A study to evaluate a correlation between various Gray Scale parameters and period of gestation

Nancy Chakarvarty; Kumkum Srivastav; Sachin Khanduri

doi:10.18203/2320-1770.ijrcog20182364

Authors

Nancy Chakarvarty Department of Obstetrics and Gynecology, Maharaja Agrasen Medical College, Agroha, Hisar, Haryana, India
Kumkum Srivastav Department of Obstetrics and Gynecology, Eras Lucknow Medical College, Lucknow, Uttar Pradesh, India
Sachin Khanduri Department of Radiodiagnosis, Eras Lucknow Medical College, Lucknow, Uttar Pradesh, India

DOI:

https://doi.org/10.18203/2320-1770.ijrcog20182364

Keywords:

FL/AC ratio, Gray scale USG, HC/AC ratio, TCD/AC ratio

Abstract

Background: Accurate prediction of the gestational age (GA) is very important in the management of obstetric patients for planning a timely and uneventful outcome. Fetuses with intrauterine growth restriction (IUGR) are at high risk for poor short- and long-term outcome. The present study was conducted with the aim to evaluate a correlation between various Gray Scale parameters and period of gestation.

Methods: A total of 100 clinically suspected FGR subjects were enrolled for the present study. Women with singleton pregnancies with fundal height being less than the period of gestation by 4 weeks or more and certainty of last menstrual period with previous 3 menstrual cycles were included in the present study. Ultrasound examination both by Gray Scale USG carried out serially every three weeks starting from 30 weeks till delivery. Chi-square test was used to compare the proportions while Independent Samples "t"-test was used to compare the parametric variables in two groups. Receiver-Operator curve analysis was performed to find out appropriate cut-off points for prediction of FGR.

Results: Diagnostic accuracy of TCD/AC ratio as a marker of FGR was found to be 77%, of HC/AC ratio was found to be 93% and FL/AC ratio was 59%.

Conclusions: Among three gray scale parameters being assessed, HC/AC ratio at 36 weeks was observed to be having 98.5% sensitivity and 82.9% specificity, thus showing the highest diagnostic accuracy (93%). However, from the point of view of early detection, TCD/AC ratio was found to be most efficient with 81.5% sensitivity and 68.6% specificity and overall diagnostic accuracy of 77%. Precision of Grayscale findings at later stage (36 weeks) are higher.

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