二氧化碳血液测试

定义

CO2 is carbon dioxide. This article discusses the laboratory test to measure the amount of carbon dioxide in the liquid part of your blood, 叫做血清.

In the body, most of the CO2 is in the form of a substance called bicarbonate (HCO3-). Therefore, the 二氧化碳血液测试 is really a measure of your blood bicarbonate level.

选择的名字

Bicarbonate test; HCO3-; Carbon dioxide test; TCO2; Total CO2; CO2 test - serum; Acidosis - CO2; Alkalosis - CO2

How the Test is Performed

A blood sample is needed. 大多数时候， blood is drawn from a vein located on the inside of the elbow or the back of the hand.

How to Prepare for the Test

Many medicines can interfere with blood test results.

• Your health care provider will tell you if you need to stop taking any medicines before you have this test.
• DO NOT stop or change your medicines without talking to your provider first.

How the Test will Feel

You may feel slight pain or a sting when the needle is inserted. You may also feel some throbbing at the site after the blood is drawn.

Why the Test is Performed

The CO2 test is most often done as part of an 电解液 or basic metabolic panel. Changes in your CO2 level may suggest that you are losing or retaining acidic fluid. This may cause an imbalance in your body's 电解液s.

CO2 levels in the blood are affected by kidney and lung function. The kidneys help maintain the normal bicarbonate levels.

正常的结果

The normal range is 23 to 29 milliequivalents per liter (mEq/L) or 23 to 29 millimoles per liter (mmol/L).

Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.

The example above shows the common measurement range of results for these tests. Some laboratories use different measurements or may test different specimens.

What Abnormal Results Mean

Abnormal levels may be due to the following problems:

Lower-than-normal levels:

• 艾迪生疾病
• Carbonic anhydrase inhibitors (used to treat glaucoma)
• 腹泻
• Ethylene glycol poisoning
• 酮症酸中毒
• 肾脏疾病
• 乳酸 酸中毒
• Metabolic 酸中毒
• 甲醇中毒
• Renal tubular 酸中毒 -- distal
• Renal tubular 酸中毒 -- proximal
• Respiratory alkalosis (compensated)
• Salicylate toxicity (such as aspirin overdose)
• Ureteral diversion

Higher-than-normal levels:

• 巴特综合征
• 伯恩斯
• Congestive heart failure
• 库欣综合症
• 脱水
• Excessive sweating
• Hyperaldosteronism
• Metabolic alkalosis
• Respiratory 酸中毒 (compensated)
• Syndrome of inappropriate diuretic hormone secretion (SIADH)
• 呕吐

精神错乱 may also alter bicarbonate levels.

参考文献

邦萨尔一. Respiratory 酸中毒, respiratory alkalosis, and mixed acid-base disorders. In: Johnson RJ, Floege J, Tonelli M, eds. Comprehensive Clinical Nephrology. 7日艾德. Philadelphia, PA: Elsevier; 2024:chap 15.

Seifter杰. Acid-base disorders. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26日艾德. Philadelphia, PA: Elsevier; 2020:chap 110.