An arterial-blood gas (ABG) test measures the amounts of arterial gases, such as oxygen and carbon dioxide. An ABG test requires that a small volume of blood. An arterial blood gas test can find ways to help your lungs do their job. Find out when you get it and what the results mean. Blood gases are a measurement of how much oxygen and carbon dioxide are in your blood. They also determine the acidity (pH) of your blood.

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Blood gases

The blood can also be drawn from an arterial catheter. This page was last edited on 16 Octoberat For samples with high pa O 2 e. This means that the AG is increased. Respiratory physiology Blood tests Respiratory therapy. Contamination of the sample with room air will result in abnormally low carbon dioxide and possibly elevated oxygen levels, and a concurrent elevation in pH.

Selected mixed and complex acid-base disturbances. Mixed metabolic disturbances e. Carbon dioxide is dissolved in the blood as carbonic acid, a weak acid; however, in large concentrations, it can affect the pH drastically. This is familiarly known as anion gap AGwhen normal concentration is actually caused by A.


The hydrogen can be calculated from Table 1.

Disorders that are associated with a low or negative serum AG are listed in Table 2. Prepare and succeed on your medical exams.

Interpretation of arterial blood gas

Breathing Problems Read more. Privacy Statement Term of Use. Gaosmetry Blood Gas Monitoring: Based on the expected paO 2 classify as mild, moderate, and severe hypoxia. There are plastic and glass syringes used for blood gas samples. The utilization of an ABG arteriao becomes necessary in view of the following advantages:. Definition Mixed oxygen venous saturation S v O 2 is the saturation of hemoglobin in the pulmonary artery. Views Read Edit View history.

This prevents stacking such as coins or plates of red blood cells. An arterial-blood gas ABG test measures the amounts of arterial gases, such as oxygen and carbon dioxide. Respiratory acidosis would occur in COPD, muscular weakness, postoperative cases, and opioid overdose, and respiratory alkalosis is likely to occur in sepsis, hepatic coma, and pregnancy.

Physiology of the kidneys and acid-base physiology. The kidney and the liver are two main organs responsible for the metabolic homeostasis of gaasometry. Description of the species of unmeasured anions, source of gasometrry, and diagnostic adjuncts in case of high anion gap metabolic acidosis.

According to the principle of electrical neutrality, this difference is balanced by the weak acids and CO 2. Spr Ber Heid Publ.


A modified Allen test must be performed before the radial artery is punctured to assess collateral circulation in the hand. Once the sample is obtained, care is taken to eliminate visible gas bubbles, as these bubbles can dissolve into the sample and cause inaccurate aeterial.

Arterial oxygen partial pressure P a O 2.

Arterial blood gas test

Please review our privacy policy. Accurate results for an ABG depend on the proper manner of collecting, handling, and analyzing the specimen.

Potential Preanalytical Errors Preanalytical errors are caused at the following stages: What is the relationship between the direction of change in the artwrial and the direction of change in the PaCO 2?

However, this mechanism is slower than the respiratory pathway and may take from a few hours to 3 days to take effect. This leads to a rise of carbonic acid, leading to a decrease in pH.

Clinical and Laboratory Standards Institute. Hyperinflation therapy Pulmonary hygiene Mechanical ventilation Oxygen therapy.