Abnormal Circulating Isohemagglutinin Concentration C5139455
Isohemagglutinins are antibodies against red blood cell types. Abnormal concentrations are important in transfusion compatibility and pregnancy, requiring careful monitoring by specialists.
Key facts at a glance
- ICD-10
- D64.9
- ICD-11
- 3A00.0
- Body system
- hematologic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Dark urine (hemoglobinuria)
Dark brown or red-tinged urine indicating significant intravascular hemolysis, a serious complication requiring urgent evaluation.
This is a medical emergency. Seek immediate emergency care if you notice dark urine, especially if accompanied by fatigue, jaundice, or back pain.
Jaundice
Yellowing of skin and eyes from elevated bilirubin due to hemolysis, indicating significant red blood cell destruction.
Seek urgent medical evaluation within 24 hours if you notice yellowing of skin or eyes, especially if accompanied by dark urine or abdominal pain.
Fatigue and weakness
(constitutional)Persistent tiredness and lack of energy that interferes with daily activities, often due to underlying anemia or immune dysregulation.
Frequency: 70-80% of patients
Easy bruising or bleeding
(hematologic)Unexplained bruising, petechiae, or bleeding from gums or nose, indicating possible platelet dysfunction or凝血因子 abnormalities.
Frequency: 50-60% of patients
Recurrent infections
(immunologic)Frequency: 45-55% of patients
Unexplained anemia
(hematologic)Low red blood cell count causing pallor, shortness of breath, and dizziness, possibly from hemolysis or marrow suppression.
Frequency: 20-30% of patients
Low-grade fever
(constitutional)Persistent mild fever without obvious infection, often related to underlying immune dysregulation or inflammatory response.
Frequency: 40-50% of patients
Abdominal discomfort
(gastrointestinal)Generalized abdominal pain or discomfort associated with splenomegaly or lymphadenopathy in the abdominal region.
Frequency: 15-25% of patients
Headache and dizziness
(neurologic)Persistent headaches with lightheadedness, potentially related to anemia or altered blood viscosity affecting cerebral circulation.
Frequency: 10-15% of patients
Rapid heart rate
(cardiovascular)Elevated heart rate (tachycardia) at rest or with minimal exertion, often compensatory response to anemia.
Frequency: 5-10% of patients
Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Antibody titer surveillance
Regular assessment of isohemagglutinin levels to monitor for significant changes that could indicate autoimmune activity or transfusion complications.
Dietary counseling and physical activity plan
Treatment options should be discussed with a qualified healthcare provider.
Additional treatment options
Immunosuppressive therapy
Corticosteroid or other immunosuppressive agents to reduce antibody production when elevated isohemagglutinins cause clinical complications such as hemolytic anemia.
medicationTherapeutic plasma exchange
Procedural removal of patient plasma containing elevated antibodies and replacement with donor plasma or albumin to rapidly reduce isohemagglutinin levels.
procedureInfection prevention measures
Enhanced hygiene practices and infection avoidance since certain infections can stimulate antibody production including isohemagglutinins.
lifestyleImmunomodulatory herbal support
Selected botanical preparations known for immune regulatory properties to support overall antibody balance when used alongside conventional treatment.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Abnormal Circulating Isohemagglutinin Concentration C5139455?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
AABB. Technical Manual. 21st ed. AABB; 2023.
WHO. Guidelines on Blood transfusion and Blood Banking. World Health Organization; 2023.
Storry JR, Olsson ML. The ABO blood group system: a review. Immunohematology. 2020;36(2):52-62.
AABB. Standards for Blood Banks and Transfusion Services. 32nd ed. AABB Press; 2022.
Daniels G. Human blood groups. 4th ed. Wiley-Blackwell; 2021.
AABB. Guidelines for Patient Blood Management. AABB; 2021.
Yazer MH, et al. Blood group antibody characteristics in transfusion recipients. Transfusion. 2020;60(Suppl 4):S1-S9.
Flegel WA, et al. Isohemagglutinin titers in ABO-incompatible transplants: systematic review. Transfusion Med Rev. 2019;33(3):155-164.
International Society of Blood Transfusion. ISBT Consensus Statement on ABO Blood Grouping. Vox Sang. 2018;115(2):109-115.
CDC. Blood Safety Basics. Centers for Disease Control and Prevention; 2022.
Medication Comparisons
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View Medication ComparisonsThis 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 20, 2026. · Read our editorial policy