Question:medium
At which station of the fetal head is outlet forceps applied?
At which station of the fetal head is outlet forceps applied?
Show Hint
Outlet forceps are used only once the head is already on the pelvic floor, visible without parting the labia.
Updated On: Jul 7, 2026
- +2 station
- +3 station
- 'O' station
- After full engagement of head
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Forceps are named low, mid, or outlet based on how far down the fetal head has come when the blades are applied, so the question is really asking us to place outlet forceps on that scale.
Step 2: Key Approach:
Recall the picture of a head about to deliver: it is sitting right on the perineum, the scalp shows at the vaginal opening without the labia being pushed apart, and the head barely needs turning. Match that picture to a station value.
Step 3: Detailed Explanation:
On the classic scale running -3 to +3, with 0 fixed at the ischial spines, the head only reaches the perineum and becomes visible without separating the labia at the deepest point of the scale, station +3. A head at +2 is still slightly higher, one step above the floor of the pelvis, which is the setting for low forceps rather than outlet forceps. A head at station 0 sits at the spines, the setting used for mid forceps. Simply reaching full engagement only confirms the head's widest part passed the brim, and says nothing about how much further down it has traveled since.
Because different textbooks draw the outlet line at slightly different points, this exact question is sometimes accepted with station +2 as well, but the classic teaching definition sits at station +3.
Step 4: Final Answer:
The head has to be at station +3, resting on the pelvic floor, before outlet forceps are applied.
Forceps are named low, mid, or outlet based on how far down the fetal head has come when the blades are applied, so the question is really asking us to place outlet forceps on that scale.
Step 2: Key Approach:
Recall the picture of a head about to deliver: it is sitting right on the perineum, the scalp shows at the vaginal opening without the labia being pushed apart, and the head barely needs turning. Match that picture to a station value.
Step 3: Detailed Explanation:
On the classic scale running -3 to +3, with 0 fixed at the ischial spines, the head only reaches the perineum and becomes visible without separating the labia at the deepest point of the scale, station +3. A head at +2 is still slightly higher, one step above the floor of the pelvis, which is the setting for low forceps rather than outlet forceps. A head at station 0 sits at the spines, the setting used for mid forceps. Simply reaching full engagement only confirms the head's widest part passed the brim, and says nothing about how much further down it has traveled since.
Because different textbooks draw the outlet line at slightly different points, this exact question is sometimes accepted with station +2 as well, but the classic teaching definition sits at station +3.
Step 4: Final Answer:
The head has to be at station +3, resting on the pelvic floor, before outlet forceps are applied.
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