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Lab Dept:
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Chemistry
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Test Name:
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VENOUS PH
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General Information
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Lab Order Codes:
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VPH
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Synonyms:
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Venous pH
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CPT Codes:
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82800 - Gases, blood, pH only
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Test Includes:
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pH on venous blood
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Logistics
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Test Indications:
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Useful for evaluating acid/base balance, especially in diabetic ketoacidosis.
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Lab Testing Sections:
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Chemistry
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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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30 minutes
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Special Instructions:
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See Collection and Patient Preparation
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Preferred: Sims Portex® syringe (PB151) or Smooth-E syringe (956-463)
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Draw Volume:
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0.4 mL (Minimum: 0.2 mL) blood
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Processed Volume:
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0.2 mL blood
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Collection:
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Draw blood into blood gas syringe. Avoid use of a tourniquet. Immediately remove all air from syringe, remove needle, cap tightly, and mix. Forward immediately at ambient temperature.
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Special Processing:
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Lab Staff: Deliver the specimen to the blood gas testing station. Testing must be completed within 30 minutes of collection.
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Patient Preparation:
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The patient should be in a relaxed and steady state.
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Sample Rejection:
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Mislabeled or unlabeled specimens; non-heparinized samples; collection times exceeding 30 minutes and clotted samples; specimens containing air
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Interpretive
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Reference Range:
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PH: 7.31 - 7.41
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Critical Values:
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pH: <7.2 or >7.6
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Limitations:
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N/A
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Methodology:
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Ion-Selective Electrode
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References:
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Tietz Norbert (1999) Clincial Guide to Laboratory Tests, 3rd edition, WB Saunders Co
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ABL800 FLEX Operator’s Manual from software version 6.00
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Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp
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