Blastomycosis laboratory findings: Difference between revisions
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__NOTOC__ | __NOTOC__ | ||
{{Blastomycosis}} | {{Blastomycosis}} | ||
{{CMG}}; {{AE}}; {{VB}} | {{CMG}}; {{AE}}; {{VB}} {{ADG}} | ||
==Overview== | ==Overview== | ||
Once suspected, the diagnosis of blastomycosis can usually be confirmed by demonstration of the characteristic broad based budding organisms in | Once suspected, the diagnosis of blastomycosis can usually be confirmed by demonstration of the characteristic [[Budding|broad based budding organisms]] in [[sputum]] or [[tissues]] by [[KOH test|KOH prep]], [[cytology]], or [[histology]]. | ||
==Laboratory Findings== | ==Laboratory Findings== | ||
*Culture of the [[organism]] is the definitive [[diagnostic test]] in diagnosing blastomycosis, but due to slow growing nature of the [[organism]] it can delay in treatment up to several weeks. <ref name="pmid20375357">{{cite journal |vauthors=Saccente M, Woods GL |title=Clinical and laboratory update on blastomycosis |journal=Clin. Microbiol. Rev. |volume=23 |issue=2 |pages=367–81 |year=2010 |pmid=20375357 |pmc=2863359 |doi=10.1128/CMR.00056-09 |url=}}</ref> | |||
*Culture on dextrose sabourd [[agar]] at 25 to 30°C for 4 to 6 weeks is normally employed. Highest diagnostic yield is of [[bronchoscopy]] derived [[fluid]], followed by sputum. | |||
[[ | *Real time [[PCR]] is being experimentally tested for direct diagnosis from culture or tissue. <ref name="Sidamonidze-2012">{{Cite journal | last1 = Sidamonidze | first1 = K. | last2 = Peck | first2 = MK. | last3 = Perez | first3 = M. | last4 = Baumgardner | first4 = D. | last5 = Smith | first5 = G. | last6 = Chaturvedi | first6 = V. | last7 = Chaturvedi | first7 = S. | title = Real-time PCR assay for identification of Blastomyces dermatitidis in culture and in tissue. | journal = J Clin Microbiol | volume = 50 | issue = 5 | pages = 1783-6 | doi = 10.1128/JCM.00310-12 | PMID = 22403418 }}</ref> | ||
{| class="wikitable" | |||
!Infection | |||
!Specimen | |||
|- | |||
|[[Pneumonia]] | |||
|[[Sputum|Sputum,]] [[bronchoalveolar lavage]] | |||
|- | |||
|[[Cutaneous]] lesions | |||
|Deep [[tissue]] [[biopsy]], scrapings and [[exudate]] | |||
|- | |||
|Oseous lesions | |||
|Joint fluid, [[synovial]] [[tissue]] [[biopsy]] specimen | |||
|- | |||
|Genitourinary | |||
| | |||
[[Prostate]] biopsy specimen, [[urine]] | |||
|- | |||
|CNS | |||
|[[Cerebrospinal fluid]] | |||
|} | |||
*[[KOH test|KOH]] preparation - shows a broad based budding yeast multinucleate yeast cell, round to [[oval]], 8 to 15 μm in diameter with thick, refractile cell walls. [[Periodic acid-Schiff stain|Periodic acid-Schiff stain (PAS)]], PAS with [[Hematoxylin and eosin stain|hematoxylin counterstain]], and Grocott-Gomori's methenamine silver stain are some of the stains employed. | |||
* Tissue [[biopsy]] of [[skin]] or other [[organs]] may be required in order to diagnose extra-pulmonary disease. A [[granulomatous]] [[inflammation]] might be suggestive of [[fungal]] presence but is not diagnostic. | |||
* Commercially available urine antigen testing appears to be quite sensitive in suggesting the diagnosis in cases where the organism is not readily detected. It appears to be more helpful than serum antigen testing. | |||
* | *[[Serological testing]] is limited in utility by the fact that there is a considerable overlap with other fungal antigens. | ||
*Sometimes [[blood]] and sputum cultures may not detect [[blastomycosis]], lung biopsy is another option, and results will be shown promptly. | |||
==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} | ||
{{WS}} | |||
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[[Category:Disease]] | [[Category:Disease]] | ||
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[[Category:Otolaryngology]] | |||
[[Category:Urology]] | |||
[[Category:Dermatology]] | [[Category:Dermatology]] | ||
[[Category:Emergency medicine]] | |||
[[Category:Infectious disease]] | |||
[[Category:Neurology]] | |||
[[Category:Orthopedics]] | |||
[[Category:Pulmonology]] | [[Category:Pulmonology]] | ||
Latest revision as of 20:37, 29 July 2020
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: ; Vidit Bhargava, M.B.B.S [2] Aditya Ganti M.B.B.S. [3]
Overview
Once suspected, the diagnosis of blastomycosis can usually be confirmed by demonstration of the characteristic broad based budding organisms in sputum or tissues by KOH prep, cytology, or histology.
Laboratory Findings
- Culture of the organism is the definitive diagnostic test in diagnosing blastomycosis, but due to slow growing nature of the organism it can delay in treatment up to several weeks. [1]
- Culture on dextrose sabourd agar at 25 to 30°C for 4 to 6 weeks is normally employed. Highest diagnostic yield is of bronchoscopy derived fluid, followed by sputum.
- Real time PCR is being experimentally tested for direct diagnosis from culture or tissue. [2]
| Infection | Specimen |
|---|---|
| Pneumonia | Sputum, bronchoalveolar lavage |
| Cutaneous lesions | Deep tissue biopsy, scrapings and exudate |
| Oseous lesions | Joint fluid, synovial tissue biopsy specimen |
| Genitourinary | |
| CNS | Cerebrospinal fluid |
- KOH preparation - shows a broad based budding yeast multinucleate yeast cell, round to oval, 8 to 15 μm in diameter with thick, refractile cell walls. Periodic acid-Schiff stain (PAS), PAS with hematoxylin counterstain, and Grocott-Gomori's methenamine silver stain are some of the stains employed.
- Tissue biopsy of skin or other organs may be required in order to diagnose extra-pulmonary disease. A granulomatous inflammation might be suggestive of fungal presence but is not diagnostic.
- Commercially available urine antigen testing appears to be quite sensitive in suggesting the diagnosis in cases where the organism is not readily detected. It appears to be more helpful than serum antigen testing.
- Serological testing is limited in utility by the fact that there is a considerable overlap with other fungal antigens.
- Sometimes blood and sputum cultures may not detect blastomycosis, lung biopsy is another option, and results will be shown promptly.
References
- ↑ Saccente M, Woods GL (2010). "Clinical and laboratory update on blastomycosis". Clin. Microbiol. Rev. 23 (2): 367–81. doi:10.1128/CMR.00056-09. PMC 2863359. PMID 20375357.
- ↑ Sidamonidze, K.; Peck, MK.; Perez, M.; Baumgardner, D.; Smith, G.; Chaturvedi, V.; Chaturvedi, S. "Real-time PCR assay for identification of Blastomyces dermatitidis in culture and in tissue". J Clin Microbiol. 50 (5): 1783–6. doi:10.1128/JCM.00310-12. PMID 22403418.