Okay, let's tackle this question about fetal heart rate (FHR) monitoring during the first stage of labor in low-risk pregnancies. The question is asking how often FHR should be auscultated. First, I need to recall the guidelines for FHR monitoring.

The core concept here is about the standard of care for FHR monitoring. In low-risk pregnancies, intermittent auscultation is typically used instead of continuous electronic monitoring. The key is knowing the recommended frequency during different stages of labor.

The first stage of labor has two phases: latent and active. Guidelines, like those from ACOG or WHO, usually recommend auscultation every 30 minutes during the latent phase and every 15 minutes in the active phase. But wait, sometimes the answer might be every 5 minutes if it's during the pushing phase, but that's the second stage. So the first stage's active phase is every 15 minutes. However, some sources might say every 15 minutes throughout the first stage. I need to confirm.

Now, looking at the options. Let's assume the options are A. 5 minutes, B. 10 minutes, C. 15 minutes, D. 30 minutes. The correct answer would be C. 15 minutes. But I need to check if the first stage's active phase is 15 minutes and latent phase 30. The question says "first stage of labor," so maybe the answer is every 15 minutes during active labor. Wait, but some guidelines might combine latent and active. Let me think again.

The WHO recommends in low-risk pregnancies, during the first stage, auscultate every 15 minutes. So if the options include 15 minutes, that's correct. The incorrect options would be 5, 10, or 30. For example, 5 minutes is too frequent and more for the second stage when pushing. 10 minutes is not a standard. 30 minutes is for the latent phase, but if the question is about the first stage as a whole, maybe 15 minutes is the answer. The correct answer is likely every 15 minutes.

So the core concept is intermittent auscultation in low-risk patients during the first stage. The correct answer is 15 minutes. The other options are either too frequent (5, 10) or for different stages (30 minutes for latent). The clinical pearl is to remember the 15-minute interval for active first stage labor in low-risk cases.

**Core Concept**
Intermittent auscultation of fetal heart rate (FHR) is standard in low-risk pregnancies during labor. Guidelines recommend specific intervals for monitoring to balance maternal comfort and fetal safety.

**Why the Correct Answer is Right**
In low-risk pregnancies, FHR should be auscultated **every 15 minutes** during the **active phase** of the first stage of labor. This interval aligns with WHO and ACOG recommendations to detect fetal distress while minimizing unnecessary interventions. The active phase is defined by cervical dilation ≥4 cm and regular contractions, requiring more frequent monitoring than the latent phase.

**Why Each Wrong Option is Incorrect**
**Option A: 5 minutes** – This frequency is reserved for the **second stage** of labor (after full cervical dilation) or high-risk pregnancies, not

✓ Correct Answer: C. 30 mins