Inpatient Obstetric Nurse (NCC) Practice Exam

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What volume of fluid corresponds to an AFI of 25 cm?

1000 ml
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2000 ml
2500 ml

The correct answer is: 2000 ml

An Amniotic Fluid Index (AFI) of 25 cm indicates a significant volume of amniotic fluid present in the amniotic sac. The AFI is a quantitative assessment used in obstetrics to estimate the amount of amniotic fluid surrounding the fetus, and it is calculated by measuring the maximum vertical pockets of fluid in four quadrants of the uterus. An AFI of 25 cm generally suggests a condition of polyhydramnios, which is characterized by an excess of amniotic fluid. Normal AFI values range from 8 to 18 cm, while values above 24 cm are typically classified as polyhydramnios. The fluid volume correlating with an AFI of 25 cm is generally recognized to be around 2000 ml (or 2 liters), as the volume represented by the AFI roughly correlates with the measured fluid volume in the amniotic sac. Thus, the correct answer reflects this understanding of the relationship between AFI measurements and actual fluid volumes. It highlights the significance of monitoring amniotic fluid levels during pregnancy as part of fetal well-being assessments.