I am sure we all have learnt about the importance of knowing our Genotypes from the post Genotypes-aa as ac ss-know your compatibility. In this post I will explaining what Rhesus blood group (Rh) means and how it affects mother and her foetus or newborn. I received some questions relating to miscarriages and stillborn and I hope this topic shed some light into why these conditions happens. This topic is kind of complex so what I will do is to define some terms and go straight to the main issue. Kindly ask your questions in the comment box, if you are unclear about anything.
Firstly, in the human system, we have what we call antibodies and antigens. Antibodies are proteins produced by the body that help fight against foreign substances called antigens. Antigens are any substance that stimulates the immune system to produce antibodies. Antigens can be bacteria, viruses, or fungi that cause infection and disease.
Now, when we are asked what our blood group is...our answers are typically "O+ ,O-,A+,A-, B+ or B-, the fact is that these letters (ABO) and symbols (+-) actually represent two different blood group systems in one. Each blood group systems have their different antigens. The (+-) represents the Rhesus(Rh) blood group systems and Rh(D) is the most clinically important antigen. For example, someone who is A+ has the A antigen and the Rh(D) antigen, while someone who is A- lacks the Rh(D) antigen.
The significance of the Rh blood group is related to the fact that the Rh antigens cause very high immune response. This means that a person who does not have the RhD (i.e rhesus negative) will definitely produce an antibody for RhD when in contact with a RhD+ (i.e rhesus positive blood).
How will these bloods come in contact with each other, you would ask... Through blood transfusion and in mothers-to-be.
Now I am landing...Rh incompatibility is a condition that occurs during pregnancy if a woman has Rh-negative blood and her baby has Rh-positive blood. The mother's immune system produces antibodies that react against her baby's blood. The baby's red blood cells break down. The medical word for this process is haemolysis. These antibodies usually don't cause problems during a first pregnancy. This is because the baby is often born before many of the antibodies develop.
However, the antibodies will remain in the body once they have formed. Thus, Rh incompatibility is more likely to cause problems in second or later pregnancies i.e if the baby is Rh-positive. This can lead to serious problems such as brain damage, learning difficulties, deafness, blindness, jaundice and consequently miscarriages or still births.
An Rh-negative woman who conceives a child with an Rh-positive man is at risk for Rh incompatibility. Rh factor is inherited (passed from parents to children through the genes). If you're Rh-negative and the father of your baby is Rh-positive, the baby has a 50 percent or more chance of having Rh-positive blood. Rh incompatibility doesn't cause signs or symptoms in a pregnant woman.
Treatments are available. In mild cases, no treatment may be needed. If treatment is needed, the baby may be given a medicine called erythropoietin and iron supplements.
If the hemolytic anemia is severe, the baby may get a blood transfusion through the umbilical cord. If the hemolytic anemia is severe and the baby is almost full-term, your doctor may induce labor early.
Rhesus disease is uncommon these days because it can usually be prevented using injections of a medication called anti-D immunoglobulin.
All women are offered blood tests as part of their antenatal screening to determine whether their blood is RhD negative or positive. If the mother is RhD negative, she'll be offered injections of anti-D immunoglobulin at certain points in her pregnancy when she may be exposed to the baby's red blood cells.
So in a nutshell, knowing your Rhesus compatibility status is as important as knowing your Genotype compatibility status to prevent any future complications.
Pharm G B. IDAMKUE
Reference:
1. link accessed on the 26th of July, 2018
2.link accessed on the 26th of July, 2018
4. link accessed on the 28th of July, 2018
5. link accessed on the 28th of July, 2018







