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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Lung Disease Week Values at sea level: Apex Altitude Physiology Expeditions. There are two calculations for base excess extra cellular fluid – BE ecf ; blood – BE b.

Interpretation of arterial blood gas

The dilution effect also depends on the hematocrit value. In acidaemia, the bicarbonate levels rise, so that ggasometry can neutralize the excess acid, while the contrary happens when there is alkalaemia.

Selected causes of metabolic alkalosis. How the Test will Feel. Electrolytes bound to heparin cannot be measured by ion-selective electrodes, and the final effect will be measurement offalsely low values. Clinical science Arterial blood gas ABG analysis is a arrterial regularly performed to measure oxygen saturationcarbon dioxideand bicarbonate blood levels.

Arterial blood gas test

Partial pressure of oxygen PaO2: In the patients with metabolic alkalosis, there is an excess of base or a loss of acid which causes the HCO 3 -: Disorders of acid—base balance can lead to severe complications in many disease states, and occasionally the abnormality may be so severe as to become a arterail risk factor.


If an increased anion gap is present, assess the relationship between the increase in the anion gap and the decrease in [HCO 3 -].

The blood can also be drawn from an arterial catheter. Wikipedia articles needing clarification from July The most common problems that are encountered include nonarterial samples, air bubbles in the sample, inadequate or excessive anticoagulant in the sample, and delayed analysis of a noncooled sample.

The hydrogen can be calculated from Table 1. Tell your provider if you are taking any blood-thinning aterial anticoagulantsincluding aspirin.

Dry electrolyte-balanced heparinized syringes evaluated for determining ionized calcium and other electrolytes in whole arterila. Talk to your doctor about the meaning of your specific test results. Arterial carbon dioxide partial pressure P a CO 2. Respiratory muscles—Hypophosphatemia, muscle fatigue, myasthenia gravis, and polymyositis.

Rules for rapid clinical interpretation of ABG When required to make a proper approach towards the evaluation of blood gas and acid—base disturbances in the body, the following scheme is suggested: Most of the patients with metabolic alkalosis can be treated with chloride ions in the form of NaCl saline responsive rather than KCl which is preferable.

Figure 2 shows the alogrithim for approach in a patient with hypoxemic respiratory failure. There are plastic and glass syringes used for blood gas samples. An arterial-blood gas ABG test measures the amounts of artegial gases, such as oxygen and carbon dioxide.


The oxygenation status of the patient is judged by the paO 2 ;however, never comment on the oxygenation status without knowing the corresponding FiO 2.

The usefulness of this diagnostic tool is dependent on being able to correctly interpret the results. During anticoagulation Modern blood gas syringes and capillary tubes are coated with various types of heparin to prevent coagulation in the sampler and inside the blood gas analyzer: The test relies on the fact that oxygenated and deoxygenated hemoglobin absorb different wavelengths of light.

Arterial blood gas analysis and pulse oximetry – Knowledge for medical students and physicians

Such information is vital when caring for patients with critical illnesses or respiratory disease. For more than 40 years, the AG theory gasometrj been used by clinicians to exploit the concept of electroneutrality and has evolved as a major tool for evaluating the acid—base disorder. Disorders that are associated with a low or negative serum AG are listed in Table 2. Secretion clearance Pharmacokinetics Clearance of medications Urine flow rate.

Insufficient gasoketry can cause coagulation of the sample.