Fetal heart rate can be auscultated with a fetoscope at:

Appeared in: BHU NO-2019

Explanation

A fetoscope is a non-electronic, horn-shaped or stethoscope-like device used for auscultating fetal heart sounds.
The fetal heart is typically strong enough to be heard with a fetoscope between 18 and 20 weeks of gestation.
This method relies on direct sound transmission through the mother's abdomen without any electronic amplification.
Among the given options, 20 weeks is the standard and earliest milestone for successful auscultation using a fetoscope.

Option A: At 5 weeks, the embryo is too small, and the heart is not developed enough for its sounds to be detected by any method, let alone a fetoscope. Cardiac activity only becomes visible on transvaginal ultrasound around 6 weeks.
Option C: At 10 weeks, the fetal heart sounds are audible but only with the use of an electronic Doppler device, which amplifies the sound waves. A non-amplified fetoscope cannot detect the heartbeat this early.
Option D: While the fetal heart rate is clearly audible with a fetoscope at 25 weeks, the question asks for the gestational age at which it can first be auscultated. The milestone for initial detection with a fetoscope is around 20 weeks.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Timeline for fetal heart rate detection methods as background academic context rather than a clinical decision trigger.
Knowing the correct assessment tool for each gestational age is crucial for providing accurate information to expectant mothers and avoiding false assurances or unnecessary anxiety.
A key nursing skill during auscultation is to simultaneously palpate the mother's radial pulse to differentiate it from the fetal heart rate, ensuring an accurate count.
Using Leopold's maneuvers before auscultation helps the nurse locate the fetal back, which is usually the best position to hear the heartbeat clearly.

How to Approach the Question

First, identify the key terms in the question: 'Fetal heart rate,' 'auscultated,' and 'fetoscope.'
Recognize that 'fetoscope' refers to a specific, non-electronic instrument, distinct from an electronic Doppler or an ultrasound machine.
Recall the established timelines for detecting fetal heart rate with different instruments.
Remember that a transvaginal ultrasound can visualize cardiac activity first (around 6 weeks), followed by a Doppler device (around 10-12 weeks), and finally a fetoscope (around 18-20 weeks).
Compare the given options to the known timeline for a fetoscope.
Select the option that correctly aligns with the 18-20 week milestone for initial fetoscope auscultation.

Concept Tested & Keywords

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E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 50-60

E6 Obstetrics Williams p. 20-36

Practise the full BHU NO-2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.