Tympanometry

• Alternative Names

  Tympanogram

• How the test is performed

  Before the test, your health care provider will look inside your ear canal to make sure there is a clear path to your eardrum.

  Next, a device is placed into your ear. This device changes the air pressure in your ear and makes the eardrum move back and forth. A machine records the results on graphs called tympanograms.

• How to prepare for the test

  You should not move, speak, or swallow during the test. Such movements can change the pressure in the middle ear and give incorrect test results.

  The sounds heard during the test may be loud and potentially startling. You will need to try very hard to avoid being anxious and becoming startled during the test.

  If your child is to have this test done it may be helpful to show how the test is done using a doll. The more familiar your child is with what will happen and why, the less anxiety he or she will feel.

• How the test will feel

  There may be some discomfort while the probe is in the ear, but no harm will result. You will hear a loud tone as the measurements are taken.

• Why the test is performed

  This test measures your ear's responses to the sound and different pressures.

• Normal Values

  The pressure inside the middle ear can vary by 100 daPa (a very small amount). The eardrum should look smooth.

• What abnormal results mean

  Tympanometry may reveal any of the following:

  • A tumor in the middle ear
  • Fluid in the middle ear
  • Impacted ear wax
  • Lack of contact between the conduction bones of the middle ear
  • Perforated ear drum
  • Scarring of the tympanic membrane
• What the risks are

  There are no risks.

• References

  Seidman MD, Simpson GT II, Khan MJ. Common problems of the ear. In: Noble J, eds. Textbook of Primary Care Medicine. 3rd ed. Philadelphia, Pa: Mosby Elsevier; 2001:chap 178.

  Cummings CW, Flint PW, Haughey BH, et al. Otolaryngology: Head & Neck Surgery. 4th ed. St Louis, Mo; Mosby; 2005:3514.

Review Date: 5/13/2009

Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.