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24912 Ova and Parasites, (Giardia only) Routine

Ova and Parasites, (Giardia only) Routine
Test Code: OPRG
Synonyms/Keywords
​Giardia EIA
O&P, (Giardia only) Routine
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
No​ ​ ​ Feces​ ​ ​ Para-Pak C&S transport or other Cary Blair medium  Para-Pak 10% Formalin, or Sodium acetate formalin (SAF) preservatives One vial of feces in ParaPak C&S transport 5 g stool C&S transport
​ ​ Fresh stool in a clean, leakproof container 5 g​ 1 g​
Swab - Rectal One swab
​Duodenal aspirate ​Fresh in a clean, leakproof container ​1 mL ​0.25 mL
Collection Processing Instructions
​Place fresh stool specimen into a Para-Pak C&S transport collection vial. Add sufficient stool specimen to bring the liquid in the vial to the fill line.
 
If more than one specimen is collected within a 24 hour period, only one will be accepted by the lab.
 
If submitting a duodenal aspirate, the source must be noted for correct testing.
For more information on Specimen Collection Media/Swab, see Specimen Transport Pictorial.
Specimen Stability Information
Specimen Type Temperature Time
Par-Pak C&S (Cary Blair)​ ​Refrigerate ​< or = 4 days
Preserved Feces​ Room Temperature 2 months
Refrigerated
​Fresh feces, rectal swabs ​ Refrigerated ​< or = 48 hours
​Frozen ​> 48 hours
​Duodenal aspirate, (Cary Blair) ​Refrigerate ​< or = 4 days
​Duodenal aspirate, fresh Room Temperature​ ​< or = 2 hours
Rejection Criteria
Feces containing barium
Merthiolate iodine formalin (MIF), PVA only​
Rectal swab, fresh feces >48 hours old if not frozen
​Unpreserved duodenal aspirates > 2 hours old
​Leaking specimens
​Feces in Para-Pak ZN-PVA Fixative only
Feces in Total-Fix vial​
​> 1 specimen collected within 24 hour period
Interference
​Barium
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Diagnostic Treatment Center​ ​Monday through Sunday ​Less than 2 hours​ ​ProSpecT Giardia Microplate EIA​
​Marshfield Monday through Friday, excluding holidays​ Less than 2 hours​ ProSpecT Giardia Microplate EIA​
Test Information

​Detects Giardia antigen only. Giardia is one of the most common protozoan parasites encountered in the US and represent 85% of all significant parasites recovered in our laboratory. Therefore, routine O & P screens only for these organisms. This EIA method had a sensitivity and specificity >95% for these two organisms. Only a single sample is recommended. Complete microscopic examination is available but should be reserved for patients who have a history of travel or residency in a developing country, AIDS patients, patients in whom roundworms or tapeworms are suspected, or patients in whom symptoms persist despite a negative test for Cryptosporidium and Giardia. See Ova and Parasites, Special if complete examination is needed.

Duodenal fluid - Giardia, Cryptosporidium and Strongyloides are the typical pathogens seen in the duodenum. For Strongyloides see Ova and Parasites, Special in our test reference manual.

Reference Range Information
Performing Location Reference Range
All Performing Sites Negative for Giardia​
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
​87329 Giardia​
Synonyms/Keywords
​Giardia EIA
O&P, (Giardia only) Routine
Ordering Applications
Ordering Application Description
​Centricity ​O&P, Routine (Giardia only)
​Cerner ​O and P, Routine (Giardia only)
​Clinical Order Manager O&P, (Giardia only) Routine
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
No​ ​ ​ Feces​ ​ ​ Para-Pak C&S transport or other Cary Blair medium  Para-Pak 10% Formalin, or Sodium acetate formalin (SAF) preservatives One vial of feces in ParaPak C&S transport 5 g stool C&S transport
​ ​ Fresh stool in a clean, leakproof container 5 g​ 1 g​
Swab - Rectal One swab
​Duodenal aspirate ​Fresh in a clean, leakproof container ​1 mL ​0.25 mL
Collection Processing
​Place fresh stool specimen into a Para-Pak C&S transport collection vial. Add sufficient stool specimen to bring the liquid in the vial to the fill line.
 
If more than one specimen is collected within a 24 hour period, only one will be accepted by the lab.
 
If submitting a duodenal aspirate, the source must be noted for correct testing.
For more information on Specimen Collection Media/Swab, see Specimen Transport Pictorial.
Specimen Stability Information
Specimen Type Temperature Time
Par-Pak C&S (Cary Blair)​ ​Refrigerate ​< or = 4 days
Preserved Feces​ Room Temperature 2 months
Refrigerated
​Fresh feces, rectal swabs ​ Refrigerated ​< or = 48 hours
​Frozen ​> 48 hours
​Duodenal aspirate, (Cary Blair) ​Refrigerate ​< or = 4 days
​Duodenal aspirate, fresh Room Temperature​ ​< or = 2 hours
Rejection Criteria
Feces containing barium
Merthiolate iodine formalin (MIF), PVA only​
Rectal swab, fresh feces >48 hours old if not frozen
​Unpreserved duodenal aspirates > 2 hours old
​Leaking specimens
​Feces in Para-Pak ZN-PVA Fixative only
Feces in Total-Fix vial​
​> 1 specimen collected within 24 hour period
Interference
​Barium
Reference Range Information
Performing Location Reference Range
All Performing Sites Negative for Giardia​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Diagnostic Treatment Center​ ​Monday through Sunday ​Less than 2 hours​ ​ProSpecT Giardia Microplate EIA​
​Marshfield Monday through Friday, excluding holidays​ Less than 2 hours​ ProSpecT Giardia Microplate EIA​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
​87329 Giardia​
For most current information refer to the Marshfield Laboratory online reference manual.