Blood Gases - Greenville Technical College
Blood Gases p.293-298
What Blood Gases Tell us?
Oxygenation (PaO2, PaCO2)
Acid/Base Balance (pH, HCO3)
* pH (7.35-7.45)
* 7=Alkaline
When get Blood Gases back---1st thing look at PaO2 (oxygenation); you want this to between 80-100, if not you need to administer O2. Then once you assess oxygenation, assess acid/base balance.
Correlation between Blood Gases and O2 saturation:
What is normal O2 saturation???
30-60-90 Rule
93%-100% = 80-100mmHg
90% = 60mmHg (Patient Needs __?___)
60% = 30mmHg (Patient Needs __?____)
Acid/Base Balance
pH 7.35-7.45 (normal)
7.45 = ALKALOTIC
You need to know the cause if abnormal pH
PaC02 35-45 (normal)
• CO2 is the RESPIRATORY PARAMETER
• CO2 is carbonic acid so it is acidic
HCO3 (Bicarbonate) 22-28mEq/L (normal)
• Bicarbonate is the METABOLIC PARAMETER (controlled by Kidney)
• Bicarbonate is a base so it is alkaline
Normal Blood Gas Values
PaO2 (80-100)
PaCO2 (35-45)
HCO3 (22-28)
|Acid |Normal |Alkaline |
| | | |
| | | |
pH (7.35-7.45)
PaO2 90mmHg
PaCO2 50
HCO3 24
pH 7.20
PaO2 88mmHg
|Acid |Normal |Alkaline |
| | | |
| | | |
PaCO2 30
HCO3 26
pH 7.60
PaO2 80mmHg
|Acid |Normal |Alkaline |
| | | |
| | | |
PaCO2 37
HCO3 17
pH 7.3
PaO2 75 mmHg
|Acid |Normal |Alkaline |
| | | |
| | | |
PaCO2 40
HCO3 30
pH 7.5
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