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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