Giardiasis laboratory findings: Difference between revisions
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*Stool ova and parasites exam | *Stool ova and parasites exam | ||
*String test (rarely performed) | *String test (rarely performed) | ||
==Microscopy== | |||
[[Image:giardia.jpg|right|thumb|400px|This picture shows multiple views of a single Giardia lamblia (intestinalis) cyst as imaged at different instrument settings by confocal microscopy.Bar = 10 micrometres.<br />(A) is the cyst imaged by transmission (differential interference contrast), only.<br />(B) is the cyst wall selectively imaged through use of fluorescent-labelled (TRITC) antibody that is cyst wall specific.</br>(C) is the cyst imaged through use of carboxy fluorescein diacetate, a viability stain.<br />(D) is a composite image of (B) and (C).<br />(E) is a composite image of (A), (B), and (C).]] | |||
Under a normal compound light [[microscope]], ''Giardia'' often looks like a "clown face," with two nuclei outlined by adhesive discs above dark [[median bodies]] that form the "mouth." Cysts have four nuclei. | |||
==References== | ==References== | ||
Revision as of 21:53, 1 March 2016
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Giardiasis Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Giardiasis laboratory findings On the Web |
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American Roentgen Ray Society Images of Giardiasis laboratory findings |
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Risk calculators and risk factors for Giardiasis laboratory findings |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
While most sources suggest that commonly used tests for giardia are unreliable, a new immunologic test referred to as ELISA, for enzyme-linked immunosorbent assay are now available. These tests are capable of a 90 percent detection rate or more.
Laboratory Findings
Tests that may be done include:
- Enteroscopy
- Stool antigen test to check for Giardia
- Stool ova and parasites exam
- String test (rarely performed)
Microscopy
(A) is the cyst imaged by transmission (differential interference contrast), only.
(B) is the cyst wall selectively imaged through use of fluorescent-labelled (TRITC) antibody that is cyst wall specific.
(C) is the cyst imaged through use of carboxy fluorescein diacetate, a viability stain.
(D) is a composite image of (B) and (C).
(E) is a composite image of (A), (B), and (C).
Under a normal compound light microscope, Giardia often looks like a "clown face," with two nuclei outlined by adhesive discs above dark median bodies that form the "mouth." Cysts have four nuclei.
References