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This test monitors changes in your blood type after receiving a stem cell transplant to ensure safe blood transfusions.
{"After stem cell transplant, your blood type may change to match your donor's blood type","Regular testing ensures blood transfusions are safe and compatible","The test checks both ABO and Rh blood group systems","Results help your healthcare team provide the correct blood type for transfusions"}
Key facts at a glance
- LOINC
- 93933-0
- Short code
- ABO/Rh Post-BMT
- Synonyms
- ABO+Rh Gp Pnl p stem trnsplt Bld
- Category
- chemistry
- Sample
- serum
- Container
- EDTA lavender top tube (K2-EDTA) preferred; ACD (yellow top) tube also acceptable
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–150 years
- Method
- Serum agglutination techniques including ABO forward typing (red cell antigens) and Rh typing (D antigen), with confirmatory testing for post-transplant chimerism monitoring
- CPT
- 86900 (ABO typing), 86901 (Rh typing), 86850 (antibody screen post-transplant)
- SNOMED
- 59321007 (blood typing procedure)
- Specimen volume
- Minimum 2 mL, optimal 3-5 mL of whole blood
- Stability
- Room temperature (20-24°C): 72 hours; Refrigerated (2-8°C): 7 days. Do not freeze whole blood specimen. For prolonged delays, separate plasma/serum and store at 2-8°C.
- Hemolysis max
- 50
- Lipemia max
- 400
- Icterus max
- 25
- TAT
- 1–24 hours
- Order
- routine
What is this test?
The ABO and Rh group test after hematopoietic stem cell transplant is a blood test that checks your blood type. After a stem cell transplant, the new stem cells from your donor will produce red blood cells that may have a different blood type than what you had before. This test helps your healthcare team track these changes and ensure you receive the correct blood type if you need a transfusion.
How is the test performed?
A healthcare professional will draw a small blood sample from a vein in your arm. The blood sample is sent to a laboratory where technicians will determine your ABO blood type (A, B, AB, or O) and your Rh status (positive or negative). The test is simple and takes only a few minutes to collect the sample.
Why is this test important after transplant?
Stem cell transplants replace your bone marrow with donor cells. These new cells produce red blood cells carrying the donor's blood group antigens. Over time, your blood type may gradually change to match your donor's blood type. This process is called chimerism. Regular testing helps your doctors know your current blood type so they can give you the right blood products if you need transfusions during your recovery.
How often will I need this test?
Your doctor will determine how often you need this test. It is typically done regularly during the first few months after your transplant, and then less frequently as your blood type stabilizes. Follow your transplant team's recommended testing schedule.
Reference range
Expected results: ABO blood group (A, B, AB, or O) and Rh status (Rh-positive or Rh-negative). Post-transplant patients may show mixed chimerism with dual populations or conversion to donor血型. Reference range indicates presence of expected ABO/Rh antigens based on donor/recipient status.N/A
No fasting required. Inform laboratory of recent transfusions (within 3 months), as donor red cells may interfere with typing. Provide complete transplant history including date of hematopoietic stem cell transplant, donor ABO/Rh type, and any recent transfusion products. Verify patient identity using two patient identifiers per CAP/CLIA requirements.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Will my blood type definitely change after transplant?
How long does it take for blood type to change?
Does this test hurt?
Do I need to fast before this test?
What happens if my blood type doesn't match before a transfusion?
Sources
- 1
- 2
- 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 10, 2026. · Read our editorial policy