Accuracy of prediction of gestational age by ultrasound measurement of biparietal diameter in Nigerian women

1989 ◽  
Vol 28 (3) ◽  
pp. 217-219 ◽  
Author(s):  
F.E. Okonofua ◽  
F.A. Atoyebi
Keyword(s):  
Gestational Age ◽  
Ultrasound Measurement ◽  
Nigerian Women ◽  
Biparietal Diameter ◽  
Accuracy Of Prediction

scholarly journals Cephalic Index: A Fetal Gestational Age Dependent Biometric Parameter

2011 ◽  
Vol 1 (2) ◽  
pp. 45-48 ◽  
Author(s):  
Emmanuel Stephen Mador ◽  
HY Goncim ◽  
IC Pam ◽  
JT Mutihir ◽  
GI Adoga ◽  
...  
Keyword(s):  
Gestational Age ◽  
Continuous Process ◽  
Postnatal Growth ◽  
Cross Sectional Study ◽  
Cephalic Index ◽  
Cross Sectional ◽  
Nigerian Women ◽  
Abnormal Growth ◽  
Biparietal Diameter ◽  
Biometric Parameter

Objective: There is limited data on fetal cranial dimensions of Nigerian population. This is important because the study of normal and abnormal growth of children has become an increasingly important part of the practice and research in all fields related to child health; more so that prenatal and postnatal growth is one continuous process. Material & Methods: In a cross-sectional study conducted on 13,740 Nigerian fetuses ranging from 12 weeks to 42 weeks at the Centre for Reproductive Health Research Jos; biparietal diameter and occipitofrontal diameter were measured using ultrasound machine in order to calculate fetal cephalic index. The values were statistically analyzed after deriving the relevant indices. Results: The regression equation was calculated between gestational age and cephalic index of fetuses of Nigerian women. This equation y = 1.3x + 59.88; showed a linear relationship which was stronger from 12 to 16 weeks of gestation. Above 16 weeks gestation, the relationship was found to be quite weak. Coefficient of correlation is r2 = 0.9844 (p < 0.0001). Conclusion: The fetal skulls were found to be mesocephalic in the early weeks and brachycephalic at term. Key Words: Cranial dimensions; Cephalic index; Brachycephalic DOI: 10.3126/ajms.v1i2.3145Asian Journal of Medical Sciences 1 (2010) 45-48

Technical report: Prediction of stage of pregnancy in prolific sheep using ultrasound measurement of fetal bones

2002 ◽  
Vol 14 (1) ◽  
pp. 7 ◽  
Author(s):  
Paul L. Greenwood ◽  
Ramona M. Slepetis ◽  
Malcolm J. McPhee ◽  
Alan W. Bell
Keyword(s):  
Absolute Error ◽  
Metacarpal Bone ◽  
Ultrasound Measurement ◽  
Regression Equations ◽  
Predictive Capacity ◽  
Mean Values ◽  
Biparietal Diameter ◽  
Both Bones ◽  
Time Required ◽  
Accuracy Of Prediction

The use of ultrasound to estimate stage of pregnancy was assessed in 32 ewes of a prolific genotype carrying 7 singleton fetuses and 9 twin, 10 triplet and 6 quadruplet litters that were scanned on six occasions from 60 to 120 days of gestation. At least one ultrasound measurement per ewe of fetal metacarpal bone length (MCL), biparietal diameter (BPD), or of both bones was made on over 90% of attempts (n = 152). Measurement of MCL was made on 78% of attempts (n = 371), of BPD on 73% of attempts, and of both bones on 62% of attempts. The equation developed from BPD (mean absolute error (MAE) = 3.2 days) was similar to that developed from measurement of MCL (MAE = 3.3 days) in its capacity to predict stage of pregnancy. Accuracy of prediction was improved using equations that included mean values within litters for BPD (MAE = 2.5 days) and MCL (MAE = 2.6 days). Further improvement in predictive capacity was achieved using multiple regression equations developed from measurement of both bones (individual fetuses: MAE = 2.6 days; equations including mean values within litters: MAE = 2.2 days). The results demonstrate that ultrasound can be used to estimate stage of pregnancy in prolific ewes, and that the use of mean values for bone measurements from different fetuses within litters and/or measurement of bones with different growth allometry can increase the reliability of estimates. The utility of the procedure depends on the number of fetuses measured per ewe, the number of bones measured per fetus and, hence, the time required to measure bones and the degree of accuracy required.

Estimation of gestational age in Merino ewes by ultrasound measurement of fetal head size

1989 ◽  
Vol 40 (6) ◽  
pp. 1293 ◽  
Author(s):  
RW Kelly ◽  
JP Newnham
Keyword(s):  
Gestational Age ◽  
Linear Prediction ◽  
Prediction Equation ◽  
Field Conditions ◽  
Head Length ◽  
Ultrasound Measurement ◽  
Confidence Limits ◽  
Fetal Head ◽  
Biparietal Diameter ◽  
Ultrasound Measurements

Ultrasound measurements of fetal head length (occipito-snout diameter) and width (biparietal diameter) were made at 2-week intervals from about day 45 of pregnancy onwards in 3-6 year old Merino ewes bearing a single fetus, and at 1 week intervals from about day 36 to 86 of pregnancy in 4-5 year old Merino ewes bearing twin fetuses. The single-bearing ewes maintained liveweight (47 kg) during the study. The twin-bearing ewes (47 kg on day 30) were fed either to maintain weight or at 0.3 of this rate until about day 96 of pregnancy. A sample of ewes from both studies were slaughtered on days 92-94 of pregnancy, and comparable measurements taken. There were no significant effects of sex of the fetus, or undernutrition of the twin-bearing ewes on the head dimensions, except for effects (P<0.05) of feeding treatment on head length of the twins at about day 51, day 86 and day 92. The magnitude of these differences was small ( < 2 mm), equivalent to about 2 days' growth. Fetal head measurements were similar for single and twin fetuses up to about 80 days gestation. It was concluded that the most accurate prediction of gestational age was provided by head length of the fetus, with 95% confidence limits ranging from �2 days at about day 40 of pregnancy to �4 days at day 80 of pregnancy. A single linear prediction equation would be the most appropriate to use under field conditions. Verification of these relationships is recommended to check for differences that may exist between equipment, operators and breeds of sheep.

scholarly journals Can a Difference in Gestational Age According to Biparietal Diameter and Abdominal Circumference Predict Intrapartum Placental Abruption?

