If you are a mother-to-be, or if you are already expecting a baby, you have probably heard about the many blood tests that your doctor will perform at your first check-up. One of the most important of these is a check for the Rh factor. This may seem a little confusing and new to you. But don't worry , today we will talk about what the Rh factor is and how it is important for you and your baby in a very simple and understandable way.
What is Rh factor? Let's understand it simply!
Simply put, the Rh factor is a special protein on the surface of your red blood cells. It's something you inherit from your parents, just like your height or skin color.
- If you have this protein in your red blood cells, you are Rh-positive .
- If you don't have this protein in your red blood cells, you are Rh-negative .
Think about it, most of the people in the world, about 85 percent (85%) of them, are Rh-positive . So if you are Rh-positive, that's the normal situation.
We all know about our blood types. There are three main blood types: A, B, AB, and O. These blood types are either "positive (+)" or "negative (-)" depending on your Rh factor. For example, if your blood type is A and your Rh factor is positive, your blood type is "A positive." And so on:
- A Negative
- B Positive
- B Negative
- O Positive
- O Negative
- AB Positive
- AB Negative
The important thing is that your Rh factor does not affect your general health or cause any problems. It is simply a characteristic of your blood.
Why is the Rh factor important during pregnancy?
Even though your Rh factor has no impact on your normal life, you should be concerned about this if you are pregnant, especially if you are Rh-negative .
Here's what happens:
Imagine, you are an Rh-negative mother (meaning you don't have that special protein in your blood). However, if the baby in the womb is Rh-positive (meaning the baby has that protein in their blood, inherited from the father), then a small problem can arise. We call this Rh incompatibility .
At this time, the mother's immune system may recognize the baby's Rh-positive red blood cells as "foreign." Just as our immune system fights off a germ when it enters our body, the mother's body begins to make antibodies against the baby's red blood cells. This process is called Rh sensitization .
But don't worry! Modern medicine has good treatments to prevent this condition. Your doctor can give you a vaccine called ``immune globulin'' to stop this problem from happening.
How can the blood of the mother and the baby mix?
Normally, the blood of the mother and the baby in the womb do not mix directly during pregnancy. However, in some special cases, a very small amount of the baby's blood can mix with the mother's blood. Such cases include:
- During childbirth: It can be a vaginal delivery or a cesarean section.
- Some special tests performed during pregnancy: for example, tests such as ``amniocentesis`` (examination of amniotic fluid) or ``chorionic villus sampling - CVS`` (examination of part of the placenta).
- If you experience vaginal bleeding during pregnancy.
- If there is a serious accident or injury to the stomach.
- In the event of a complication in early pregnancy, such as a miscarriage or an ectopic pregnancy.
- After a procedure called ``external cephalic version (ECV)'', which is used to turn a baby who is breech.
When is the baby at risk?
Usually, the baby does not have any major problems during the first pregnancy of an Rh-negative mother. The reason for this is that the mother's blood is most likely to mix with the baby's blood during childbirth. So, even if those antibodies start to form, the baby will already be born by that time. However, your doctor will test the Rh factor even if it is your first pregnancy.
The problem can arise if you get pregnant for the second time and the baby is also Rh-positive. This is because you may still have antibodies that you made after having your first baby. Then, those antibodies can cross the placenta and start attacking the Rh-positive red blood cells of the second baby. This condition is called Rh disease . This can be very dangerous for the baby, even life-threatening .
Who is at risk of Rh incompatibility?
This risk occurs when an Rh-negative mother carries an Rh-positive baby . The baby's Rh factor is determined by the genes inherited from the mother and father.
- If the mother is Rh-negative (-) and the father is Rh-positive (+):
- The baby may also be Rh-positive (+) (then there is a risk of incompatibility).
- The baby could also be Rh-negative (-) (in which case there is no risk).
- If the mother is Rh-negative (-) and the father is also Rh-negative (-):
- The baby will always be Rh-negative (-). So there is no risk.
- If the mother is Rh-positive (+):
- Whether the father is Rh-positive (+) or Rh-negative (-), the baby will not experience any incompatibility due to the mother's Rh factor, because the mother's body does not produce antibodies against that "foreign" protein.
