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Alpha 1-antitrypsin in amniotic fluid

S Guibaud, M Bonnet, J M Thoulon

    Obstetrics and Gynecology
    |January 1, 1975
    PubMed
    Summary
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    Amniotic fluid alpha-1-antitrypsin levels generally decrease with normal pregnancy but rise with Rh-alloimmunization and hydramnios. These levels are unreliable for determining fetal maturity in clinical practice.

    Area of Science:

    • Obstetrics and Gynecology
    • Perinatal Medicine
    • Biochemistry

    Background:

    • Alpha-1-antitrypsin (A1AT) is a key proteinase inhibitor.
    • Amniotic fluid A1AT levels may reflect fetal and maternal well-being during gestation.

    Purpose of the Study:

    • To investigate the trend of amniotic fluid A1AT concentrations throughout pregnancy.
    • To assess the correlation of A1AT levels with gestational age and pregnancy complications.
    • To evaluate the clinical utility of A1AT for determining fetal maturity.

    Main Methods:

    • Radial immunodiffusion technique was used.
    • Amniotic fluid samples (n=317) were collected from 10 to 43 weeks of gestation.
    • Samples were analyzed from normal pregnancies and those with complications like Rh-alloimmunization and hydramnios.

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    Main Results:

    • In normal pregnancies, A1AT values showed a decreasing trend with advancing gestation (e.g., 60.8 mg/100 ml before 30 weeks vs. 17.9 mg/100 ml after 40 weeks).
    • In complicated pregnancies (Rh-alloimmunization, hydramnios), A1AT levels increased with gestational progression.
    • Significant variability in A1AT values was observed across different weeks of gestation.
    • No decrease in A1AT was noted in newborns with hyaline membrane disease.

    Conclusions:

    • Amniotic fluid A1AT levels exhibit distinct patterns in normal versus complicated pregnancies.
    • The wide range of values and observed trends indicate that A1AT is not a reliable marker for fetal maturity assessment.
    • Further research may be needed to clarify the role of A1AT in specific perinatal conditions.