Geisinger Proven Diagnostics Test Catalog

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Test code:
Specimen type:
Whole blood
Collection container:
Specimen Required:
1 mL whole blood; minimum 0.4 mL.
Special notes:
Expel excess air from syringe. Mix well immediately after collection. Due to sample instability, this test may only be collected and analyzed at GMC and GWV.

Transport temperature:
Room temperature (preferred). Transport immediately. If delay in transport is anticipated, place specimen on an ice slurry.
Specimen stability:
Stable 30 minutes at room temperature, 1 hour on an ice slurry.
Rejection criteria:
Stability limits exceeded (greater than 30 minutes at room temperature) or greater than 1 hour from time of collection when on ice slurry), specimens containing large clots or air bubbles.

Reference range:
pH, 7.30 - 7.40; pCO2, 32 - 44; pO2, 23 - 35; Base excess (calculated) -2 to -6
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Cord Blood pH, pCO2, pO2, base excess (calculated)
Cord blood
Clinical Significance:
Cord blood gases are typically drawn from the umbilicus during delivery to document oxygenation status of the newborn during delivery. Acidosis (pH less than 7.1 in an arterial cord blood gas) may indicate blood flow and hence oxygenation from mother to newborn may have been occluded during delivery.

The Umbilical Artery is where the baby's venous circulation dumps unoxygenated blood. This is blood that was on its way back to the mom's heart and lungs to pick up oxygen. Thus, when you draw a cord gas for you will want to draw from one of the two Umbilical Arteries.

Blood from the Umbilical Artery is called a Cord Arterial Blood Gas (BGCA), and basically shows how the baby was doing prior to birth.

Occasionally both arterial and venous cord blood specimens may be drawn to judge the difference in acidosis coming from fetal and maternal sources.
Doctoral Director Review:
Hoi-Ying Elsie Yu Ph.D.     Review Date: 10/17/2014

Performing Locations

Geisinger Medical Center

Performing laboratory: Stat Lab
Technical Lead: Karen Mankins
Frequency: Daily, Monday-Sunday
Performed stat? Y

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Technical Lead: Melissa Whetstone    
Frequency: Daily, all shifts    
Performed stat? Y