Partial pressure of carbon dioxide (PCO2, PCO2)

Carbon dioxide partial pressure, also known as carbon dioxide tension, refers to the pressure generated by dissolved carbon dioxide in plasma. Since the carbon dioxide molecules have a strong dispersing ability, the blood carbon dioxide partial pressure basically reflects the average value of the alveolar carbon dioxide partial pressure, which represents the respiratory component. Arterial blood is usually drawn and measured with a blood gas analyzer. The partial pressure measurement of carbon dioxide is mainly used to determine whether it is respiratory acidosis or respiratory alkalosis. Basic Information Specialist classification: Respiratory examination classification: blood examination Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: The decrease is mainly seen in alveolar hyperventilation, exhalation of excessive carbon dioxide, such as certain pneumonia, pulmonary infarction, asthma, etc., can produce respiratory alkalosis. Normal value: Male: 4.7-6.4kPa Female: 4.3-6.0kPa Newborn, baby: 3.6-5.5kPa Above normal: Higher than normal causes respiratory acidosis. negative: Positive: Tips: Before taking blood, please explain whether you are taking oxygen. Normal value Male 4.7 ~ 6.4kPa. Female 4.3 ~ 6.0kPa. Newborns, infants 3.6 ~ 5.5kPa. Clinical significance Decreased indicates hyperventilation, clinically less common, mainly seen in alveolar hyperventilation, exhaled excessive carbon dioxide, such as some pneumonia, pulmonary infarction, asthma, etc., can produce respiratory alkalosis. Increased upper airway obstruction, insufficient alveolar ventilation, decreased respiratory function, and accumulation of carbon dioxide in the body, such as chronic bronchitis, emphysema, pulmonary edema, pulmonary heart disease, extensive atelectasis, severe asthma attacks, Chest pleural disease, etc., can cause respiratory acidosis. Low results may be diseases: obstructive sleep apnea, respiratory failure, high respiratory alkalosis may be a disease: distal renal tubular acidosis, amniotic fluid and meconium aspiration syndrome (1) 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. (2) 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. Inspection process Same electrode assay. Not suitable for the crowd Have a coagulopathy such as hemophilia. Adverse reactions and risks Infection: Do not touch the dirt after blood collection. Do not wash your hands immediately to avoid infection.

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