ABSTRACT
To compare correct assessment of gestational age between Transcerebeller diameter versus femur length in third trimester [28-40] using first day of last menstrual period for actual period of gestation. Cross-sectional descriptive study. Department of Obstetrics and Gynecology, Bahawal Victoria Hospital, Bahawalpur from Jun 2012 to Dec 2012. This study was performed on 327 patients in third trimester of pregnancy from 28-40 weeks fulfilling the inclusion criteria. Ultrasound measurements of transcerebellar diameter [TCD] and femur [FL] were made with commercially available real time ultrasound equipment Toshiba Nemio-10 model 2009, Transducer frequency 50/60 Hz. Collected data was analyzed by SPSS version 10. Out of 327 patients, TCD was found to give correct assessment corresponding to the gestational age by LMP in 262 [80.1%] patients, while in 232 [70.9%] patients FL was found to give correct assessment corresponding to the gestational age by LMP. Transcerebellar diameter is more reliable method of gestational age determination in third trimester of pregnancy than femur length. TCD can be used as a tool to assist in the assessment of gestational age in third trimester
ABSTRACT
To determine the frequency of correct assessment by transcerebeller diameter [TCD] versus biparietal diameter [BPD] for gestational age measurement at 36 weeks of pregnancy using first day of last menstrual period [LMP] for actual period of gestation. Quasi experimental. Department of Obstetrics and Gynaecology, Bahawal Victoria Hospital, Bahawalpur from May to November 2010. This study was performed on 228 patients at 36 weeks of pregnancy fulfilling the inclusion criteria. Ultrasound measurements of TCD and BPD was made and compared with LMP. Collected data was analyzed by SPSS version 10. Proportoin of correct diagnosis by each measurement was determined and compared using chi-square test with significance at p < 0.05. Out of 228 patients, TCD was found to give correct assessment in 209 patients [91.7%; p = 0.001] corresponding to the gestational age by LMP i.e 36 weeks. BPD was found to give correct assessment corresponding to the gestational age by LMP in 176 patients [77.2%]. Although both BPD and TCD are accurate biometric parameters at 36 weeks of gestation, transcerebellar diameter is more reliable method of gestational age determination in third trimester of pregnancy than biparietal diameter. TCD can be used as a tool to assist in the assessment of gestational age in third trimester