Friday, Jul 24, 2026 The claims desk. Receipts included. POWERED BY LENZ ↗
IsThis

HEALTH

The Claim

Ultrasound estimated fetal weight has a specific diagnostic accuracy in detecting fetal growth restriction.

Verified by Lenz ·

The Short Version

Multiple peer-reviewed systematic reviews and meta-analyses have quantified the diagnostic accuracy of ultrasound estimated fetal weight for detecting fetal growth restriction, with reported sensitivities ranging from ~23% to 89% and specificities from 88% to 99.5%. These metrics are well-documented and reproducible, confirming that specific diagnostic accuracy exists. However, performance varies substantially by gestational age, threshold, and how FGR is defined, and significant measurement errors affect real-world reliability — meaning no single, universal accuracy figure applies.

Caveats

  • Diagnostic accuracy metrics vary widely by gestational age and threshold (e.g., sensitivity of 71% at 32 weeks vs. 48% at 36 weeks), so no single 'specific' figure is universally applicable.
  • Ultrasound EFW measures fetal size rather than true growth restriction, and there is no universally accepted gold standard for FGR diagnosis, making reported accuracy figures dependent on how FGR is defined.
  • Significant systematic and random measurement errors exist in EFW (mean systematic difference of 8.4%, range −17.5% to 38.3%), and EFW tends to overestimate weight in small fetuses — the very population relevant to FGR detection.

The Receipts

  1. Effectiveness of Risk Stratification for Fetal Growth Restriction at Routine Antenatal Ultrasound Assessment at 11-14 Gestation Weeks in a Rural Population of Western India - PubMed

    PubMed

  2. The accuracy of ultrasound estimation of fetal weight in comparison to birth weight in a Danish hospital cohort

    PubMed Central

  3. An evaluation of systematic and random errors in ultrasound estimated fetal weight in high-risk pregnancies for fetal growth restriction

    PubMed Central

  4. Diagnostic performance of 32 vs 36 weeks ultrasound in predicting late-onset fetal growth restriction and small-for-gestational-age neonates: a systematic review and meta-analysis - PubMed

    PubMed

  5. Diagnostic performance of third-trimester ultrasound for the prediction of late-onset fetal growth restriction: a systematic review and meta-analysis - PubMed

    PubMed

  6. Comparative Diagnostic Performance of Estimated Fetal Weight and Isolated Abdominal Circumference for the Detection of Fetal Growth Restriction - PMC

    PMC

  7. Early identification of fetal growth restriction using ultrasound biometrics and biochemical markers: a comprehensive diagnostic approach - PMC

    PMC

  8. An evaluation of systematic and random errors in ultrasound estimated fetal weight during serial ultrasound - PMC

    PMC

  9. The accuracy of ultrasound estimation of fetal weight in comparison to birth weight: A systematic review - PMC

    PMC

  10. Intrauterine Growth Restriction (IUGR) Imaging: Practice Essentials, Ultrasonography

    eMedicine

+ 10 more sources — see the full list on Lenz

Filed Under

Fetal Growth RestrictionUltrasound Estimated Fetal Weight