Inpatient Obstetric Nurse (NCC) Practice Exam 2025 - Free NCC Practice Questions and Study Guide

Oligohydramnios, a condition characterized by low amniotic fluid volume, is diagnosed using the amniotic fluid index (AFI), which is a common ultrasound method to assess the amount of amniotic fluid present. A value of less than 5 cm on the AFI indicates significant reduction in fluid levels, consistent with oligohydramnios.

In clinical practice, an AFI less than 5 cm is a key threshold that signals potential risks for both the fetus and the mother. This can include complications such as fetal distress, labor complications, or issues with fetal growth and development. Thus, an AFI of less than 5 cm is considered a clear diagnostic criterion for oligohydramnios, guiding further management and monitoring strategies for the pregnancy.

Other ranges provided in the options—5-9.9 cm indicates a borderline situation that may not necessarily be classified as oligohydramnios but instead as lower normal fluid levels. An AFI between 10-24 cm generally reflects normal amniotic fluid levels, while greater than 25 cm indicates polyhydramnios, which is an excess of amniotic fluid. Hence, a definitive diagnosis of oligohydramnios aligns with the threshold