Which statement is true based on the material?

• A. Oligohydramnios is amniotic fluid below the normal range.
• B. Oligohydramnios is amniotic fluid above the normal range.
• C. Postterm means gestation less than 37 weeks.
• D. Macrosomia is defined by a birth weight under 2000 g.

Answer: (A)

Oligohydramnios refers to amniotic fluid volume that is too low for the gestational age. In practice, clinicians use measurements like the amniotic fluid index (AFI) or the deepest vertical pocket to define it, with common cutoffs such as an AFI around 5 cm or a deepest pocket around 2 cm indicating reduced fluid. This makes the statement true: amniotic fluid is below the normal range.

Understanding the other terms helps solidify the concept. Oligohydramnios is the opposite of polyhydramnios, which means too much fluid. Postterm means pregnancy beyond 42 weeks, not before 37 weeks. Macrosomia refers to a larger-than-average baby, typically birth weight above 4000 g (often above the 90th percentile), not under 2000 g.