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First-trimester free beta (hCG) screening for Down syndrome
Prenatal Diagnosis
|July 1, 1993
Summary
Elevated maternal serum free beta human chorionic gonadotropin (hCG) levels in the first trimester may indicate Down syndrome. Further research is needed as altered levels also occur in other pregnancy complications.
Area of Science:
- Biochemistry
- Genetics
- Maternal-Fetal Medicine
Background:
- Down syndrome is a genetic condition.
- First-trimester screening for Down syndrome is crucial for early intervention.
- Biochemical markers in maternal serum are used for prenatal screening.
Purpose of the Study:
- To investigate the potential of maternal serum free beta (hCG) as a first-trimester screening marker for Down syndrome.
- To compare free beta (hCG) levels in pregnancies with Down syndrome to those in unaffected pregnancies.
Main Methods:
- Maternal serum samples were collected in the first trimester.
- Concentrations of free beta (hCG) were measured.
- Levels were expressed as multiples of the median (MOM) and compared between cases and controls.
Main Results:
- Maternal serum free beta (hCG) levels were significantly elevated (median 2.20 MOM) in the 38 Down syndrome cases compared to controls.
- Altered free beta (hCG) levels were also noted in other pregnancy conditions.
Conclusions:
- Elevated first-trimester maternal serum free beta (hCG) shows potential as a screening marker for Down syndrome.
- The specificity of this marker needs further evaluation due to its alteration in other pregnancy complications.