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Test Code 256 pH, Venous

Additional Codes


PowerChart: pH Venous

Epic: LAB75 pH, Venous

Test Method

Direct Potentiometry; iSTAT, iSTAT Corporation

Specimen Requirement

1 mL heparin, venous whole blood.

Additional Specimen Collection Information

Collect venous blood into an ABG syringe. Samples may be stored at room temperature for 10 minutes or on wet ice for 30 minutes.


Testing is performed Monday through Sunday.

Routine orders: Typically completed within 4 hour after the specimen arrives at the testing site.

STAT orders: Typically completed within 15 minutes after the specimen arrives at the testing site.

Reference Values


Useful For

Monitoring venous pH

CPT Code Information

82800 Chemisty; Gases, blood, pH only

LOINC Code Information

2746-6 pH Of Venous Blood

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