The PaO2 measurement shows the oxygen pressure in the blood. Most healthy adults have a PaO2 within the normal range of
80–100 mmHg
. If a PaO2 level is lower than 80 mmHg, it means that a person is not getting enough oxygen .
What is a normal pO2 on an ABG?
| pH 7.31–7.41 | pCO2 41–51 torr 5.5–6.8 kPa | pO2 30–40 torr 4.0–5.3 kPa | CO2 23–30 mmol/L | Base excess/deficit ± 3 mEq/L ± 2 mmol/L |
|---|
What is the normal range for PaO2?
Partial pressure of oxygen (PaO2):
75 to 100 millimeters of mercury (mm Hg)
, or 10.5 to 13.5 kilopascal (kPa) Partial pressure of carbon dioxide (PaCO2): 38 to 42 mm Hg (5.1 to 5.6 kPa)
What should PaO2 be at?
When the body is functioning normally, PaO2 is
between 75 and 100 mmHg
(at sea level). 5 A result in this range means a sufficient amount of oxygen flowing from the alveoli to the blood.
What is normal range of pO2 and PCO2?
The partial pressure of carbon dioxide (PCO2) is the measure of carbon dioxide within arterial or venous blood. It often serves as a marker of sufficient alveolar ventilation within the lungs. Generally, under normal physiologic conditions, the value of PCO2 ranges
between 35 to 45 mmHg
, or 4.7 to 6.0 kPa.
What is a normal FIO2 level?
Natural air includes 21% oxygen, which is equivalent to F
I
O
2
of 0.21. Oxygen-enriched air has a higher F
I
O
2
than 0.21; up to 1.00 which means 100% oxygen. F
I
O
2
is typically maintained
below 0.5
even with mechanical ventilation, to avoid oxygen toxicity, but there are applications when up to 100% is routinely used.
What does pO2 measure?
pO2: This is measured by a pO2 electrode. It is
the partial pressure (tension) of oxygen in a gas phase in equilibrium with blood
. High or low values indicate blood hyperoxia or hypoxia, respectively. pO2 in venous blood is lower than arterial blood due to oxygen extraction by peripheral tissues.
What is normal ABG level?
An acceptable normal range of ABG values of ABG components are the following,[6][7] noting that the range of normal values may vary among laboratories and in different age groups from neonates to geriatrics:
pH (7.35-7.45) PaO2 (75-100 mmHg) PaCO2 (35-45 mmHg)
Is PO2 and PaO2 the same thing?
1. PO2 , SaO2 ,
CaO2 are all related but different
. … If the lungs are normal, then PaO2 is affected only by the alveolar PO2 (PAO2), which is determined by the fraction of inspired oxygen, the barometric pressure and the PaCO2 (i.e., the alveolar gas equation).
How do you interpret ABG results?
If the ABG results reveal pH numbers are not within the normal range, the patient’s pH level is either acidotic or alkalotic. The lower the number, the more acidotic the patient is. For instance, a pH of 3 is severely acidotic and requires emergency intervention. Alkalosis is the opposite.
What is a good PaO2?
Since a normal PaO2 is
between 90-100 mmHg
, some people may think that an O2 saturation of 90 is normal as well — after all 90 was a pretty good grade to get in school. … An O2 sat of 90% corresponds to a PaO2 of 60 mmHg. This is the minimum oxygen concentration providing enough oxygen to prevent ischemia in tissues.
What does PaO2 of 60 mean?
Assessing blood oxygenation
The normal PaO2 at sea level ranges between 80 and 110 mm Hg. Hypoxemia is usually defined as a PaO2 < 80 mm Hg. A PaO2 of less than 60 mm Hg
marks severe hypoxemia and treatment
should be implemented.
What does PaO2 mean?
Partial pressure of oxygen
(PaO2). This measures the pressure of oxygen dissolved in the blood and how well oxygen is able to move from the airspace of the lungs into the blood. Partial pressure of carbon dioxide (PaCO2).
How is pO2 calculated?
The P/F ratio equals the arterial pO2
(“P”) from the ABG divided by the FIO2 (“F”)
– the fraction (percent) of inspired oxygen that the patient is receiving expressed as a decimal (40% oxygen = FIO2 of 0.40).
Can PAO2 be greater than 100 on room air?
At steady state,2 in a normal individual breathing room air, PIO2 is 149 mmHg, and if PACO2 is 40 mmHg, PAO2 can be as high as 109 mmHg. However, in the normal resting state, the measured PAO2 (from end-expiratory air) is 100
mmHg when PACO2 is 40
mmHg. Therefore, there must be other factors that affect PAO2.
What causes high PCO2 levels?
The most common cause of increased PCO2 is
an absolute decrease in ventilation
. Increased CO2 production without increased ventilation, such as a patient with sepsis, can also cause respiratory acidosis. Patients who have increased physiological dead space (eg, emphysema) will have decreased effective ventilation.
