Otitis externa laboratory findings: Difference between revisions
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__NOTOC__ | __NOTOC__ | ||
{{Otitis externa}} | {{Otitis externa}} | ||
{{CMG}} | {{CMG}}{{AE}}{{LRO}} | ||
==Overview== | |||
==Laboratory Findings== | |||
Laboratory findings will vary based on the suspected source of otitis externa. | |||
===Bacterial=== | |||
*Otitis externa from a suspected [[bacterial]] infection will be determined by the following tests: | |||
**Swab of the [[ear canal]] to determine if the infection is caused by ''[[Psuedomonas aeruginosa]]'' or ''[[Staphylococcus aureus]]''.<ref name="LlorMcNulty2014">{{cite journal|last1=Llor|first1=C.|last2=McNulty|first2=C. A. M.|last3=Butler|first3=C. C.|title=Ordering and interpreting ear swabs in otitis externa|journal=BMJ|volume=349|issue=sep01 2|year=2014|pages=g5259–g5259|issn=1756-1833|doi=10.1136/bmj.g5259}}</ref> | |||
***This test will be performed in the event that the symptoms do not relieve with treatment and the otitis externa becomes recurrent | |||
**[[Gram stain]] test: If the cause is determined to be [[bacterial]], the gram-stain test will determine whether the cause is ''[[Psuedomonas aeruginosa]]'' or ''[[Staphylococcus aureus]]'':<ref name="pmid11475313">{{cite journal |vauthors=Beveridge TJ |title=Use of the gram stain in microbiology |journal=Biotech Histochem |volume=76 |issue=3 |pages=111–8 |year=2001 |pmid=11475313 |doi= |url=}}</ref> | |||
***Results are purple: indicates that the culture is [[gram-positive]] and is indicative of ''[[Staphylococcus aureus]]''. | |||
***Results that are pink: indicates that the culture is [[gram-negative]] and is indicative of ''[[Psuedomonas aeruginosa]]''. | |||
==References== | ==References== | ||
{{reflist|2}} | {{reflist|2}} | ||
[[Category:Primary care]] | [[Category:Primary care]] | ||
[[Category:Disease]] | [[Category:Disease]] | ||
Revision as of 20:12, 18 May 2016
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.
Overview
Laboratory Findings
Laboratory findings will vary based on the suspected source of otitis externa.
Bacterial
- Otitis externa from a suspected bacterial infection will be determined by the following tests:
- Swab of the ear canal to determine if the infection is caused by Psuedomonas aeruginosa or Staphylococcus aureus.[1]
- This test will be performed in the event that the symptoms do not relieve with treatment and the otitis externa becomes recurrent
- Gram stain test: If the cause is determined to be bacterial, the gram-stain test will determine whether the cause is Psuedomonas aeruginosa or Staphylococcus aureus:[2]
- Results are purple: indicates that the culture is gram-positive and is indicative of Staphylococcus aureus.
- Results that are pink: indicates that the culture is gram-negative and is indicative of Psuedomonas aeruginosa.
- Swab of the ear canal to determine if the infection is caused by Psuedomonas aeruginosa or Staphylococcus aureus.[1]