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This article was co-written by Mandpin S. Ziadie, MD. Dr. Ziadie is a licensed South Florida pathologist specializing in pathology and clinical practice. She earned her medical degree from the University of Miami School of Medicine in 2004 and completed her study in Pediatric Pathology at Children’s Medical Center in 2010.
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Knowing your blood type is important, especially if you are a blood transfusion recipient or are trying to get pregnant. The ABO blood group system classifies different blood types with the letters A, B, AB, and O. Your blood also has Rhesus or Rh factor, which can be positive or negative. You inherited your blood type and Rh factor from your parents. [1] X Trusted Source Mayo Clinic Go to Source To determine Rh factor, learn about your parents’ Rh factor for more information. You can also have a blood test done at the clinic.
Steps
Using Available Information to Determine Rh . Factor
- People with Rh factor have a positive blood type such as A+, B+, AB+, or O+. People without the Rh factor have a negative blood type, for example A-, B-, AB-, or O-.
- Most people have the Rh factor in their blood. [3] X Trusted Source Mayo Clinic Go to Source
- If you have a positive Rh factor in your blood, you can receive either Rh+ or Rh- blood type with a blood transfusion. And if you have Rh- blood type, you can only receive Rh- blood type [4] X Research source (except for emergencies that can be life-threatening, you need to receive Rh+ blood group) .
- Since each person with a positive blood type can possess both Rh positive genes (Rh+/Rh+) or one Rh positive gene and one Rh negative gene (Rh+/Rh-), there are cases where both parents have The blood group is positive but the child has a negative blood group. [7] X Research Sources
Take a Blood Type Test
- Doctors often take a blood sample from children on the back of their hand. [9] X Trusted Source National Health Service (UK) Go to Source
- If you feel you are about to faint, tell the nurse. They will help you lie down. [10] X Trusted Source National Health Service (UK) Go to Source
- You may feel pain, throbbing, or mild pain when the nurse inserts the needle. After the blood is drawn, you may experience bruising in the area where the needle was inserted. This pain usually does not last long. [11] X Research Source
- The lab may also test your blood type for the ABO system during this process.
- During pregnancy, if you have Rh- blood type, you need to have your blood tested to see if your body has produced antibodies against Rh+ blood type. The first screening is during the first 3 months of pregnancy and the second will take place at the 28th week of pregnancy. If antibodies do not appear, you will be given an injection of Rh immune serum. This shot will stop your body from making dangerous antibodies against your baby. [14] X Trusted Source Mayo Clinic Go to Source
- If your body produces antibodies against Rh+ blood type, you cannot inject Rh immune serum. Instead, your doctor will closely monitor your child’s development. Before or after birth, the baby will receive a blood transfusion. [15] X Trusted Source Mayo Clinic Go to Source
- Once the baby is born, the doctor can check the baby’s Rh blood type. If your child has the same Rh blood type as you, you do not need to continue treatment. If you are Rh- but your child is Rh+, you will need another dose of Rh immune serum. [16] X Trusted Source Mayo Clinic Go to Source
This article was co-written by Mandpin S. Ziadie, MD. Dr. Ziadie is a licensed South Florida pathologist specializing in pathology and clinical practice. She earned her medical degree from the University of Miami School of Medicine in 2004 and completed her study in Pediatric Pathology at Children’s Medical Center in 2010.
This article has been viewed 31,996 times.
Knowing your blood type is important, especially if you are a blood transfusion recipient or are trying to get pregnant. The ABO blood group system classifies different blood types with the letters A, B, AB, and O. Your blood also has Rhesus or Rh factor, which can be positive or negative. You inherited your blood type and Rh factor from your parents. [1] X Trusted Source Mayo Clinic Go to Source To determine Rh factor, learn about your parents’ Rh factor for more information. You can also have a blood test done at the clinic.
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