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Test Code INPT225 Arterial Blood Gas

Synonym

  • GAS5

Profile Information

Reporting Name Available Separately Always Reported
pH No Yes
pCO2 No Yes
pO2 No Yes
HCO3 No Yes
sO2 No Yes
Base Excess No Yes
FIO2 No Yes

Specimen Required

Preferred Container/Tube: Dry Lithium Heparin Syringe
Acceptable Container/Tube: Dry Lithium Heparin Syringe
Specimen Volume: Full syringe
Specimen Minimum Volume: Full syringe

Specimen Stability Information

Ambient: 30 minutes
Refrigerated: 30 minutes

Rejected Due To

  • Unacceptable container type
  • Quantity not sufficient
  • Clotted specimens
  • Received >30 minutes from collection time

Reference Values

pH
0-29 days: 7.29-7.45
30+ days: 7.35-7.45

 

pCO2
0-29 days: 27-40 mm Hg
30+ days: 32-48 mm Hg

 

pO2
83-108 mm Hg

 

HCO3
0-29 days: 17-24 mmol/L
30+ days: 22-28 mmol/L

 

sO2
0-365 days: 40-90 %
1+ years: 94-98 %

 

Base Excess
-3.0-3.0 mmol/L

Cautions

Contamination of samples with ambient air will drive the pO2 to equilibrate with ambient air (150 mmHg) leading to falsely low or falsely elevated results depending on the initial pO2 level; as well as falsely decrease the pCO2; and falsely increase the pH, which will also affect the portion of calcium bound to protein. Therefore, care should be taken to expel all air bubbles from all blood gas samples.

Syringes that are not completely filled will have increased heparin concentrations that can lead to erroneous measurements of pO2, pCO2, sodium, potassium, and ionized calcium.

Method Description

pO2: Amperometry

pH, pCO2: Potentiometry

Base excess GEM: HCO3- - 24.8 + 16.2 x (pH - 7.4)

HCO3 GEM: Log (HCO₃ (c)) =   pH + log(pCO₂) – 7.608 mmol/L

sO2: Co-oximetry; sO2 = 100 x O2Hb%/(O2Hb% + HHb%)

Performing Lab

Clinical Lab James West Campus
Clinical Lab UH
Respiratory Therapy Doan
Respiratory Therapy East
Respiratory Therapy Martha Morehouse
Respiratory Therapy Outpatient Care East
Respiratory Therapy Outpatient Care New Albany
Respiratory Therapy Outpatient Dublin
Respiratory Therapy UH

Day(s) Performed

Monday through Sunday

Reporting Name

Arterial Blood Gas

CPT Code Information

82803

LOINC Code Information

11558-4
11557-6
11556-8
1959-6
2713-6
11555-0
3150-0