Sánchez-Fernández, MariolaCorral, Maria E.Aceituno, LonginosMazheika, MarinaMendoza, NicolásMozas-Moreno, Juan2022-07-082022-07-082021-02-27Sánchez-Fernández M, Corral ME, Aceituno L, Mazheika M, Mendoza N, Mozas-Moreno J. Observer Influence with Other Variables on the Accuracy of Ultrasound Estimation of Fetal Weight at Term. Medicina (Kaunas). 2021 Feb 27;57(3):216http://hdl.handle.net/10668/3760Background and Objectives: The accuracy with which the estimation of fetal weight (EFW) at term is determined is useful in order to address obstetric complications, since it is a parameter that represents an important prognostic factor for perinatal and maternal morbidity and mortality. The aim of this study was to determine the role of the experienced observers with other variables that could influence the accuracy of the ultrasound used to calculate EFW at term, carried out within a period of seven days prior to delivery, in order to assess interobserver variability. Materials and Methods: A cross-sectional study was performed including 1144 pregnancies at term. The validity of the ultrasound used to calculate EFW at term was analyzed using simple error, absolute error, percentage error and absolute percentage error, as well as the percentage of predictions with an error less than 10 and 15% in relation to maternal, obstetric and ultrasound variables. Results: Valid predictions with an error less than 10 and 15% were 74.7 and 89.7% respectively, with such precision decreasing according to the observer as well as in extreme fetal weights. The remaining variables were not significant in ultrasound EFW at term. The simple error, absolute error, percentage error and absolute percentage error were greater in cases of extreme fetal weights, with a tendency to overestimate the low weights and underestimate the high weights. Conclusions: The accuracy of EFW with ultrasound carried out within seven days prior to birth is not affected by maternal or obstetric variables, or by the time interval between the ultrasound and delivery. However, accuracy was reduced by the observers and in extreme fetal weights.enAtribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/Birth weightFetal weightUltrasound fetal biometryEstimated fetal weightFetal macrosomiaFetal microsomiaFetal growth restrictionPeso al nacerPeso fetalMacrosomía fetalRetardo del crecimiento fetalMedical Subject Headings::Phenomena and Processes::Physiological Phenomena::Physiological Processes::Growth and Development::Growth::Body Size::Body Weight::Birth WeightMedical Subject Headings::Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Epidemiologic Study Characteristics as Topic::Epidemiologic Studies::Cross-Sectional StudiesMedical Subject Headings::Phenomena and Processes::Reproductive and Urinary Physiological Phenomena::Reproductive Physiological Phenomena::Sexuality::Homosexuality::Homosexuality, FemaleMedical Subject Headings::Phenomena and Processes::Physiological Phenomena::Physiological Processes::Growth and Development::Morphogenesis::Embryonic and Fetal Development::Fetal Development::Gestational AgeMedical Subject Headings::Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::HumansMedical Subject Headings::Phenomena and Processes::Reproductive and Urinary Physiological Phenomena::Reproductive Physiological Phenomena::Reproductive Physiological Processes::Reproduction::PregnancyMedical Subject Headings::Diseases::Pathological Conditions, Signs and Symptoms::Signs and Symptoms::Body Weight::Fetal WeightMedical Subject Headings::Analytical, Diagnostic and Therapeutic Techniques and Equipment::Diagnosis::Diagnostic Techniques and Procedures::Diagnostic Techniques, Obstetrical and Gynecological::Prenatal Diagnosis::Ultrasonography, PrenatalMedical Subject Headings::Analytical, Diagnostic and Therapeutic Techniques and Equipment::Diagnosis::Prognosisresearch article33673504open access10.3390/medicina570302161648-9144PMC7997135