FETAL BIOMETRY GUIDELINES

CONCLUSION

The performance and interpretation of fetal biometry is an important component of obstetric ultrasound practice. In fetuses for which gestational age has been established appropriately, measuring key biometric parameters, together with transformation of these measurements into EFW using one of the many validated formulae, permits detection and monitoring of small fetuses. Serial sonographic assessment of fetal size over time can provide useful information about growth, with the possibility of improving the prediction of SGA infants, particularly those at risk for morbidity. However, errors and approximations that may occur at each step of such a process greatly hamper our ability to detect abnormal growth, and most importantly FGR. Therefore, in clinical practice, fetal biometry should represent only one component of how we screen for abnormal growth. It is reasonable to believe that no single measurement, EFW formula or chart will significantly improve our current practices. Improved FGR screening may be feasible by using a combined approach that includes biometry as well as other clinical, biological and/or imaging markers. This goal will come within reach only when the ‘biometric component’ is better standardized for all those who care for pregnant women.