Alpha-fetoprotein levels in amniotic fluids from spontaneous abortions

Area of Science:

• Prenatal diagnostics
• Biochemistry
• Genetics

Background:

• Alpha-fetoprotein (A.F.P.) is a protein produced by the fetus.
• Elevated A.F.P. levels in amniotic fluid can be associated with fetal abnormalities.
• Intact amniotic sacs in spontaneous abortion provide a unique sample for analysis.

Purpose of the Study:

• To investigate the correlation between A.F.P. levels in intact amniotic fluid and fetal status during spontaneous abortion.
• To determine if A.F.P. levels can predict specific fetal abnormalities, including morphological and cytogenetic ones.

Main Methods:

• Measurement of A.F.P. levels in amniotic fluid from 54 cases of spontaneous abortion with intact amniotic sacs.
• Correlation of A.F.P. levels with fetal morphological examination and cytogenetic analysis.
• Categorization of fetuses based on presence of abnormalities (none, neural tube defects, chromosome anomalies).

Main Results:

• 22 out of 29 fetuses without apparent abnormalities had A.F.P. levels below 50 µg/ml.
• 10 out of 11 fetuses with severe neural tube defects showed elevated A.F.P. levels (50-305 µg/ml).
• Fetuses with 45,X chromosome anomaly (3 out of 4) had significantly raised A.F.P. levels (78-210 µg/ml), while others with different chromosome anomalies and no neural tube defects had levels ≤32 µg/ml.

Conclusions:

• A.F.P. levels in intact amniotic fluid are a potential indicator of fetal abnormalities in spontaneous abortion.
• Elevated A.F.P. levels are strongly associated with neural tube defects and specific chromosomal abnormalities.
• Further research can explore A.F.P. as a non-invasive marker for prenatal screening in specific contexts.