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HelpTest Code VBG Venous Blood Gases
Additional Codes
|
Cerner |
NextGen |
|
Blood Gases Venous |
Blood Gases Venous |
Alternate Name(s)
VBG
Blood Gases Venous
Useful For
Blood gas measurements help to evaluate oxygenation and acid base status.
- pH, pCO2, HCO3–, TCO2, Base Excess and Base Deficit, define acid-base status.
- pO2 and O2 Content indicates oxygen.
- CO-oximetry evaluates the ability of the blood to carry oxygen by measuring total hemoglobin and the percentage of functional and dysfunctional hemoglobin species.
- Oxyhemoglobin (O2Hb) [OSAT]: The proportion of Hb that is oxygen-loaded.
Methodology
- Potentiometric
- pH
- pCO2
- Amperometric
- pO2
- Calculated
- HCO3
- Base Excess
- 02 Saturation
Patient Preparation
None
Collection Instructions
Standard phlebotomy practices.
Specimen Requirements
|
Minimum Volume |
150 µL |
|
Container |
Heparinized Syringe free of air bubbles Or Lithium Heparin tube |
|
Stability |
Within 30 minutes of collection |
|
Rejection Criteria |
The Laboratory will not accept specimens in syringes with needles -- the syringe must be capped with a rubber stopper. |
Result Reporting and Reference Values
|
TEST |
UNITS |
AGE |
REFERENCE RANGE |
|||
|
pH VENOUS |
pH units |
0D-150Y |
7.31 |
-- |
7.41 |
|
|
pCO2 VENOUS |
mmHG |
0D-150Y |
40 |
-- |
52 |
|
|
pO2 VENOUS |
mmHG |
0D-150Y |
30 |
-- |
50 |
|
|
HCO3 VENOUS |
mEq/L |
0D-150Y |
22 |
-- |
28 |
|
|
BASE EXCESS VENOUS |
mmol/L |
0D-150Y |
-2 |
-- |
2 |
|
|
O2 SATURATION VENOUS |
% |
0D-150Y |
60 |
-- |
80 |
|
Reflex Testing
None
Limitations
- Air bubbles must be removed from the sample immediately. Contamination with room air will affect results.
- If a patient is on room air and pO2 + pCO2 is greater than 150 mmHg the laboratory will call and recommend the ABG be redrawn due to possible contamination.
- Clotting and dilutional effects may be present if the sample collection technique is not performed correctly.
- The presence of unknown interfering substances, clots or other foreign matter within the blood sample that alters the optical spectrum will result in higher levels of residual spectrum. A sample with an absorbance error will not be reported.
- Anticoagulants such as EDTA, citrate, oxalate, or fluoride will not be accepted since they significantly affect pH and Ionized Calcium.
- The substances listed below showed an interference with CO-Oximetry/tBili analytes causing a clinically significant error (> TEa).