2021 ◽  
Vol 10 (11) ◽  
pp. 2413
Author(s):  
Jee-Youn Hong ◽  
Jin-Ha Kim ◽  
Seo-yeon Kim ◽  
Ji-Hee Sung ◽  
Suk-Joo Choi ◽  
...  
Keyword(s):  
Gestational Age ◽  
Odds Ratio ◽  
Retrospective Cohort ◽  
Maternal Age ◽  
Placental Abruption ◽  
Independent Predictor ◽  
Abdominal Circumference ◽  
Biparietal Diameter ◽  
Study Population ◽  
Independent Risk Factors

This study aimed to investigate whether a difference in gestational age according to biparietal diameter (BPD) and abdominal circumference (AC) could be a clinically useful predictor of placental abruption during the intrapartum period. This retrospective cohort study was based on singletons who were delivered after 32 + 0 weeks between July 2015 and July 2020. We only included cases with at least two antepartum sonographies available within 4 weeks of delivery (n = 2790). We divided the study population into two groups according to the presence or absence of placental abruption and compared the clinical variables. The incidence of placental abruption was 2.0% (56/2790) and was associated with an older maternal age, a higher rate of preeclampsia, and being small for the gestational age. A difference of >2 weeks in gestational age according to BPD and AC occurred at a higher rate in the placental abruption group compared to the no abruption group (>2 weeks, 21.4% (12/56) vs. 7.5% (205/2734), p < 0.001; >3 weeks, 12.5% (7/56) vs. 2.0% (56/2734), p < 0.001). Logistic regression analysis revealed that the differences of >2 weeks and >3 weeks were both independent risk factors for placental abruption (odds ratio (OR) (95% confidence interval), 2.289 (1.140–4.600) and 3.918 (1.517–9.771), respectively) after adjusting for maternal age, preeclampsia, and small for gestational age births. We identified that a difference in gestational age of >2 weeks between BPD and AC could be an independent predictor of placental abruption.

Estimation of gestational age by ultrasound measurement of fetal transcerebellar diameter

2021 ◽  
Vol 70 (1) ◽  
pp. 19
Author(s):  
Maheswari Cinnusamy ◽  
Deepti Shastri ◽  
JosephineArokia Martina
Keyword(s):  
Gestational Age ◽  
Ultrasound Measurement

scholarly journals Placental thickness: an important parameter in determining gestational age and fetal growth during ANC scan

2018 ◽  
Vol 7 (11) ◽  
pp. 4619
Author(s):  
Dipali Kadam ◽  
Saurabh Patil ◽  
Meenal Jain
Keyword(s):  
Gestational Age ◽  
Abdominal Circumference ◽  
P Value ◽  
Third Trimester ◽  
Cross Sectional ◽  
Femur Length ◽  
Biparietal Diameter ◽  
Antenatal Sonography ◽  
Umbilical Cord Insertion ◽  
Placental Thickness

Background: Gestational Age (GA) is one of the most imperative parameters required for proper management in pregnancy. Routinely GA is estimated by sonography utilising Biparietal Diameter (BPD), Femur Length (FL), Abdominal Circumference (AC) and Head Circumference (HC). In any case, these parameters have some limitations. Hence, there is need to find other parameters that may complement the established fetal biometric parameters in predicting GA. The objective of the present study was to assess placental thickness in second and third trimester pregnancies and its relationship with fetal gestational age and its role in detecting LBW and IUGRMethods: A cross sectional prospective study was carried out in three hundred pregnant women between 13 to 40 weeks of gestation, who came for routine antenatal sonography. Placental thickness was measured along with routine parameters. Placental thickness was measured at the level of umbilical cord insertion by two-dimensional ultrasonography.Results: Correlation between the GA by LMP and Placental thickness by ultrasound was done by using Karl Pearson's Correlation(r). The values were expressed as mean + standard deviation. Correlation between placental thickness and gestational age was statistically significant as p value is <0.01. Placental thickness measured in millimetres increases with gestational age in second and third trimester.Conclusions: The correlation between the placental thickness and gestational age was linear and direct. Therefore, Placental thickness is used as a predictor for estimation of gestational age of the fetus in cases where LMP is not known and in detecting developing IUGR and low birth weight.

Sonographic Correlation Between Distal Femoral Epiphysis Ossification Centre And Gestational Age From 28 Weeks To 40 Weeks In Population Of Faisalabad City

2020 ◽  
pp. 12-19
Author(s):  
OJS Admin
Keyword(s):  
Gestational Age ◽  
Age Estimation ◽  
Abdominal Circumference ◽  
Perinatal Morbidity ◽  
Ossification Centre ◽  
Age Assessment ◽  
Crown Rump Length ◽  
Biparietal Diameter ◽  
Distal Femoral Epiphysis ◽  
Ossification Centers

Gestational age assessment is one of the most important tool used for estimation of perinatal morbidity and mortality. Age estimation of fetus can be recorded with the help of various parameters such as biparietal diameter, abdominal circumference, head circumference, length of the kidneys, crown rump length, length of the long bones and ossification centers.

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