RHD Antibody Screening and Confirmation (Serum/Plasma)
This test detects antibodies to the RhD antigen, which can indicate whether you have developed immunity to Rh blood group factors. It’s commonly used in pregnancy to assess potential risks for Rh incompatibility.
["Checks for RhD antibodies that may affect pregnancy or blood transfusions."]
Key facts at a glance
- LOINC
- 111044-4
- Short code
- RHDV Ab Msmt Ser
- Synonyms
- RHDV Ab Msmt Ser
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters in Pregnancy
Rh incompatibility can occur when a mother’s immune system recognizes her baby’s Rh blood type as foreign. If the mother is Rh-negative and the baby is Rh-positive, her body may produce Rh antibodies, which can harm the baby’s red blood cells. This test helps identify if antibodies are present before pregnancy to plan appropriate care, such as Rh immune globulin (RhIG) treatment.
How the Test Works
The test uses a blood sample from you (collected from your vein) to detect RhD antibodies in your serum or plasma. Results are typically qualitative, meaning they show either a positive or negative presence of antibodies rather than a specific quantity.
Sample Collection and Preparation
A small amount of blood is drawn from your arm into a tube. The blood is then separated into its components, and the serum or plasma is tested for RhD antibodies. This process usually takes a few minutes and is done in a lab.
What to Expect Before the Test
You may feel slight discomfort or bruising at the injection site, but the procedure itself is quick. If you’re pregnant, your healthcare provider may schedule this test early in your pregnancy to monitor for Rh incompatibility risks.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
RHD Antibody Test
Frequently asked questions
If you have RhD antibodies, your healthcare provider will closely monitor your pregnancy to ensure the baby’s health. In some cases, Rh immune globulin may be administered to prevent antibody production in future pregnancies.
How soon will I get my results? Typically, results are available within 24 to 48 hours, but this can vary by lab. Your healthcare provider will discuss the results with you.
If your test is positive, you may need additional monitoring or treatments, such as Rh immune globulin, to protect your baby’s health. Follow your healthcare provider’s advice carefully.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy