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HelpTest Code CBG Capillary Blood Gases
Additional Codes
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Cerner |
NextGen |
|
Blood Gases Capillary |
Blood Gases Capillary |
Alternate Name(s)
CBG
Blood Gases Capillary
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 |
65 µL |
|
Container |
Heparinized Capillary tube free of air bubbles. |
|
Stability |
Within 10 minutes of collection |
|
Rejection Criteria |
Not Defined |
Result Reporting and Reference Values
|
TEST |
UNITS |
SEX |
AGE |
REFERENCE RANGE |
CRITICAL VALUES |
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Low |
High |
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pH CAPILLARY |
pH units |
All |
0D-2D |
7.33 |
-- |
7.49 |
<7.2 |
>7.57 |
|
2D-30D |
7.32 |
-- |
7.43 |
<7.2 |
>7.57 |
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30D-60D |
7.34 |
-- |
7.43 |
<7.2 |
>7.57 |
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|
60D-150Y |
7.34 |
-- |
7.46 |
<7.2 |
>7.57 |
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|
pCO2 CAPILLARY |
mmHG |
All |
0D-60D |
27 |
-- |
40 |
N/A |
|
|
60D-2Y |
26 |
-- |
41 |
N/A |
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2Y-18Y |
36 |
-- |
40 |
N/A |
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|
18Y-150Y |
26 |
-- |
41 |
N/A |
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|
pO2 CAPILLARY |
mmHG |
All |
0D-3D |
54 |
-- |
95 |
<40 |
>200 |
|
3D- 150Y |
57 |
-- |
94 |
<40 |
>200 |
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HCO3 CAPILLARY |
mEq/L |
F |
0D-30D |
17 |
-- |
24 |
N/A |
|
|
30D-60D |
19 |
-- |
24 |
N/A |
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|
60D-2Y |
16 |
-- |
24 |
N/A |
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|
2Y-16Y |
21 |
-- |
27 |
N/A |
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|
16Y-150Y |
18 |
-- |
28 |
N/A |
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|
M |
0D-30D |
17 |
-- |
24 |
N/A |
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|
30D-60D |
19 |
-- |
24 |
N/A |
||||
|
60D-2Y |
16 |
-- |
24 |
N/A |
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|
2Y-16Y |
21 |
-- |
27 |
N/A |
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|
16Y-150Y |
21 |
-- |
28 |
N/A |
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|
BASE EXCESS CAP |
mmol/L |
All |
0D-30D |
-10 |
-- |
2 |
N/A |
|
|
30D-2Y |
-7 |
-- |
2 |
N/A |
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|
2Y-10Y |
-2.3 |
-- |
2 |
N/A |
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|
10Y-150Y |
-2 |
-- |
2 |
N/A |
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O2 SATURATION CAP |
% |
All |
0D-150Y |
90 |
-- |
98 |
N/A |
|
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).