Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

VENOUS PH

General Information

Lab Order Codes:

VPH

Synonyms:

Venous pH

CPT Codes:

82800 - Gases, blood, pH only

Test Includes:

pH on venous blood

Logistics

Test Indications:

Useful for evaluating acid/base balance, especially in diabetic ketoacidosis.

Lab Testing Sections:

Chemistry

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

30 minutes

Special Instructions:

See Collection and Patient Preparation

Specimen

Specimen Type:

Whole blood

Container:

Preferred: Sims Portex syringe (PB151) or Smooth-E syringe (956-463)

Draw Volume:

0.4 mL (Minimum: 0.2 mL) blood

Processed Volume:

0.2 mL blood

Collection:

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.

Special Processing:

Lab Staff: Deliver the specimen to the blood gas testing station. Testing must be completed within 30 minutes of collection.

Patient Preparation:

The patient should be in a relaxed and steady state.

Sample Rejection:

Mislabeled or unlabeled specimens; non-heparinized samples; collection times exceeding 30 minutes and clotted samples; specimens containing air

Interpretive

Reference Range:

PH: 7.31 - 7.41

Critical Values:

pH: <7.2 or >7.6

Limitations:

N/A

Methodology:

Ion-Selective Electrode

References:

Tietz Norbert (1999) Clincial Guide to Laboratory Tests, 3rd edition, WB Saunders Co

ABL800 FLEX Operator’s Manual from software version 6.00

Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp



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