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.
"VSports app下载" How the Test is Performed
A blood sample is needed.
How to Prepare for the Test
No special preparation is necessary for this test.
V体育安卓版 - 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. This soon goes away V体育ios版.
VSports app下载 - Why the Test is Performed
Rh incompatibility 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+). If the mother is Rh+, or if both parents are Rh-, there is no reason to worry about Rh incompatibility VSports最新版本.
If the baby's blood is Rh+ and gets into the mother's Rh- bloodstream, her body will produce antibodies V体育平台登录. These antibodies could pass back through the placenta and harm the developing baby's red blood cells. This can cause mild to serious anemia in the unborn baby.
This test determines the amount of blood that has been exchanged between the mother and fetus VSports注册入口. 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.
Normal Results
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 VSports在线直播.
Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results V体育2025版.
What Abnormal Results Mean (VSports最新版本)
An abnormal test result means that blood from the unborn baby is leaking into the mother's blood circulation VSports. The more of the baby's cells there are, the more Rh immune globulin the mother must receive.
Risks (V体育官网入口)
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 VSports app下载.
Other risks associated with having blood drawn are slight, but may include:
- Excessive bleeding
- Multiple punctures to locate veins
- Fainting or feeling lightheaded
- "V体育2025版" Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
Alternative Names
Kleihauer-Betke stain; Flow cytometry - fetal-maternal erythrocyte distribution; Rh incompatibility - erythrocyte distribution
VSports - References
Cooling L, Downs T. Immunohematology. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 36.
Moise KJ. Red cell alloimmunization. In: Landon MB, Galan HL, Jauniaux ERM, et al, eds. Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th ed. Philadelphia, PA: Elsevier; 2021:chap 40.
VSports - Review Date 7/31/2024
Updated by: Charles I. Schwartz, MD, FAAP, Clinical Assistant Professor of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, General Pediatrician at PennCare for Kids, Phoenixville, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.