Simone Paganelli1, Emanuele Soncini2, Giuseppina Comitini2, Stefano Palomba2, Giovanni Battista La Sala2,3. 1. Obstetrics and Gynecology Unit, Azienda Ospedaliera Arcispedale Santa Maria Nuova, Viale Risorgimento 80, 42123, Reggio Emilia, Italy. Simone.Paganelli@asmn.re.it. 2. Obstetrics and Gynecology Unit, Azienda Ospedaliera Arcispedale Santa Maria Nuova, Viale Risorgimento 80, 42123, Reggio Emilia, Italy. 3. University of Modena and Reggio Emilia, Via del Pozzo, 71, 41124, Modena, Italy.
Abstract
PURPOSE: The objective of this study is to assess the ultrasound accuracy in fetal weight estimation related to the time distance between the actual weight recorded at delivery and the period of sonography among normal and overweight/obese pregnant women within 3 weeks prior birth at term. METHODS: Four-hundred and ninety patients with healthy pregnancy were studied in a cohort study. The absolute percent error in estimation was achieved by gestation-adjusted projection method from Hadlock model for weight calculation as measure of accuracy. The mean percentage error variation over the weeks was correlated to maternal body mass index (BMI, Kg/m(2)) at ultrasound. The relationship between BMI and ultrasound performance was assessed by linear regression. RESULTS: The overall proportion of supposed sonographic estimated fetal weight at birth within ±10 % of the birth weight significantly declines over the weeks (P = .016). The trend toward a progressive deterioration in ultrasound accuracy is not statistically significant for normal weight women (P = .272) but it is for over-weight/obese (P = .044). On univariate analysis, the absolute percent error and absolute error are positively related to BMI. CONCLUSIONS: Accuracy is related to the week at ultrasound scan with a gradual deterioration over the time and it worsens with increasing distance in days between the date of ultrasounds and delivery. The deterioration is greater for BMI ≥ 25.
PURPOSE: The objective of this study is to assess the ultrasound accuracy in fetal weight estimation related to the time distance between the actual weight recorded at delivery and the period of sonography among normal and overweight/obese pregnant women within 3 weeks prior birth at term. METHODS: Four-hundred and ninety patients with healthy pregnancy were studied in a cohort study. The absolute percent error in estimation was achieved by gestation-adjusted projection method from Hadlock model for weight calculation as measure of accuracy. The mean percentage error variation over the weeks was correlated to maternal body mass index (BMI, Kg/m(2)) at ultrasound. The relationship between BMI and ultrasound performance was assessed by linear regression. RESULTS: The overall proportion of supposed sonographic estimated fetal weight at birth within ±10 % of the birth weight significantly declines over the weeks (P = .016). The trend toward a progressive deterioration in ultrasound accuracy is not statistically significant for normal weight women (P = .272) but it is for over-weight/obese (P = .044). On univariate analysis, the absolute percent error and absolute error are positively related to BMI. CONCLUSIONS: Accuracy is related to the week at ultrasound scan with a gradual deterioration over the time and it worsens with increasing distance in days between the date of ultrasounds and delivery. The deterioration is greater for BMI ≥ 25.
Authors: Chisolum Ogechukwu Okafor; Charles Ikechukwu Okafor; Ikechukwu Innocent Mbachu; Izuchukwu Christian Obionwu; Michael Echeta Aronu Journal: Int J Reprod Med Date: 2019-10-27