What Do the Results Mean?
Modern blood gas analyzers are capable of measuring various forms of hemoglobin, serum electrolytes, and metabolites. Point-of-care blood gas analyzers facilitate analyzing of the blood sample near the bedside and especially in the delivery roomwhich can accelerate clinical decision making versus the hospital central laboratory.
Arterial, venous, and capillary blood gas samples may be analyzed in the NICU, reducing pre- and post-sample collection errors and reducing time to results.
Analyzers come in a variety of sizes from hand-held to portable desktop systems, which are more user friendly, more automated, and require less technical expertise and maintenance by the end user compared with earlier analyzers.
Measuring Principle of a Blood Gas Analyzer Traditional blood gas electrodes for pH, Paco2, and Pao2 measure changes in electrical current or voltage and are linked to a chemical measurement. Today, given the variety of analyzers, many technologies such as potentiometry, amperometry, fluorescence, and ion-selective electrodes are utilized to measure blood gases, electrolytes, and metabolites.
The analyzer will derive or calculate other variables from the pH, Paco2, and Pao2 measured values through algorithms and nomograms. Plasma bicarbonate, or actual bicarbonate, is calculated from the pH and Paco2 measured values. One must keep in mind that derived values are calculated and therefore may not be accurate compared with measured values.
The oxygen saturation of hemoglobin calculation fails to account for dyshemoglobins.
A co-oximeter is preferable in this instance as it can directly measure different hemoglobin species. For this reason, most modern blood gas analyzers also incorporate a co-oximeter. Smaller sample volumes may provide fewer analytes or no co-oximeter values. The validity of blood gas results is dependent on analyzer function, sample collection and sample handling techniques pre- and post-analytical factors.
Blood samples introduced into the analyzer must be collected in an appropriate syringe or capillary tube containing the correct anticoagulant. Blood Gas Analyzer Quality Assurance To ensure consistent reliable results, the blood gas analyzer should be part of a quality assurance program that monitors, documents, and regulates the accuracy of the analyzer.
Internal quality control measures may consist of calibration, quality control and maintenance schedules, comparing samples to lab equipment, and external proficiency testing.
The newest generation of point-of-care analyzers contains disposable sealed packs that include sensors, electrodes, quality control solutions, cleaning solutions, and waste containment. These self-contained packs may decrease the chance of error while handling sensitive electrodes, quality control solutions, and biohazard material.
The analyzers will autocalibrate, analyze quality control samples, and detect errors. Advantages of these systems are less maintenance, better error detection, and consistent quality control.
Traditional analyzers are still in use today and require more maintenance, manual care of electrodes, quality control solutions, and waste management.
A comparison of different analytical methods for measuring oxygen saturation is presented in Table Interpreting an arterial blood gas (ABG) is a crucial skill for physicians, nurses, respiratory therapists, and other health care personnel.
ABG interpretation is especially important in critically ill vetconnexx.com /critical-care/clinical-education/vetconnexx.com · Sampling for arterial blood gas analysis ABS DESCRIPTION: Blood is drawn anaerobically from a peripheral artery (radial, brachial, femoral, or dorsalis pedis) via a single percutaneous needle puncture, or from an indwelling arterial cannula or catheter for multiple vetconnexx.com Assess your knowledge of foundational concepts essential to the nursing management of client health by taking the interactive quiz, located in the media “Arterial Blood Gas vetconnexx.com://vetconnexx.com · Arterial blood gas (ABG) analysis is an essential part of diagnosing and managing a patient’s oxygenation status and acid–base balance.
The usefulness of this diagnostic tool is dependent on being able to correctly interpret the vetconnexx.comon: Rockville Pike, Bethesda, MD. His arterial blood gas (ABG) values are pH = , PaCO2 = 60 mm Hg, PaO2 = 50 mm Hg, HCO3- = 30 mEq/L.
His hematocrit is 52% with normal red cell indices. He is using an inhaled ß2 agonist and Theophylline to manage his respiratory vetconnexx.com://vetconnexx.com · The recent study by Burri and colleagues examined the usefulness of arterial blood gases (ABG) in the diagnosis and prognosis of dyspneic patients with ABG drawn upon presentation to the emergency department .The study was a retrospective analysis of prospectively collected data performed at a single vetconnexx.com://vetconnexx.com