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Amniotic fluid index in normal pregnancy: a longitudinal study.

S P Chauhan¹, W E Roberts, J N Martin

¹Department of Obstetrics and Gynecology, Spartanburg Regional Healthcare System, South Carolina, USA.

Journal of the Mississippi State Medical Association

|February 20, 1999

Summary

Amniotic fluid volume, measured by amniotic fluid index, generally remains stable throughout normal pregnancy. However, a significant decrease may occur in pregnancies extending beyond 41 weeks.

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Area of Science:

Obstetrics and Gynecology
Maternal-Fetal Medicine
Fetal Assessment

Background:

Amniotic fluid volume is crucial for normal fetal development.
Understanding changes in amniotic fluid volume throughout pregnancy is essential for monitoring fetal well-being.

Purpose of the Study:

To characterize the longitudinal changes in amniotic fluid volume during normal pregnancy.
To assess the trend of amniotic fluid index (AFI) with advancing gestational age.

Main Methods:

Prospective longitudinal study design.
Serial amniotic fluid index measurements performed by a single sonographer.
Inclusion of patients with uncomplicated pregnancies.

Main Results:

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No significant variation in mean amniotic fluid index was observed between 24 and 40(+6) weeks of gestation (p = 0.381).
In patients delivering at term (42 patients), no significant decrease in AFI was found between the first and last measurement (p = 0.86).
A significant decrease in AFI over time was noted in patients delivering after 41 weeks (14 patients, p = 0.04).

Conclusions:

Amniotic fluid index demonstrates stability throughout the majority of normal pregnancy.
A potential decrease in amniotic fluid volume may be associated with post-term pregnancies (>41 weeks).
Further investigation into AFI changes in prolonged gestations is warranted.