Rh Incompatibility in Pregnancy: What Happens When Mother is Rh Negative and Baby is Rh Positive? Se

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Introduction

Rh incompatibility occurs when a pregnant woman has an Rh-negative blood group and her baby inherits an Rh-positive blood group from the father. This condition can cause the mother's immune system to produce antibodies against the baby's red blood cells, leading to complications if not properly managed.

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What is the Rh Factor?

The Rh factor is a protein found on the surface of red blood cells.

  • Rh-positive (Rh+): The protein is present.
  • Rh-negative (Rh−): The protein is absent.

For example:

  • Mother: O Negative (O−)
  • Father: O Positive (O+)
  • Baby: May inherit Rh-positive blood.

How Does Rh Incompatibility Occur?

During pregnancy or delivery, a small amount of the baby's blood may enter the mother's bloodstream. If the mother is Rh-negative and the baby is Rh-positive, the mother's immune system may recognize the baby's red blood cells as foreign and produce antibodies against them.

This process is called Rh sensitization.

Effects on the Baby

In a sensitized mother, these antibodies can cross the placenta and destroy the baby's red blood cells, leading to:

1. Hemolytic Disease of the Fetus and Newborn (HDFN)

  • Destruction of fetal red blood cells
  • Severe anemia
  • Enlargement of the liver and spleen

2. Jaundice

  • Yellow discoloration of the skin and eyes after birth
  • Increased bilirubin levels

3. Hydrops Fetalis

  • Severe swelling in the baby due to fluid accumulation
  • Life-threatening condition

4. Stillbirth (Rare)

  • May occur in severe untreated cases

Risk to the Mother

Rh incompatibility usually does not harm the mother directly. The main concern is the effect on current or future Rh-positive pregnancies.

Diagnosis

Doctors may perform:

  • Blood group and Rh typing
  • Antibody screening (Indirect Coombs Test)
  • Ultrasound monitoring
  • Fetal Doppler studies
  • Newborn blood tests after delivery

Prevention

The condition can usually be prevented with an injection called Anti-D Immunoglobulin (RhIg).

Anti-D Injection is Given:

  • Around 28 weeks of pregnancy
  • Within 72 hours after delivery of an Rh-positive babyAfter miscarriage, abortion, ectopic pregnancy, or invasive procedures such as amniocentesis

Treatment

If Rh sensitization occurs, treatment may include:

  • Close fetal monitoring
  • Intrauterine blood transfusion (in severe cases)
  • Early delivery if needed
  • Phototherapy for newborn jaundice
  • Exchange transfusion in severe newborn cases

Conclusion

Rh incompatibility occurs when an Rh-negative mother carries an Rh-positive baby. Without proper management, it can cause serious complications for the baby. However, routine screening and timely administration of Anti-D immunoglobulin have made this condition highly preventable and manageable.

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