Fetal scalp blood pH of less than ……………………. is abnormal :
**Core Concept**
The question tests the understanding of fetal monitoring and the normal range of fetal scalp blood pH. Fetal scalp blood pH is an indicator of fetal well-being, particularly in the context of labor.
**Why the Correct Answer is Right**
A fetal scalp blood pH of less than 7.20 is generally considered abnormal, indicating potential fetal distress. This is because a pH below 7.20 may suggest that the fetus is experiencing acidosis, which can be a sign of compromise.
**Why Each Wrong Option is Incorrect**
**Option A:** A pH of less than 7.25 may still be within a borderline range but is not the threshold for abnormality.
**Option B:** A pH of less than 7.30 is within the normal range for fetal scalp blood pH.
**Option D:** A pH of less than 7.15, while abnormal, does not represent the threshold value.
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that fetal scalp blood sampling is used to assess fetal well-being during labor, especially when there are concerns about fetal distress.
**Correct Answer:** C. 7.20