加拿大皇家银行指数

定义

Red blood cell (RBC) indices are part of the 全血计数 (CBC)测试. They are used to help diagnose the cause of 贫血, a condition in which there are too few red blood cells.

这些指数包括：

• Average red blood cell size (MCV)
• 血红蛋白 amount per red blood cell (MCH)
• The amount of hemoglobin relative to the size of the cell (hemoglobin concentration) per red blood cell (MCHC)

选择的名字

Erythrocyte indices; Blood indices; Mean corpuscular hemoglobin (MCH); Mean corpuscular hemoglobin concentration (MCHC); Mean corpuscular volume (MCV); Red blood cell indices

How the Test is Performed

A 血液样本 是必要的.

How to Prepare for the Test

No special preparation is necessary.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. 这很快就会消失.

Why the Test is Performed

血红蛋白 transports oxygen. RBCs carry hemoglobin and oxygen to our body's cells. The 加拿大皇家银行指数 test measures the size and hemoglobin of the RBCs. The results are used to diagnose different types of 贫血.

正常的结果

These test results are in the normal range:

• MCV: 80 to 100 femtoliter
• MCH: 27 to 31 picograms/cell
• MCHC: 32 to 36 grams/deciliter (g/dL) or 320 to 360 grams per liter (g/L)

The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different samples. Talk to your health care provider about the meaning of your specific test results.

What Abnormal Results Mean

These test results indicate the type of 贫血:

• MCV低于正常. Microcytic 贫血 (may be due to low iron levels, lead poisoning, or 地中海贫血).
• MCV正常. Normocytic 贫血 (may be due to sudden blood loss, 长期的疾病, 肾功能衰竭, 再生障碍性贫血, or man-made heart valves).
• MCV高于正常. Macrocytic 贫血 (may be due to low folate or B12 levels, or 化疗).
• MCH低于正常. Hypochromic 贫血 (often due to low iron levels).
• 妇幼保健正常. Normochromic 贫血 (may be due to sudden blood loss, 长期的疾病, 肾功能衰竭, 再生障碍性贫血, or man-made heart valves).
• MCH高于正常. Hyperchromic 贫血 (may be due to low folate or B12 levels, or 化疗).

风险

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Obtaining a 血液样本 from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

• 大出血
• Fainting or feeling lightheaded
• Multiple punctures to locate veins
• Hematoma (blood buildup under the skin)
• Infection (a slight risk any time the skin is broken)

参考文献

Chernecky CC, Berger BJ. 血液指标. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6日艾德. Philadelphia, PA: Elsevier; 2013:217-219.

Elghetany MT, Banki K. 红细胞的障碍. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 33.

意味着RT. Approach to the 贫血s. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26日艾德. Philadelphia, PA: Elsevier; 2020:chap 149.

Vajpayee N, Graham SS, Bem S. Basic examination of blood and bone marrow. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 31.