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Test Code UABG Blood Gas, Arterial, Cord, LAB1398

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized syringe with arterial cord blood.

Specimen Volume: 65 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: 7.14-7.42 units

Critical pH: <7.00

pCO2: 34-78 mm Hg

pO2: 34-78 mm Hg
HCO3: 19.4-26.4 mmol/L

CO2: 23-300 mmHg
Base excess: -7.0 to +2.0 mmol/L

% O2 saturation: no reference range established

Day(s) Test Set Up

Monday through Sunday

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.


Ion-Selective Electrode (ISE)

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

Test Classification and CPT Coding