ACOG ePoster Library

Abstract
Discussion Forum (0)
Introduction: Obesity is a known risk factor for fetal macrosomia (birth weight [BW] greater than or equal to 4,500g), but prior studies examining its effect on sonographic estimated fetal weight (SEFW) have been equivocal. Our objective was to determine the impact of obesity on sonographic detection of macrosomia.

Methods: We performed a multicenter retrospective cohort study of all non-anomalous singletons with SEFW greater than or equal to 4,000g. All SEFWs were performed by Registered Diagnostic Medical Sonographers within 14 days of delivery and were calculated using a Hadlock equation. Patients were grouped according to body mass index (kg/m2) at delivery ( < 30.0 [non-obese], 30.0-39.9 [obese], and ≥ 40.0 [morbidly obese]). The primary outcome was the detection rate (DR) of macrosomic newborns. Secondary outcomes were false positive rate (FPR) and area under the receiver operator curve (AUC).

Results: Of the 330 women included, 83 (25.2%) were non-obese, 145 (43.9%) were obese, and 102 (30.9%) were morbidly obese. Overall there were 51 (15.5%) macrosomic newborns and its prevalence varied: 8.4% among non-obese, 14.5% among obese, and 22.5% among morbidly obese women. There were no significant differences in DR (42.9%, 52.4%, 60.9%; P = .67), FPR (7.9%, 9.7%, 10.1%; P = .87), or AUC (0.79, 0.77, 0.86; P= .51) for BW greater than or equal to 4,500g between non-obese, obese, and morbidly obese women, respectively.

Conclusion/Implications: Maternal obesity does not influence sonographic detection of newborns with BW of at least 4,500g. Clinicians should not consider maternal obesity to be a limitation for identification of macrosomic newborns.

Introduction: Obesity is a known risk factor for fetal macrosomia (birth weight [BW] greater than or equal to 4,500g), but prior studies examining its effect on sonographic estimated fetal weight (SEFW) have been equivocal. Our objective was to determine the impact of obesity on sonographic detection of macrosomia.

Methods: We performed a multicenter retrospective cohort study of all non-anomalous singletons with SEFW greater than or equal to 4,000g. All SEFWs were performed by Registered Diagnostic Medical Sonographers within 14 days of delivery and were calculated using a Hadlock equation. Patients were grouped according to body mass index (kg/m2) at delivery ( < 30.0 [non-obese], 30.0-39.9 [obese], and ≥ 40.0 [morbidly obese]). The primary outcome was the detection rate (DR) of macrosomic newborns. Secondary outcomes were false positive rate (FPR) and area under the receiver operator curve (AUC).

Results: Of the 330 women included, 83 (25.2%) were non-obese, 145 (43.9%) were obese, and 102 (30.9%) were morbidly obese. Overall there were 51 (15.5%) macrosomic newborns and its prevalence varied: 8.4% among non-obese, 14.5% among obese, and 22.5% among morbidly obese women. There were no significant differences in DR (42.9%, 52.4%, 60.9%; P = .67), FPR (7.9%, 9.7%, 10.1%; P = .87), or AUC (0.79, 0.77, 0.86; P= .51) for BW greater than or equal to 4,500g between non-obese, obese, and morbidly obese women, respectively.

Conclusion/Implications: Maternal obesity does not influence sonographic detection of newborns with BW of at least 4,500g. Clinicians should not consider maternal obesity to be a limitation for identification of macrosomic newborns.

Identification of Newborns with Birth Weight of 4,500 Grams or More: The Impact of Obesity
Bonnie Blackburn
Bonnie Blackburn
ACOG ePoster. Blackburn B. 10/30/2020; 289071; 16O
user
Bonnie Blackburn
Abstract
Discussion Forum (0)
Introduction: Obesity is a known risk factor for fetal macrosomia (birth weight [BW] greater than or equal to 4,500g), but prior studies examining its effect on sonographic estimated fetal weight (SEFW) have been equivocal. Our objective was to determine the impact of obesity on sonographic detection of macrosomia.

Methods: We performed a multicenter retrospective cohort study of all non-anomalous singletons with SEFW greater than or equal to 4,000g. All SEFWs were performed by Registered Diagnostic Medical Sonographers within 14 days of delivery and were calculated using a Hadlock equation. Patients were grouped according to body mass index (kg/m2) at delivery ( < 30.0 [non-obese], 30.0-39.9 [obese], and ≥ 40.0 [morbidly obese]). The primary outcome was the detection rate (DR) of macrosomic newborns. Secondary outcomes were false positive rate (FPR) and area under the receiver operator curve (AUC).

Results: Of the 330 women included, 83 (25.2%) were non-obese, 145 (43.9%) were obese, and 102 (30.9%) were morbidly obese. Overall there were 51 (15.5%) macrosomic newborns and its prevalence varied: 8.4% among non-obese, 14.5% among obese, and 22.5% among morbidly obese women. There were no significant differences in DR (42.9%, 52.4%, 60.9%; P = .67), FPR (7.9%, 9.7%, 10.1%; P = .87), or AUC (0.79, 0.77, 0.86; P= .51) for BW greater than or equal to 4,500g between non-obese, obese, and morbidly obese women, respectively.

Conclusion/Implications: Maternal obesity does not influence sonographic detection of newborns with BW of at least 4,500g. Clinicians should not consider maternal obesity to be a limitation for identification of macrosomic newborns.

Introduction: Obesity is a known risk factor for fetal macrosomia (birth weight [BW] greater than or equal to 4,500g), but prior studies examining its effect on sonographic estimated fetal weight (SEFW) have been equivocal. Our objective was to determine the impact of obesity on sonographic detection of macrosomia.

Methods: We performed a multicenter retrospective cohort study of all non-anomalous singletons with SEFW greater than or equal to 4,000g. All SEFWs were performed by Registered Diagnostic Medical Sonographers within 14 days of delivery and were calculated using a Hadlock equation. Patients were grouped according to body mass index (kg/m2) at delivery ( < 30.0 [non-obese], 30.0-39.9 [obese], and ≥ 40.0 [morbidly obese]). The primary outcome was the detection rate (DR) of macrosomic newborns. Secondary outcomes were false positive rate (FPR) and area under the receiver operator curve (AUC).

Results: Of the 330 women included, 83 (25.2%) were non-obese, 145 (43.9%) were obese, and 102 (30.9%) were morbidly obese. Overall there were 51 (15.5%) macrosomic newborns and its prevalence varied: 8.4% among non-obese, 14.5% among obese, and 22.5% among morbidly obese women. There were no significant differences in DR (42.9%, 52.4%, 60.9%; P = .67), FPR (7.9%, 9.7%, 10.1%; P = .87), or AUC (0.79, 0.77, 0.86; P= .51) for BW greater than or equal to 4,500g between non-obese, obese, and morbidly obese women, respectively.

Conclusion/Implications: Maternal obesity does not influence sonographic detection of newborns with BW of at least 4,500g. Clinicians should not consider maternal obesity to be a limitation for identification of macrosomic newborns.

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