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Giardia Antigen

Item Value
Approval req'd? No
Available Stat? No
Test code P413
Performed by Microbiology
In House Availability Thursday, day shift
Method EIA
Collection Instructions Unpreserved stool not placed in SAF within 1 hour of collection. Stool in a preservative other than SAF. Stool not mixed well in SAF, or if preservative has been poured out. SAF container filled past the red line on the container label.

Giardia antigen testing cannot be performed on aspirates. A P401 Ova and Parasite exam can be ordered to look for Giardia microscopically.
Container type SAF vial
Amount to Collect See preferred volume
Sample type SAF preserved stool
Preferred volume SAF vial filled to red line on label. Do not overfill.
Min. Volume 5 mL
UCSF Rejection Criteria Unpreserved stool received >1 hour after collection. Stool in a preservative other than SAF. Stool not mixed well in SAF, or if preservative has been poured out. SAF container filled past the red line on the container label.
Processing notes Transfer unpreserved stool to SAF preservative upon receipt in lab.
Normal range Negative
Synonyms Giardiasis
Stability Room temperature:
Unpreserved stool 1 hour
Stool in SAF 2 months
Turn around times 1-7 days
Additional information This test should be used only if other parasitic infections not detected by this highly specific procedure are considered unlikely on clinical grounds or have been excluded by routine stool examinations for O&P. The test can be used to follow infected patients for loss of carriage (at no more than weekly intervals), to investigate their contacts, or when-despite the failure to demonstrate it by stool examination a high suspicion of Giardia infection persists. Sensitivity of this test for parasite antigen is 96%, compared to a sensitivity of 74% for the microscopic examination of a single stool sample; specificity is thought to be 100%.
CPT coding 87329
LOINC code 6412-1
Last Updated 12/6/2017 10:30:34 AM
Entry Number 419
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