OBJECTIVES: To evaluate the applicability of the INTERGROWTH‑21st prescriptive fetal growth standards for third‑trimester biometry and estimated fetal weight (EFW) assessment in a Polish population. MATERIAL AND METHODS: This retrospective single-center cohort study included 594 uncomplicated singleton pregnancies with reliable first‑trimester crown rump length dating and one routine third‑trimester ultrasound performed at a tertiary center in Poland (2014-2021). Standard biometry and EFW were obtained per international guidelines, and EFW was calculated using the INTERGROWTH‑21st formula. Z‑scores and centiles were derived from INTERGROWTH‑21st standards. EFW Z‑scores were grouped into 97th centile categories; observed vs expected proportions (3%, 7%, 80%, 7%, 3%) were compared using the chi‑square test. RESULTS: Mean Z‑scores approximated zero for all parameters (HC 0.00 ± 1.01, AC 0.00 ± 1.02, FL 0.00 ± 1.08, BPD 0.00 ± 1.01, EFW 0.00 ± 0.93); 95% confidence intervals included zero, indicating minimal bias. For EFW, proportions were 1.0%, 4.7%, 85.2%, 6.2%, and 2.9%, respectively, significantly deviating from the theoretical distribution (χ² = 14.8, df = 4). CONCLUSIONS: Third trimester fetal size in low‑risk Polish pregnancies is well described by the INTERGROWTH‑21st standards regarding central tendencies. A slight underrepresentation of fetuses at the extremes suggests mild compression, warranting local audit and linking of centiles with perinatal outcomes to refine diagnostic thresholds.
Pilecka et al. (Wed,) studied this question.
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