When the pulses can be felt, apply occlusive pressure to both the ulnar and radial arteries to temporarily stop blood circulation of the hand. Place your middle finger on top of the radial pulse and your pointer finger on the ulnar pulse of the patient. Depending on your preference, you can also use your left hand to grab your patient’s right hand. Using your right hand, slowly grab your patient’s left hand. Make sure to locate both the radial and ulnar pulses. The ulnar artery is on the pinky side of the wrist. The radial artery is located on the thumb side of the wrist on the underside of the forearm. Locate the Radial and Ulnar Arteriesįace the patient and locate the radial and ulnar arteries. If the patient cannot do so, you can close their hand manually. Instruct the patient to clench their fist in order to enhance the circulation within the arteries. If a patient’s blood gas values fall outside of the normal ranges, this is when ventilatory and metabolic issues start to arise. Partial Pressure of Carbon Dioxide (PaCO2): 35-45 mmHg.Partial Pressure of Oxygen (PaO2): 75-100 mmHg.This is why you must learn and memorize the following ranges. Learning the normal values is the first important step in mastering ABG interpretation. Oxygen Saturation (SaO2) – refers to the amount of hemoglobin in the blood that is saturated with oxygen.Bicarbonate (HCO3-) – refers to the total amount of CO2 that is transported in the blood.Partial Pressure of Carbon Dioxide (PaCO2) – refers to the amount of carbon dioxide in arterial blood.Partial Pressure of Oxygen (PaO2) – refers to the amount of oxygen in arterial blood.pH – refers to the acid-base balance of the blood.To better understand the key elements of an ABG test, it is important to know the definition of the values being measured.
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