Otitis externa laboratory findings: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
|||
| Line 11: | Line 11: | ||
*Otitis externa from a suspected [[bacterial]] infection will be determined by the following tests: | *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 ''[[Pseudomonas 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> | **Swab of the [[ear canal]] to determine if the infection is caused by ''[[Pseudomonas 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 | ***This test will be performed in the event that the symptoms do not resolve with the 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> | **[[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 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 ''[[Pseudomonas aeruginosa]]''. | ***Results that are pink: indicates that the culture is [[gram-negative]] and is indicative of ''[[Pseudomonas aeruginosa]]''. | ||
==References== | ==References== | ||
Revision as of 20:19, 18 May 2016
|
Otitis externa Microchapters |
|
Diagnosis |
|---|
|
Treatment |
|
Case Studies |
|
Otitis externa laboratory findings On the Web |
|
American Roentgen Ray Society Images of Otitis externa laboratory findings |
|
Risk calculators and risk factors for Otitis externa laboratory findings |
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 Pseudomonas aeruginosa or Staphylococcus aureus.[1]
- This test will be performed in the event that the symptoms do not resolve with the 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 Pseudomonas aeruginosa.
- Swab of the ear canal to determine if the infection is caused by Pseudomonas aeruginosa or Staphylococcus aureus.[1]