I have Rh-blood type, why is it dangerous for the fetus?

Most of us know common blood types including A, B, AB, O. In each blood type there is a plus-minus blood type system. Each person at birth has inherited genetics from parents, so there is one of the eight blood groups mentioned above and does not change throughout life.

1. I have Rh-blood type, why is it dangerous for the fetus?

The plus sign of each blood type in turns out that the person's bloth surface has rh antigen, fully written as Rh(D)+ in the first case or without rh antigen, written in full as Rh(D)- in the second case.

In Vietnam, up to 99.96% of people belong to Rh+ blood type (either O+ or B+ or A+ or AB+, according to the decreasing rate) but only 0.04%-0.07% of people belong to blood type Rh- (either O- or B- or A- or AB-). Blood type with a rate of less than 0.1% is a rare blood type and less than 0.01% is a very rare blood type. People with rh-rare blood type in our country belong to the community of people with rare blood groups, statistics show that in 10000 people only 4-7 people have Rh-blood type.

Belonging to a rare blood type causes one person to face a much higher risk than others for some of the following reasons:

  • When urgent blood transfusions are required in cases of accidents, emergency surgery … this blood type is not always available for transmission in hospitals and medical facilities.
  • In case you have Rh-blood type, you have Rh+ blood type, according to genetic rules, at least 50% of babies born will have Rh+ blood type like dad. At the first pregnancy, the rh+ blood type of rh+ like dad develops normally until birth if the process of pregnancy is not hurt. However, at the second pregnancy, if the child still has rh+ blood type, there will often be a blood type disagreement with the mother's blood type rh-. The mother's body makes antibodies that pass through each other against rh+ antigens in the blood type of the child causing red blood cells, also known as hem soluble. The consequences can cause miscarriage, still still life, premature birth, babies born with intellectual disability, hem soluble, frequent blood changes …
  • For women with Rh- blood type during pregnancy with Rh+ blood type, there may be a blood transfusion accident at the first Rh+ blood transfusion.

What is Blood Type Rh-

This Blood Type Rh- is not always available for transmission in hospitals and medical facilities

It can be said more about the case of the person carrying the blood type Rh- that is, the body does not have antigens of the blood type Rh, so it is impossible to fight the antigen of the Rh group. The body may be hypersensitive to this blood type. The obvious specific manifestation in the pregnant mother who received a blood transfusion will give birth to antibodies against Rh+. From the second blood transfusion with the Rh+ group, in the human body there will be a reaction between antibodies and Rh antigens and cause hemoma.'

In a more understandable way, the mother has a blood type Rh- has never received a blood transfusion, during pregnancy, often has the same blood type as rh+, the red blood cells of the child carrying the blood type Rh+ penetrate into the mother's blood type, stimulating the mother's body to give birth to anti-Rh+ antibodies. During the 2nd pregnancy, this antibody can be transmitted into the fetus, against the baby's red blood cells, causing accidents such as fetal edema, hemoma in babies.

2. How to prevent danger to the fetus due to RH- blood type?


Need to know what blood type you carry, if you belong to rare blood groups, you need to be psychologically ready to prepare the worst case when you need a blood transfusion

The seriousness of the disagreement between the Rh+ and Rh- group obliges us to understand and take measures to prevent and minimize the risk of danger to the fetus during pregnancy. It is necessary to know what blood type you carry, if you belong to rare blood groups, you need to be psychologically ready to prepare the worst case when you need a blood transfusion. Especially for women with Rh blood type, pregnancy monitoring should be managed closely and properly. Pregnant mothers with Rh-blood type need anti-D prevention if the husband has RH+ blood type. Use of immunosymed antibodies D should be carried out under the advice of a doctor:

Monitoring fetal anemia and the effectiveness of anti-D immuno antibodies every 2 weeks for obstetrics and gynecology; negative anti-D immunos antibody values, periodically prevent it with anti-D.

The use of anti-D is as follows: During pregnancy: there are 2 uses and the same effect;

  • Method 1: 2 doses of anti-D IgG 500 IU – 625 IU at the 28th and 34th weeks of pregnancy (If an anti-D injection is given at week 28, week 34 can always be injected with anti-D without re-testing the price of immunosed antibodies).
  • Option 2: inject 1 single dose of anti-D IgG 1500 IU at the 28th week of pregnancy.

In addition, post-birth prevention is also required, anti-D IgG 500IU – 1500 IU injection within 72 hours after birth (if the child is bornwith a positive Rh(D) blood type).

By having rh blood type on the pregnant mother, it will minimize the risk of danger to the fetus, ensuring the safety and development of the fetus.

At Share99 International Health Hub, there is a full maternity service as a solution to help pregnant mothers feel secure because there is a team of doctors throughout the pregnancy. When choosing a full-service maternity, a pregnant woman can:

  • The process of pregnancy is monitored by a team of specialists
  • Regular examination, early detection of abnormalities
  • Package maternity for the convenience of childbirth
  • Babies receive comprehensive care.

For direct advice, please click hotline number or register online HERE. In addition, you can register for remote consultation HERE


  • What do you know about the rarest blood types?
  • How to categorise blood type
  • What happens if there is a blood type disagreement between mother and child?

About: John Smith

b1ffdb54307529964874ff53a5c5de33?s=90&r=gI am the author of Share99.net. I had been working in Vinmec International General Hospital for over 10 years. I dedicate my passion on every post in this site.


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