Rh is a protein found on the surface of red blood cells. Most people are RH positive – they have RH on their red blood cells. Those who do not have this protein are said to be HR negative.
Just like ABO blood groups, RH is its own blood grouping system.
An HR positive person cannot donate blood to an HR negative person. If they did, the recipient’s body would produce specific antibodies against the RH protein and cause a transfusion reaction in the recipient, which could be fatal in extreme cases.
Why Performed This Test:
Rh antibody titers are prescribed for pregnant women who test positive for the presence of Rh antibodies.
While the woman may not have any symptoms related to Rh incompatibility. Her baby may have the following conditions:
- Hemolytic anemia: This is a condition caused by the rapid destruction of red blood cells. Some of the symptoms of hemolytic anemia are:
- Big abdomen
- Lack of energy
- Jaundice (yellow discoloration of the skin and the white part of the eyes)
- Pale skin
- Rapid breathing
- Rapid heartbeat
- Hydrops fetalis: This is a condition in which fluid builds up in various parts of the body. Some of the symptoms seen are:
- Excess fluid in the stomach, lungs, or scalp
- Large liver, spleen or heart
No need any Preparation for this test
A normal test result will be reported as compatible, i.e. no Rh antibodies are found.
A titer greater than 1:4 indicates Rh incompatibility (Rh alloimmunization).
An antibody titer level of 1:8 or less can easily be managed by checking the mother’s antibody levels. However, if the titer values are 1:16 or more, it is necessary to check the health of the baby.
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