The alveolar-arterial oxygen partial pressure difference is a difference between the alveolar oxygen partial pressure and the arterial oxygen partial pressure, which is a basis for judging whether the lung ventilation function is normal or not. In heart and lung resuscitation, the alveolar-arterial oxygen pressure difference is an important indicator of prognosis. Arterial blood was drawn and measured with a blood gas analyzer. It is used to judge the ventilation function of the lungs, and it can reflect the oxygen uptake of the lungs more sensitively than PaO2. Helps to understand the progress of lung lesions. Can be used as a reference indicator for mechanical ventilation or for weaning.

Basic Information

Specialist classification: Respiratory examination classification: pulmonary function test

Applicable gender: whether men and women apply fasting: fasting

Tips: Not suitable for the crowd: taking sodium bicarbonate, etalic acid, sodium glutamate, phenylbutazone, aspirin and other drugs. Normal value

Less than 2.66 kPa.

Clinical significance

Abnormal results:

Reduce high altitude hypoxemia.

A significant increase in elevation is seen in atelectasis and adult respiratory distress syndrome; moderate increases are seen in chronic obstructive pulmonary disease; mild increases may be due to insufficient alveolar ventilation, such as asthma and pneumonia.

People who need to check:

In patients with pulmonary ventilation dysfunction, patients with lung disease determine the progress of the disease.

Low results may be diseases: high altitude sickness may cause diseases: obstructive emphysema, desquamative interstitial pneumonia, emphysema, emphysema in the elderly, acute respiratory distress syndrome in the elderly, adult respiratory distress syndrome , acute respiratory distress syndrome precautions

Requirements for inspection:

Before the blood is drawn, it is necessary to indicate whether or not to take oxygen. The blood sample should be isolated from the outside air and sent to the test in time. Arterial blood gas analysis of blood collection sites, generally the radial artery, radial artery, femoral artery and so on. If venous blood is required, the forearm should be placed in warm water at 45 ° C for 20 min to make the venous blood arterial. It is not advisable to use a tourniquet when drawing blood.

Preparation before inspection:

(1) The use of certain drugs can increase or decrease the pH of the blood, such as the use of sodium bicarbonate, ethenic acid, sodium glutamate, phenylbutazone, aspirin, etc. to increase blood pH; use tetracycline, isoniazid Bismuth, phenformin, ammonium chloride can reduce blood pH. So please let the doctor know before the test.

(2) Fasting.

Not suitable for people:

Patients taking drugs such as sodium bicarbonate, etalic acid, sodium glutamate, phenylbutazone, and aspirin.

Inspection process

Arterial blood was drawn using a clean tube, sent for testing, and measured with a blood gas analyzer.

Not suitable for the crowd

Contrained people: patients taking sodium bicarbonate, etalic acid, sodium glutamate, phenylbutazone, aspirin and other drugs.

Adverse reactions and risks

No complications or harm.