Biological Verification

In addition to formal annual calibration, self-directed biological verification of your SHOEBOX system can be helpful in ensuring all of your components are performing properly.

A biological verification can be executed at any time, but is especially important when:

  • You’re traveling with your system
  • The system components haven’t been used for an extended period of time

Depending on the regulations you adhere to, biological verification can be used in place of (or in addition to) a biological check. If you’re required to maintain a verification log, you may be required to log either, or both, of these checks. 

Biological verification can be done by testing an individual with known and stable hearing levels.

To perform a biological verification:

  1. Create a control patient. We recommend naming it “Biological Verification” so it’s easy to find and won’t be confused with a real patient. This patient will be selected whenever you’d like to perform a check. This format makes it easy to:
    1. Compare subsequent tests with the baseline audiogram already saved under the control patient
    2. Find a tally of all the results from biological verification activities, which is useful for auditing and/or troubleshooting purposes
  2. It’s recommended to test a minimum of two frequencies per ear (e.g. 1000 and 4000 Hz), but any number of frequencies can be selected. Note that OSHA (Occupational Safety and Health Administration) requires that all test frequencies be tested (500, 1000, 2000, 3000, 4000, 6000 Hz - 8000 Hz optionally)
  3. If any of the threshold(s) are more than 10dB different from those on the baseline test, a recalibration or change of transducer could be required

We also recommend ensuring all connections between equipment components are free from static, crackling, and/or intermittencies. To do this:

  1. Play a tone
  2. While playing the tone, apply tactile pressure on the jack to the iPad and vary the pressure. Wiggling is also encouraged
    Note: this also applies to any connector cables, Switchboxes, and wires to the headphones
  3. If static, crackling, or intermittencies are detected, the transducer, or associated component, should be replaced

Last Updated: 2019-12-06

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