Related Experiment Video
Updated: Aug 10, 2026

Semiconductor Sequencing for Preimplantation Genetic Testing for Aneuploidy
Published on: August 25, 2019
Very low maternal serum chorionic gonadotropin levels in association with fetal triploidy
D Schmidt1, L G Shaffer, C McCaskill
1Institute for Molecular Genetics, Baylor College of Medicine, Houston, TX 77030.
Objective:
The objective of this study was to identify the parental origin of the extra haploid set of chromosomes in triploid pregnancies and to correlate the parental origin to very low levels of human chorionic gonadotropin and unconjugated estriol levels (multiple of the median < or = 0.20) and normal alpha-fetoprotein levels.
Study Design:
Three triploid pregnancies were ascertained retrospectively, and three pregnancies were identified prospectively. Maternal sera samples were analyzed for levels of alpha-fetoprotein, human chorionic gonadotropin, and unconjugated estriol. Deoxyribonucleic acid analysis was performed on parental bloods and fetal fibroblasts in two prospectively identified pregnancies to establish the parental origin of the extra set of chromosomes.
Results:
Levels of alpha-fetoprotein were normal in all pregnancies. Levels of human chorionic gonadotropin were very low in five of six of pregnancies, and unconjugated estriol levels were low in three of six pregnancies. Deoxyribonucleic acid analysis indicated maternal origin of the extra haploid set of chromosomes in two triploids.
Conclusion:
When the extra haploid set of chromosomes are maternally derived, some triploid pregnancies exhibit very low levels of maternal serum human chorionic gonadotropin and unconjugated estriol with normal levels of alpha-fetoprotein.
More Related Videos
11:54Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues
Published on: October 20, 2019
03:19Modifying Levels of Maternal Dietary Folic Acid or Choline to Study the Impact of Deficiencies on Offspring Health Outcomes
Published on: June 28, 2024
Related Concept Videos
Meiosis I
Nondisjunction
Meiosis vs. Mitosis
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Nondisjunction
Teratogenicity
Ovarian Cycle