The nurse should use the bell of the stethoscope during auscultation of:

The bell of the stethoscope is used during auscultation to listen for low pitched sounds typical of a heart murmur.

Explanation:
Auscultation is a diagnostic test that listens to sounds from the heart, lungs, bowels, the circulatory system and other parts of the human body.

The stethoscope is an instrument that is designed for auscultation.
The diaphragm of the stethoscope listens for high pitched sounds typical of the bowels, a normal heart, and breathing.
The bell of the stethoscope listens for low pitched sounds typical of a heart murmur.

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