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Nasopharyngeal culture
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Nasopharyngeal culture

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Culture - nasopharyngeal; Swab for respiratory viruses; Swab for Staph carriage

Nasopharyngeal culture is a test that examines a sample of secretions from the uppermost part of the throat, behind the nose, to detect organisms that can cause disease.

I Would Like to Learn About:

  • How the Test is Performed

    You will be asked to cough before the test begins and then tilt your head back. A sterile cotton-tipped swab is gently passed through a nostril and into the nasopharynx. This is the part of the pharynx that covers the roof of the mouth. The swab is quickly rotated and removed. The sample is sent to a laboratory. There, it is placed in a special dish (culture). It is then watched to see if bacteria or other disease-causing organisms grow.

  • How to Prepare for the Test

    No special preparation is needed.

  • How the Test will Feel

    You may have slight discomfort and may gag.

  • Why the Test is Performed

    The test identifies viruses and bacteria that cause upper respiratory tract symptoms.

    • Bordetella pertussis
    • Neisseria meningitidis
    • Staphylococcus aureus
    • Methicillin-resistant Staphylococcus aureus

    The culture may be used to help determine which antibiotic is appropriate to treat an infection due to bacteria.

  • Normal Results

    The presence of organisms commonly found in the nasopharynx is normal.

  • What Abnormal Results Mean

    The presence of any disease-causing virus, bacteria, or fungus means these organisms may be causing your infection.

    Sometimes organisms like Staphylococcus aureus can be present without causing disease. This test can help identify resistant strains of this organism (methicillin-resistant Staphylococcus aureus, or MRSA) so that patients can be isolated when necessary.

  • Risks

    There are no risks with this test.

Related Information

     

References

Murray PR, Witebsky FG. The clinician and the microbiology laboratory. In: Mandell GL, Bennett JE, Dolin R, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 17.

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Review Date: 12/3/2013  

Reviewed By: Denis Hadjiliadis, MD, Associate Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

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