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Ova and Parasite Exam

Item Value
Approval req'd? Yes, contact Microbiology at x3-1268 for test requests on patients > 72 hours after admission.
Available Stat? No
Test code P401
Test group Parasites
Performed by Microbiology
In House Availability Monday-Friday, day shift
Method Microscopy
Patient Preparation Patient should be off ALL antibiotics for ≥ 2 weeks before for an O&P examination to be valid.
Collection Instructions SAF vials and instructions available from Material Services (PMM # 44366 Vials SAF Sterile Child Resistant Cap 574-05-CRC-WB).
Outpatients can obtain these from the laboratories' draw stations.

Patient should be off ALL antibiotics for ≥ 2 weeks before an O&P examination.

Collect 3 samples (no more than one per 48 hours) to improve the chance of a positive result.
Container type
Inpatients Clean container
ED/Outpatients SAF collection vial


SAF vials and instructions available from Material Services (PMM # 44366 Vials SAF Sterile Child Resistant Cap 574-05-CRC-WB).
Outpatients can obtain these from the laboratories' draw stations.
Amount to Collect See preferred volume
Sample type Stool ("O&P")
Preferred volume 10 mL stool
Note: for SAF vial fill to red line on container label
Min. Volume 5 mL stool
Note: for SAF vial fill to red line on container label
UCSF Rejection Criteria Unpreserved stool received > 1 hour after collection. Stool in a preservative other than SAF. More than one sample received within 24 hours. 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 Ova & Parasites; O&P; scolex; Protozoan concentration; Coccidia
Stability Unpreserved 1 hour, preserved 2 weeks
Turn around times 1-3 days
Additional information Includes concentration and iron-hematoxylin smear, and Kinyoun stain of unconcentrated sample for Cyclospora and Cryptosporidia.

Also see entries for Giardia lamblia Antigen, Cryptosporidium and Cyclospora, and Microsporidia.
CPT coding 87177, 88313, 87206
LOINC code 10704-5
Last Updated 12/15/2015 10:42:34 AM
Entry Number 719
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