Patient's question:
Ask the doctor, is blood type related to pregnancy? I am type A blood, my husband is type O, will it affect fertility?Doctor's answer:
Hao Hao, hello! First of all, I wish you the best of luck in getting pregnant with a healthy baby soon! Below, I will discuss the topic of "Blood Type and Fertility." The relationship between blood type and a child's health is a concern that many couples often have. If the mother and child have incompatible blood types, the antibodies in the mother's body can enter the baby's body through the placenta, potentially causing neonatal hemolytic disease. It is reported that in all deliveries, there is approximately a 20-30% chance of maternal and child blood type incompatibility, meaning that children born to these mothers may develop neonatal hemolytic disease. In contrast, less than 10% of parents undergo prenatal blood serology tests at the hospital. Neonatal hemolytic disease is caused by blood type incompatibility between couples, and since blood type incompatibility is quite common, neonatal hemolytic disease is also prevalent. Although the incidence rate of neonatal hemolytic disease accounts for about 10% of maternal and child blood type incompatibility, the potential consequences can be quite severe. Hemolytic babies are prone to anemia and jaundice. The symptoms of hemolytic disease can range from mild to severe. Under normal circumstances, children will develop a certain degree of jaundice starting from the second day after birth. The mother will notice a lemon-yellow hue on the baby's face, head, chest, or abdomen. By the fourth to sixth day, the jaundice will become more pronounced, reaching a small peak. Around the tenth day after birth, the yellow color will gradually fade, returning to normal. This is because the antibodies from the mother's blood are consumed daily in the infant's body, so the symptoms will gradually improve. If jaundice appears within the first 24 hours after birth, progresses rapidly, and even spreads to the entire body, changing from light yellow to golden yellow or orange, it should be a cause for concern. When hemolysis is severe, the child may develop anemia, or even "kernicterus," also known as bilirubin encephalopathy. This occurs when bilirubin, a substance produced after red blood cells are destroyed, enters the brain, leading to sequelae such as limb disabilities, vision impairment, deafness, poor tooth development, intellectual disability, and epilepsy. This is the most severe consequence. During hemolysis, in addition to jaundice, anemia and liver/spleen enlargement may also occur. If not treated promptly, it can affect the child's healthy development. However, in most cases, ABO blood type hemolysis symptoms are mild, and most children do not require special treatment after birth. Timely blue light therapy and medication can alleviate the condition. Even with severe Rh hemolytic disease, if blood transfusion is performed promptly, the vast majority of babies can recover. Additionally, jaundice in a baby does not necessarily indicate hemolytic disease. Approximately 80% of newborns may develop jaundice, but only a small portion of this is caused by hemolysis. Similarly, a hemolytic baby may not necessarily exhibit the aforementioned symptoms, as some children may not discover their blood type difference from their parents until they are adults. Infants born to O-type mothers and AB-type fathers are most prone to this condition. According to reports, the causes of neonatal hemolytic disease are mainly divided into two types: ABO blood type incompatibility and Rh blood type incompatibility. In China, the most common cause is ABO blood type incompatibility, especially when the mother is O-type and the father is AB-type. This is because children born to these parents will have either A or B blood type, making them more susceptible to hemolytic disease. Although the fetus relies on the mother for nutrition within the womb, there is a "placental barrier" between the mother and fetus, which prevents the blood of the two from "mixing." However, a small number of fetal red blood cells may still the mother's circulation, leading to the production of antibodies. A small amount of the mother's blood may also enter the fetus's body. Generally, the mother is not affected by hemolysis, but the two different blood types in the child's body may "clash," causing hemolytic disease. Of course, not all children with blood type incompatibility between mother and child will experience this "clash." After birth, the antibodies from the mother's blood in the infant's body will be metabolized and depleted within a certain period, allowing the child to recover quickly. Therefore, O-type expectant mothers can still become pregnant and give birth. However, some severe forms of hemolysis may lead to miscarriage or stillbirth. If young couples experience repeated miscarriages or stillbirths for no apparent reason, they should consider the possibility of hemolysis being the underlying cause. The other type of hemolytic disease occurs when there is Rh blood type incompatibility between the mother and child, and this condition is less common in the Han Chinese population. It is important to pay attention to both prenatal and postnatal care. If the expectant father is A-type, B-type, or AB-type blood, and the expectant mother is O-type with a history of miscarriage or blood transfusion, it is important to monitor the newborn for anemia and jaundice, ensuring that it is not confused with jaundice or anemia caused by other reasons, to avoid delaying treatment. If there is a possibility of ABO blood type incompatibility, the expectant mother should undergo a "prenatal blood serology test" before pregnancy to check the status of antibodies in the blood. If the antibodies have low "activity," the expectant parents can feel at ease about having a child. If the antibodies have high "activity," some medications can be used to reduce them. Many hospitals in Hangzhou now offer corresponding herbal treatments for this purpose. The main goal of this approach is to reduce the "harmful effect" of the mother's antibodies. If the expectant mother is already pregnant, she should remember to start regular blood tests from around the 16th week of pregnancy, usually once every four weeks, to closely monitor the possibility of hemolysis in the baby. If any abnormalities are detected, treatment during pregnancy can be effective. For expectant parents with different Rh blood types, the first pregnancy is usually not a problem. However, if there has been a history of miscarriage or childbirth, it is essential to check the mother's Rh antibodies. If the antibodies are positive with high "activity," pregnancy should be avoided, as the risk of stillbirth or severe neonatal hemolytic disease would be significantly higher. Source: (China Family Planning Association) If you find this answer helpful, please do not disappoint me with my good intentions and click "Accept as Answer" promptly.