Laboratory Fee Schedule
Procedure: MZZ0450A
CPT: 87798
| Synonym(s): | Norwalk-like virus, stool |
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| Requisition Form | G-2B |
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| Test Description | PCR test designed to detect the presence of RNA from human noroviruses and the Norwalk-like virus genera |
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| Pre-Approval Needed | N/A |
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| Supplemental Information Required | N/A |
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| Supplemental Form(s) | N/A |
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| Performed on Specimens from (sources) | Human |
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| Sample/Specimen Type for Testing | Stool (raw or in Cary-Blair transport medium) |
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| Minimum Volume/Size Required | - 500 µL if stool is loose, liquid or in Cary-Blair medium
- A pea-sized amount(~0.2g) of raw stool
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| Storage/Preservation Prior to Shipping | - Store raw stool specimens between 2°C–8°C on frozen ice packs, or frozen on dry ice.
- Ship raw stool in a clean, dry, sealable container.
- Store stool in Cary-Blair medium either cold between 2°C–8°C, or at ambient temperature.
- Do not freeze specimens in Cary-Blair medium.
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| Transport Medium | N/A |
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| Specimen Labeling | - At least two patient-specific identifiers required on specimen (e.g., patient full name, date of birth, medical record number).
- Three unique patient identifiers are preferred.
- Patient identifiers on specimen label must exactly match identifiers on submission form. (e.g., abbreviated name on label and full name on form is not acceptable.)
- Additional DSHS Laboratory specimen labeling guidelines available online here.
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| Shipping and Specimen Handling Requirements | - Raw stool: Ship refrigerated at 2°C–8°C on frozen cold packs or frozen on dry ice for overnight delivery.
- Cary-Blair stool specimens should be prepared using manufacturer-provided guidance.
- Do not freeze stool specimens in Cary-Blair.
- Use multiple frozen cold packs when shipping cold.
- Ship according to Dangerous Goods Regulations, IATA, and/or CFR 49.
- Category B Biological Substance, UN3373 shipping requirements apply.
- Ship specimens overnight Monday–Thursday to avoid weekend deliveries.
- Submitters are responsible for packaging and shipping specimens according to regulatory requirements.
- Additional DSHS Laboratory specimen shipping guidelines online here.
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| Method | Real-time PCR |
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| Turn-around Time | 48 business hours from receipt of specimen |
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| Interferences/Limitations | Heme (from hemoglobin) interferes with PCR in this assay. |
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| Common Causes for Rejection | - insufficient specimen volume
- mismatch(es) between patient identifiers on G-2B submission form and specimen label
- bloody stool
- dried stool
- improper storage conditions
- raw stool specimens received at ambient temperature
- Cary-Blair specimens received frozen
- failure to meet specimen submission or shipping requirements
- missing/incomplete/illegible submission form
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| Additional Information | PCR test may be paired with bacteriological culture. |
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