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Test Code UABG Blood Gas, Arterial, Cord, LAB1398


Ion-Selective Electrode (ISE)

Includes pH, pCO2, pO2, bicarbonate (HCO3), CO2, base excess, and % O2 saturation.

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized syringe with arterial cord blood.

Specimen Volume: 150 uL of arterial cord 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.

               Cord blood samples are ordered and resulted under the mother’s name and account.

Reference Values

pH: 7.22-7.32 units

pCO2: 40-60 mm Hg

pO2: 23-33 mm Hg
HCO3: 19.4-26.4 mmol/L

CO2: no reference range established
Base excess: -6.1 to -0.5 mmol/L

% O2 saturation: no reference range established

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

Umbilical cord gases are usually performed for the assessment of either the acid-base status or the respiratory oxygenation status of a newborn infant.