Aborhptransfrxbld
This test determines your ABO and Rh blood type to investigate potential blood transfusion reactions and ensure safe future blood transfusions.
{"Blood type testing verifies ABO and Rh compatibility after a transfusion reaction","Results help identify if a blood type mismatch caused the reaction","Knowing your blood type is essential for safe future transfusions","The test requires a simple blood draw","Results typically available within a few hours to a day"}
Key facts at a glance
- LOINC
- 90039-9
- Short code
- ABORH
- Synonyms
- ABO + Rh p transf rx Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- EDTA lavender top tube (K2-EDTA or K3-EDTA) or pink top tube (K2-EDTA) specifically dedicated for blood bank testing
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Serologic agglutination (tube, gel, or column method) using anti-A, anti-B, anti-AB, and anti-D (Rh) reagents with reverse grouping using A1 and B reagent red cells
- CPT
- 86900 (ABO blood typing), 86901 (Rh blood typing), 86870 (antibody screen if performed)
- SNOMED
- 365661001 (Blood type ABO), 165747007 (Blood type Rh D), 78615009 (Blood typing procedure)
- Specimen volume
- 3-5 mL minimum; 5-7 mL preferred for full blood bank workup
- Stability
- Room temperature (20-24°C): 72 hours; Refrigerated (2-8°C): up to 7 days for routine typing. Do not freeze. If testing delayed beyond 72 hours, store at 2-8°C.
- Hemolysis max
- 50
- Lipemia max
- 300
- Icterus max
- 20
- TAT
- 1–4 hours
- Order
- routine
What is this test?
The ABO and Rh blood group test after transfusion reaction is a laboratory test that determines your blood type (A, B, AB, or O) and your Rh factor (positive or negative). This test is performed specifically after someone has experienced a suspected reaction during or after a blood transfusion to help doctors understand what went wrong and prevent future complications.
Why is this test done?
This test is performed when a patient shows signs of a transfusion reaction, such as fever, chills, rash, chest pain, dark urine, or shortness of breath. The test helps healthcare providers determine if the reaction was caused by receiving blood that was not compatible with the patient's blood type. It also confirms your correct blood type to ensure any future blood transfusions are safe and properly matched.
How is the test performed?
A healthcare professional will draw a small sample of blood from a vein in your arm using a needle. The blood sample is then sent to a laboratory where technicians will test it to determine your ABO blood group and Rh factor. The test involves mixing your blood with special reagents that cause reactions if certain blood type antigens are present.
What do the results mean?
Your test results will show your ABO blood type (A, B, AB, or O) and whether you are Rh-positive or Rh-negative. If a transfusion reaction occurred, comparing your actual blood type with the blood product you received can reveal if there was a mismatch. For example, if you are type O but received type A blood, this could explain the reaction.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
No special preparation required. Verify patient identity using two patient identifiers before specimen collection. Confirm previous transfusion history and any known antibodies. Inform laboratory if patient received a transfusion within the last 3 months as this may affect interpretation.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Does it hurt?
How long does it take to get results?
Do I need to fast before this test?
What happens if my blood type doesn't match the transfused blood?
Will I need this test again in the future?
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