Blood Type & Rh Factor Test
Blood test determining your blood type and Rh status to prevent complications from Rh incompatibility.
📅 When Performed
First prenatal visit
⏱️ Results Timeline
Same day to 1-2 days
Overview
Blood type and Rh factor testing identifies your blood type (A, B, AB, or O) and whether you're Rh positive or Rh negative. This information is crucial because if you're Rh negative and your baby is Rh positive, your immune system could create antibodies against your baby's blood.
About 15% of people are Rh negative. If you're Rh negative, you'll receive RhoGAM injections during pregnancy and after delivery to prevent your body from producing antibodies that could harm this or future pregnancies.
This test is done at your first prenatal appointment and the information is critical for your care throughout pregnancy, delivery, and future pregnancies.
🎯 Purpose of Test
- •Determine blood type (A, B, AB, O)
- •Identify Rh factor (positive or negative)
- •Prevent Rh incompatibility problems
- •Plan for RhoGAM if Rh negative
- •Ensure compatible blood available if transfusion needed
- •Important for managing pregnancy complications
🔬 How It's Performed
- 1.Simple blood draw from arm
- 2.Part of initial prenatal blood panel
- 3.Lab determines ABO blood type
- 4.Tests for presence of Rh factor (D antigen)
- 5.Results available quickly
- 6.Antibody screen also performed
👀 What to Expect
- →Standard blood draw at first appointment
- →Results available same day or next day
- →If Rh negative, plan for RhoGAM at 28 weeks
- →RhoGAM also given after delivery if baby is Rh positive
- →May need RhoGAM after bleeding, amnio, or trauma
- →Blood type recorded in medical chart
✓ Normal Results
Any blood type is "normal" - results just inform your care plan
⚠️ Abnormal Results
- •Rh negative status requires RhoGAM shots
- •Positive antibody screen indicates sensitization (serious)
- •Need for special monitoring if antibodies present
- •More frequent ultrasounds to check baby
- •Possible need for early delivery or intrauterine transfusion
- •Previous sensitization complicates current pregnancy
⚠️ Risks & Considerations
- •No risks from test itself
- •Standard blood draw
- •If Rh negative, need injections (RhoGAM) but this prevents problems
📝 How to Prepare
- →No preparation needed
- →Routine part of first prenatal visit
- →Important to know for entire pregnancy
- →Previous pregnancy history matters if Rh negative