Geisinger Medical Laboratories Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB3458             Geisinger Epic ID: 37251

Specimen type:
Whole blood
Preferred 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 a performing laboratory site (see below).

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 interval:
pH, 7.23 - 7.33; pCO2, 41 - 57 mmHg; pO2, 12 - 24; Base excess -6 to -2 mmol/L.
Critical values/courtesy alerts:
pH <7.150
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, blood gas cord blood
Clinical significance:
Cord blood gases are sometimes 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) suggests blood flow / oxygenation from mother to newborn may have been occluded during delivery.

The umbilical artery carries deoxygenated blood from the fetus to the placenta in exchange for oxygen. It, therefore, reflects fetal metabolism and well-being.
Doctoral Director(s:)
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM
Sheng-Ying (Margaret) Lo, PhD, DABCC    
Review Date: 12/14/2022

Performing Locations

Geisinger Medical Center

Performing laboratory: Stat Lab
Technical Lead: Karen Delp
Frequency: Daily, Monday-Sunday
Performed STAT? Yes

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Technical Lead: Danielle Mostowski    
Frequency: Daily, all shifts    
Performed STAT? Yes

Geisinger Bloomsburg Hospital

Performing laboratory: Chemistry
Technical Lead: Robyn Stokes  
Frequency: Daily, all shifts    
Performed STAT? Yes

Geisinger Community Medical Center

Performing laboratory: Chemistry
Technical Lead: Ann Mack, Deborah Dempsey  
Frequency: Daily all shifts    
Performed STAT? Yes

Geisinger Lewistown Hospital

Performing laboratory: Chemistry
Technical Lead: Jane Kifer  
Frequency: All shifts    
Performed STAT? Yes
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