Fetal-maternal erythrocyte distribution blood test

定义

The fetal-maternal erythrocyte distribution test is used to measure the number of the unborn baby's red blood cells in a pregnant woman's blood.

选择的名字

Kleihauer-Betke stain; Flow cytometry - fetal-maternal erythrocyte distribution; Rh不相容 - erythrocyte distribution

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 for this test.

考试的感觉如何

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

Rh不相容 is a condition that occurs when the mother's blood type is Rh-negative (Rh-) and her unborn baby's blood type is Rh-positive (Rh+). 如果母体是Rh+, or if both parents are Rh-, there is no reason to worry about Rh不相容.

If the baby's blood is Rh+ and gets into the mother's Rh- bloodstream, her body will produce antibodies. These antibodies could pass back through the placenta and harm the developing baby's red blood cells. This can cause mild to serious 贫血 在未出生的婴儿身上.

This test determines the amount of blood that has been exchanged between the mother and fetus. All Rh- pregnant women should get this test if they have bleeding or a risk of bleeding during the pregnancy.

In a woman whose blood is Rh incompatible with her infant, this test helps find out how much Rh immune globulin (RhoGAM) she must receive to prevent her body from producing abnormal proteins that attack the unborn baby in future pregnancies.

正常的结果

In a normal value, no or few of the baby's cells are in the mother's blood. The standard dose of Rh immune globulin is enough in this case.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

In an abnormal test result, blood from the unborn baby is leaking into the mother's blood circulation. The more of the baby's cells there are, the more Rh immune globulin the mother must receive.

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. Taking blood 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
• Multiple punctures to locate veins
• Fainting or feeling lightheaded
• 血肿 (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)

参考文献

陈国强，张国强. Betke-Kleihauer stain (fetal hemoglobin stain, Kleihauer-Betke stain, K-B) - diagnostic. In: 陈国强，张国强, eds. Laboratory Tests and Diagnostic Procedures. 6日艾德. St Louis, MO: Elsevier Saunders; 2013:193-194.

降温L，降温T. 免疫血液学. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 36.

莫伊兹KJ. Red cell alloimmunization. In: Landon MB, Galan HL, Jauniaux ERM, et al, eds. Gabbe's Obstetrics: Normal and Problem Pregnancies. 8日艾德. Philadelphia, PA: Elsevier; 2021:chap 40.