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Test Code PHV pH Venous, LAB75

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Green-top (lithium heparin) tube

Acceptable: Heparinized syringe

Specimen Volume:150 uL of heparinized whole blood

Stability: Samples should be placed in ice water if they can not be run within 30 min.

Collection Instructions: Specimen must be kept as anaerobic as possible.

Reference Values

7.35-7.45 units

Critical values

0-30 days: <7.2 units or >7.5 units

≥1 month: <7.2 units or >7.6 units

Useful For

The blood pH is useful in the assessment of the acid-base status of a patient.

Day(s) Test Set Up

Monday through Sunday


Potentiometric Sensors: Includes pH

Test Classification and CPT Coding