How to know the Rh factor? (Rh factor test)
This is very simple. When you get pregnant, you can find out what your Rh factor is with a simple blood test (type and screen) at your first prenatal appointment. This is very important. Because if you are Rh-negative and the baby is Rh-positive, that Rh factor incompatibility we talked about can occur.
How is Rh incompatibility diagnosed and treated?
When you become pregnant, your obstetrician will first check to see if you are Rh-negative.
- If you are Rh-positive: No problem. There is nothing else to do.
- If you are Rh-negative and your antibody screen is negative: Your doctor will give you a shot of Rh immune globulin (also called RhoGAM®) . This is given to prevent the formation of those antibodies.
- This vaccine is usually given once , around the 28th week of pregnancy.
- Another dose is given within 72 hours of the baby's birth (only if the baby is Rh-positive).
- Sometimes, even early in pregnancy (for example, if you have bleeding), if the doctor thinks that your blood and that of your baby may be mixed, this vaccine may be given.
This `(RhoGAM®)` vaccine works like a protective shield . It stops your body from producing those dangerous antibodies. This vaccine is very effective in treating Rh incompatibility. Therefore, detecting this condition early in pregnancy is the best way to prevent serious complications.
However, if you have already developed Rh antibodies (antibody screen positive), the RhoGAM® vaccine will not help. In that case, doctors will closely monitor you and your baby throughout your pregnancy. Depending on the baby's condition, doctors may decide to deliver the baby early.
What complications can occur due to Rh incompatibility?
Rh incompatibility does not affect the pregnant mother . However, it can affect the baby in the womb. The main one is a condition called hemolytic anemia . Simply put, the baby's red blood cells are destroyed faster than they are replaced.
The effects can range from mild to very serious. They include:
- Jaundice: Yellowing of the skin and eyes.
- Liver failure .
- Heart failure .
- Stillbirth .
However, most of the time, babies with mild effects of Rh disease do not need special treatment . Such babies recover completely.
In severe cases, the baby may need a blood transfusion . This means giving the baby new blood. Babies with jaundice may be put under special light therapy (phototherapy) to reduce the level of bilirubin, which causes the yellow color. To prevent severe anemia, the baby may need to be delivered a little early.
The good news is that since the discovery of the Rh immune globulin vaccine, the incidence of Rh disease has decreased significantly.
What happens if the antibodies run out?
If an Rh-negative mother's body has run out of antibodies, treatment with the `(Rh immune globulin)` vaccine will not work. That's why we say it's important to know your Rh factor and get treatment as soon as possible.
Can Rh incompatibility be prevented?
Since the Rh factor is a genetic factor, we cannot choose the Rh type our baby will receive. However, the best way to prevent this problem is for the mother to know her Rh factor and, if necessary, to receive the `(RhoGAM®)` vaccine at the right time.
How does this affect an Rh-negative mother? (Finally, what you need to know - Take-Home Message)
If you are an Rh-negative mother, it is very important to be aware of these things.
Don't worry! Even if you are Rh-negative, if you get the `(RhIg)` vaccine after every possible exposure to Rh-positive blood (e.g., childbirth, some tests), you can greatly reduce the risk of your baby developing Rh disease. Remember, Rh incompatibility affects your baby's health, not yours.
By identifying your Rh factor early on, your doctor can give you the ``RhIg'' vaccine at the right time. That's the best way to keep your baby healthy.
Knowing your Rh status during pregnancy (and preferably earlier) can help prevent complications. Fortunately, your doctor can test your blood early in your pregnancy to determine whether you are Rh-positive or Rh-negative. Rh incompatibility is only a problem if you are Rh-negative and your baby is Rh-positive. Your doctor can treat this by giving you a shot of Rh immune globulin (RhIg).
So, don't be unnecessarily afraid or worried. Your doctor will take good care of you and your baby, and will provide all the necessary treatment. All you have to do is follow the doctor's instructions exactly and go for checkups regularly. Then you will have a much higher chance of having a healthy baby!
` Rh factor, Rhesus factor, pregnancy, blood type, Rh negative, Rh positive, Rh incompatibility, antibodies, RhoGAM, baby
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