 26-28 weeks until delivery  
  • High risk or SFH not possible (see chapter 4): EFW 3 weekly until delivery
  • If 1st fundal height measurement is below the 10th centile line, or sequential measurements show slow growth, refer directly for an ultrasound scan
  • The scan should be carried out as early as possible, as per unit protocol. 
  • Ideally, 2 scans 3 weeks apart should be undertaken to check growth rate
  • If growth rate on scan is reassuring, continue SFHs, using previous last SFH as baseline 
  • Fundal height measurements above 90th centile line do not require referral to scan unless they show accelerated growth. Consider also referral for diabetes screening.