Which of the following is the correct classification of forceps delivery based on the station and position of the fetal head at the time of application?

## Classification of Forceps Delivery Forceps deliveries are classified by the **ACOG classification** based on the **station** (position relative to ischial spines) and **scalp visibility** at the time of application: ### Station-Based Classification (ACOG) | Classification | Station | Key Criteria | | --- | --- | --- | | **Outlet forceps** | +2 or below (on perineum) | Scalp **visible at introitus without separating labia**; sagittal suture in AP or oblique diameter (≤45° rotation) | | **Low forceps** | +2 or below (not yet on perineum) | Scalp visible **with** separation of labia; two subdivisions: rotation ≤45° or >45° | | **Mid forceps** | 0 to +2 (engaged, above +2) | Head engaged but above +2 station | | **High forceps** | Above 0 (not engaged) | **Absolutely contraindicated** in modern obstetrics | ### Why Option A is Correct **Option A** accurately defines **outlet forceps**: head at or below +2 station with the scalp visible at the introitus **without separating the labia** — this is the hallmark criterion distinguishing outlet from low forceps. ### Why the Other Options Are Incorrect - **Option B (Mid forceps):** Describes scalp visible with separation of labia at 0 to +2 station — this is the definition of **low forceps**, not mid forceps. Mid forceps applies when the head is engaged but above +2 station. - **Option C (High forceps):** States head at −2 station or above. While high forceps does involve an unengaged head, the defining criterion is that the head is **above 0 station (not engaged)**, not specifically −2. More importantly, high forceps is **absolutely contraindicated** in modern obstetrics — cesarean section is preferred. - **Option D (Low forceps):** States head at +3 station or more in occiput anterior position. A head at +3 or more on the perineum with scalp visible without separating labia would qualify as **outlet forceps**, not low forceps. The mention of "occiput anterior" is irrelevant to the station-based classification. **Key Point:** The critical distinguishing feature between outlet and low forceps is **scalp visibility without vs. with separation of the labia**, not just the station number alone. **High-Yield (ACOG 2000):** Outlet forceps → lowest morbidity; Low forceps (≤45° rotation) → acceptable; Mid forceps → use with caution; High forceps → **contraindicated**. **Clinical Pearl:** Per Williams Obstetrics (25th ed.), if the scalp is visible at the introitus **without** separating the labia, it is outlet forceps. If labia must be separated to see the scalp, it is low forceps — a distinction tested frequently in NEET PG.