In obstetrics, forceps or vacuum delivery requires the fetal station to be at least at which level?

• A. -2
• B. -1
• C. 0
• D. At least 0

Answer: (A)

Operative vaginal delivery is safe only when the presenting part is sufficiently descended to allow proper placement and controlled traction with instruments. The fetal station is measured from the ischial spines, with negative values indicating the head is above the spines, 0 at the spines, and positive values below.

The minimum level at which forceps or a vacuum can be considered, in this context, is -2. That means the head is two centimeters above the spines, which provides enough access and visibility to apply the instrument and maneuver the head safely. If the head is higher than that (e.g., -3 or more above), there isn’t adequate space for safe instrumentation; if it’s at 0 or lower, it’s more descended and generally more favorable, but -2 is the threshold the question is testing.