On vaginal examination, which level +1 station of the fetal head determines the fetal presentng part?

Correct option is B

Ans. (b) Sol. The +1 station of the fetal head is 1 cm below the ischial spines. This is the level at which the presenting part of the fetus is located during labor and is used to assess fetal descent through the birth canal.
Explanation of each option:
· (a) 1 cm above the iliac crest – Incorrect. This is not the station for determining fetal descent.
· (b) 1 cm below the ischial spines – Correct. The +1 station corresponds to this level, marking the start of the descent of the fetal head in labor.
· (c) 1 inch above the symphysis pubis – Incorrect. This is not typically used to determine the presenting part.
· (d) 1 inch below the coccyx – Incorrect. This is too far posterior and does not correspond to the +1 station for fetal descent.