Question

At which station of the fetal head is outlet forceps applied?

• A. +2 station
• B. +3 station
• C. 'O' station
• D. After full engagement of head

Hint:

Outlet forceps are used only once the head is already on the pelvic floor, visible without parting the labia.

Answer 1

The Correct Option is B

Step 1: Recall how station is measured.
Station of the fetal head is measured against the level of the ischial spines, marked as station 0. It runs from about -3 at the pelvic inlet through 0 at the spines to +3 when the leading bony point of the skull reaches the pelvic floor and becomes visible at the vulva without separating the labia.

Step 2: Recall the definition of outlet forceps.
Outlet forceps are used only when the scalp is already visible at the introitus without parting the labia, the skull has reached the pelvic floor, and the sagittal suture lies close to the anteroposterior diameter with only a small rotation left to correct. This describes the head at its lowest and final station, station +3 on the classic -3 to +3 scale.

Step 3: Rule out the other options.
Station +2 is one step short of the pelvic floor, so forceps used there are called low forceps, not outlet forceps. Station 0 is the mid pelvis at the level of the ischial spines, used for mid forceps, well above the outlet. Full engagement only means the widest diameter of the head has crossed the pelvic inlet; it does not tell us how far down the head has come afterward, so it cannot by itself define outlet forceps.

Step 4: Note the source ambiguity.
Some course material also marks station +2 as acceptable because a few textbooks describe the outlet definition a little more loosely, so this exact question is sometimes keyed with either +2 or +3. Going by the standard picture, the head already resting on the perineum and visible without separating the labia, station +3 is the safer single answer.

Final Answer:
Outlet forceps are applied when the head has reached station +3, on the pelvic floor.