Distribution of Placental Grading by Gestational Age |
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| Institution: | 1. Department of Obstetrics and Gynecology, the Fifth Affiliated Hospital, Jinan University School of Medicine, Qingyuan, People’s Republic of China;2. Bureau of Reproductive and Child Health, Laboratory Centre for Disease Control, Health Canada, Ottawa, Canada;3. Participating Centres in the Central-South China Fetal Growth Study: Department of Obstetrics and Gynecology, the First Affiliated Hospital, Hunan Medical University, Changsha, Hunan, P. R. of China (Co-ordinating centre); Perinatal Care Unit, Provincial People’s Hospital, Zhengzhong, Henan, P. R. of China; Perinatal Care Unit, Provincial Maternal and Infant Hospital, Nanning, Guangxi, P. R. of China; Department of Obstetrics and Gynecology, the First Affiliated Hospital, Guanzhong Medical College, Guangzhong, Guangdong, P. R. of China.;1. Department of Biological Sciences, Simon Fraser University, Burnaby, Canada;2. Department of Pathology and Laboratory Medicine, University of Ottawa, Ottawa, Canada;1. Department of Pharmacy, The Islamia University of Bahawalpur, 63100 Bahawalpur, Pakistan;2. Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland;3. Helsinki Institute of Life Science (HiLIFE), University of Helsinki, FI-00014 Helsinki, Finland |
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| Abstract: | Objective: to describe the ultrasonography-based gestation-specific placental grading distribution in a Chinese population.Methods: ultrasonographic examination of placentae was performed in 5,476 normal pregnancies (more than 95% first births) in five obstetric ultrasound laboratories in Central-South China between January 1, 1992 and December 31, 1993. A gestation-specific placental grading distribution was presented and compared with previous studies.Results: the gestational ages of the patients included in this study ranged from 16 to 40 weeks. The gestation-specific distribution of placental grading showed patterns similar to those observed previously, with grade III placentae starting to occur at 32 weeks and increasing to 32.3 percent at 40 weeks of gestation.Conclusions: the occurrence of grade III placentae is too high in preterm and too low in term pregnancies. Ultrasonographic placental grading alone is not a reliable measure of fetal pulmonary maturity. |
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| Keywords: | Ultrasonography obstetrics placentae placental grading fetal growth fetal pulmonary maturity |
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