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Test Code UVBG Blood Gases, Umbilical Vein, LAB2471

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized syringe with venous cord blood.

Specimen Volume: 65 uL venous 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: 7.22-7.44 units

Critical pH:  <7.00

pCO2: 30-63 mm Hg

pO2: 90-323 mm Hg
HCO3: 20.0-28.0 mmol/L
CO2: 21.0-29.0 mmol/L

Base excess: -6.0 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.


Potentiometric Sensors: Includes pCO2 and pH.

Amperometric Sensors: Includes pO2.

Test Classification and CPT Coding