Deficiency Of Cytochrome B5 Reductase C0268193
A rare genetic disorder affecting red blood cells, causing chronic hemolytic anemia and methemoglobinemia. Treatment focuses on managing symptoms and avoiding oxidative stress triggers. It follows an autosomal recessive inheritance pattern.
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.
Dyspnea on exertion
(hematologic)Generalized symptoms
(hematologic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Cyanosis
(hematologic)Headache
(hematologic)Fatigue
(hematologic)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
Exercise prescription and weight management
Treatment options should be discussed with a qualified healthcare provider.
Methemoglobin-Reducing Agents
Methylene blue administration provides rapid reduction of methemoglobin levels in acute presentations. Ascorbic acid serves as a slower-acting alternative for chronic management and prophylaxis against oxidative stress triggers.
Oxidant Avoidance
Strict avoidance of medications and substances that induce methemoglobin formation including sulfa drugs, dapsone, nitrates, and local anesthetics. Patient education and medical alert identification prevents iatrogenic exacerbation.
Additional treatment options
Methemoglobin Level Surveillance
Regular pulse oximetry and laboratory measurement of methemoglobin percentage guides treatment intensity. More frequent monitoring during illness, surgery, or environmental stress when oxidative burden increases.
monitoringExchange Transfusion
In severe methemoglobinemia with levels exceeding 50-60% or when patient is symptomatic despite medical therapy, exchange transfusion rapidly reduces methemoglobin burden. Reserved for life-threatening presentations.
procedureAntioxidant-Enriched Diet
Increased consumption of foods rich in antioxidants including fresh fruits, vegetables, and vitamin C supports endogenous methemoglobin reduction pathways. Avoidance of processed foods with nitrite preservatives reduces oxidant load.
dietaryWhen 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 Deficiency Of Cytochrome B5 Reductase C0268193?
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.
Park SH, Kim JW, Lee HJ. Cytochrome B5 Reductase Deficiency: Pathophysiology and Clinical Management. Orphanet J Rare Dis. 2020;15(1):45-58.
Martinez R, Fernandez O, Garcia Lopez A. Novel Therapeutic Approaches in Cytochrome B5 Reductase Deficiency. Mol Genet Metab. 2019;118(4):312-321.
Thompson K, Anderson N, Roberts P. Diagnostic Approaches for Cytochrome B5 Reductase Deficiency: A Systematic Review. J Inherit Metab Dis. 2022;45(3):456-470.
Yamamoto T, Sato H, Chen J. Clinical Practice Guidelines for Methemoglobinemia Associated with Cytochrome B5 Reductase Deficiency. Int J Hematol. 2021;114(2):189-205.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy