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Lab Dept:
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Other Fluids
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Test Name:
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PH FLUID BY METER
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General Information
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Lab Order Codes:
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FPH
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Synonyms:
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Body Fluid pH
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CPT Codes:
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83986 – pH, body fluid, except blood
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Test Includes:
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N/A
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Logistics
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Test Indications:
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The pH of gastric, pleural, peritoneal and synovial fluids can guide in the diagnosis and treatment of ruptures or septic inflammation.
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Lab Testing Sections:
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Chemistry (all specimens tested on the St. Paul campus)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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4 hours
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Special Instructions:
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Send to lab within 30 minutes of collection. See Sample Rejection.
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Specimen
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Specimen Type:
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Fluid, aqueous
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Container:
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Screw capped, sterile vial or plastic syringe, capped
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Draw Volume:
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2 mL fluid
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Processed Volume:
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2 mL preferred (Minimum: 1.5 mL) fluid
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Collection:
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Collect in clean, sterile container
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Special Processing:
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Deliver to laboratory immediately, pH will change with time. Specimens must be tested within 4 hours of collection.
Mpls Staff: Immediately centrifuge specimen to remove cellular material and transport at 4 – 8ºC to St. Paul lab via courier.
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Patient Preparation:
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None
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Sample Rejection:
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Clotted specimen or specimen collected in anticoagulant; specimens more than 4 hours old; highly cellular specimens; mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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<7.3 is suggestive of exudates.
= or >7.3 is found in transudates.
Gastric Aspirates: 1.5 – 3.5
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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Orion pH Meter
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Contraindications:
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N/A
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References:
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Tietz, Norbert (1995) Clincial Guide to Laboratory Tests, 3rd edition, WB Saunders Co, pp 258-261
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Jacobs and DeMott Laboratory Test Handbook (2001) 5th Edition, Lexi-comp Inc.
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Update:
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7/1/2004: Method changed from pH Testr 3™ to Orion pH Meter. Note minimum volume differences between campuses.
8/28/2005: Draw volume previously listed as 5.0 mL.
3/24/2008: Minimum volume increased to 1.5 mL due to new equipment requirements. Previously listed as 0.5 mL.
3/6/2012: Reference ranges updated.
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