Aborhpnlptransfrxbld
A blood test performed after a transfusion reaction to verify your ABO and Rh blood type and help identify the cause of the reaction.
{"Determines your ABO (A, B, AB, O) and Rh (positive or negative) blood type","Helps doctors diagnose and manage transfusion reactions","Uses a blood sample taken from your arm","Results are typically available within hours","Critical for ensuring safe future blood transfusions"}
Key facts at a glance
- LOINC
- 93923-1
- Short code
- ABO/Rh PTR
- Synonyms
- ABO + Rh Pnl p transf rx Bld
- Category
- chemistry
- Sample
- serum
- Container
- EDTA tube (lavender top) or serum separator tube (SST)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Serological agglutination (tube method, gel card, or slide method) with anti-A, anti-B, anti-AB, and anti-D reagents
- CPT
- 86900 (ABO typing); 86901 (Rh typing); 86850 (antibody screen - may be included in panel)
- SNOMED
- 271455004 (blood group typing); 365689006 (ABO blood group); 163719007 (Rh blood group)
- Specimen volume
- 3-5 mL whole blood
- Stability
- Room temperature (20-25°C): 72 hours; Refrigerated (2-8°C): 7 days; Do not freeze
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 1–24 hours
- Order
- routine
What is this test?
The ABO and Rh group test after a transfusion reaction is a blood test that determines your blood type (ABO and Rh factor) when a reaction has occurred during or after a blood transfusion. This test helps healthcare providers understand what went wrong and ensures you receive the correct blood type in future transfusions.
How is the test performed?
A healthcare professional will draw a small blood sample from a vein in your arm using a needle. The blood is then sent to a laboratory where technicians analyze it to determine your ABO blood group (A, B, AB, or O) and Rh status (positive or negative). This is the same testing method used for routine blood typing.
Why is this test done after a transfusion reaction?
If you experience symptoms during or after a blood transfusion—such as fever, chills, hives, itching, chest pain, dark urine, or difficulty breathing—your doctor may order this test. The results help determine if you received an incompatible blood type, which could have triggered the reaction. This information is crucial for preventing future reactions and ensuring transfusion safety.
What do the results mean?
Your test results will show your ABO blood type (A, B, AB, or O) and your Rh factor (positive or negative). Together, these determine your complete blood type—for example, A positive, O negative, AB negative, etc. If the blood you received does not match your actual blood type, this may explain the transfusion reaction. Your healthcare team will discuss your specific results with you and determine next steps for your treatment.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
No fasting required. Inform laboratory of recent transfusion (within 3 months), as donor red cells may interfere with typing). Provide clinical indication for testing (e.g., transfusion reaction, pregnancy, preoperative).
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for diagnosing hemolytic and non-hemolytic transfusion reactions. It confirms whether blood incompatibility was the cause of the reaction, which is essential for patient safety. The results guide future transfusion decisions and may reveal the need for specialized blood products. Additionally, this testing helps identify patients who may have developed antibodies against certain blood types, which is important for long-term transfusion management.
Frequently asked questions
Does it hurt?
How long does it take to get results?
Do I need to fast before this test?
What happens after the test?
Is this different from routine blood typing?
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 16, 2026. · Read our editorial policy