training_koh presentation for wet mount training
TRANSCRIPT
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7/31/2019 Training_KOH Presentation for Wet Mount Training
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Reading KOH Wet Preps
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Reading KOH Wet Preps
In order to visualize yeast more easily in vaginal fluid,KOH is used to lyse bacteria and epithelial cells leavingonly yeast and their pseudohyphae (long tubularstructures produced by some yeast) present.
Hairs, threads from material and other artifacts can bepresent in the sample and these can be mistaken forpseudohyphae.
Not all species of yeast produce pseudohyphae andbudding yeast present in the sample must be used todetermine if a yeast infection is present. Yeast are much
larger than bacteria and are approximately the size andshape of the nuclei of epithelial cells. Therefore nucleifrom cells released after lysing can be present andmistaken for yeast.
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Reading KOH Wet Preps
The following tips can be utilized in order to correctlyidentify pseudohyphae and yeast in a wet prep.1. Pseudohyphae must have yeast budding off of the tubularstructure in order for it to be correctly identified as pseudohyphae. Ifthere are no buds present, it is not pseudohyphae.
2. In order for yeast not to be mistaken for nuclei of cells, they mustbe budding. This form resembles a larger oval with a smaller ovalattached at one end. Without the bud, the yeast would look like anuclei.
Example:
BudPseudohyphae with buds
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Reading KOH Wet Preps
Please view the following slides to see
these tips utilized.
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Artifacts
No yeast budding off
of the structures areobserved. This can
not be called
pseudohyphae.
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ArtifactNote: No budding yeast are observed
coming off of the structure. The size is too
large and the shape is not consistent with
pseudohyphae.
Pseudohyphae
Budding yeast
Note: Please note the size of the
epithelial cells in relation to the
actual pseudohyphae and the
artifact.
Epithelial cell
Epithelial cell
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Pseudohyphae
Note: All of the
budding structures
coming off.
This structure is more than likely pseudohyphae,
but if this was by itself in the wet mount, it
should not be called positive for pseudohyphae
because there are no buds coming off of it. Epithelial cell
Epithelial cell
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Pseudohyphae
Bud
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Artifact
Structure is too large and
the shape is not
consistent withpseudohyphae.
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Pseudohyphae
Bud
Bud
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Artifact
Pseudohyphae
Bud
Bud
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Artifact
No budding yeast
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PseudohyphaeBudding yeast
EpithelialEpi
Epithelial
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EpithelialEpithelial
Epithelial
Pseudohyphae
BudBud
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Epithelial Cell
Budding Yeast
Note: These are probably
yeast, but cannot be called
so because they are not
budding.