By Greg Friese
Photos by Greg Friese
Carefully follow this sequence of calibration steps:
- 1) Place ear pieces in your ear canals.
- 2) Place bell of stethoscope on your left superior chest at the mid-clavicular line, at about the third intercostal space.
- 3) Listen carefully for a rhythmic thub-dub.
- 4) Count thub-dubs for 30 seconds.
- 5) Place bell of stethoscope on your left mid-axillary line at about the fourth intercostal space.
- 6) Listen carefully for a rhythmic thub-dub.
- 7) Count thub-dubs for 30 seconds.
- 8) Multiply both count tallies by two. Add the two counts together. Then divide by two.
This number is your stethoscope calibration benchmark. Write it down and store it in a safe place. Each month, repeat and document the calibration test. If there is a variation more or less than 15 percent, seek out assistance from your training officer, service director or medical director. If your benchmark calculation result is less than or equal to zero, request immediate medical assistance.
Please post your calibration benchmark in the comments area, which will be used for an important EMS1.com research project.