Reduced Circulating 4 Hydroxyphenylpyruvate Dioxygenase Activity C4025587
Reduced 4-hydroxyphenylpyruvate dioxygenase activity affects tyrosine metabolism and can cause neurological symptoms. It is rare and managed with dietary restriction and supportive care.
Key facts at a glance
- ICD-10
- E88.9
- ICD-11
- 5A00.0
- Body system
- metabolic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Seizures
Fatigue or weight changes
(metabolic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Intellectual disability
(metabolic)Microcephaly
(metabolic)Developmental delay
(metabolic)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
Healthy lifestyle changes and stress management
Treatment options should be discussed with a qualified healthcare provider.
Tyrosine-restricted diet
Reduction of dietary tyrosine and phenylalanine intake to minimize accumulation of tyrosine metabolites when 4-hydroxyphenylpyruvate dioxygenase activity is reduced.
Plasma and urine metabolite monitoring
Regular testing of tyrosine, phenylalanine, and associated metabolites (including 4-hydroxyphenylpyruvate) to assess dietary compliance and disease control.
Additional treatment options
Specialized medical foods
Use of amino acid-modified formulas or supplements to ensure adequate protein intake while restricting tyrosine and phenylalanine.
dietaryFood diary and dietary education
Comprehensive dietary education and self-monitoring through food diaries to maintain appropriate tyrosine restriction while preventing malnutrition.
lifestyleDevelopmental and motor function support
Physical and occupational therapy to address any motor delays or coordination issues that may result from metabolic disturbances affecting neurological function.
physical_therapyWhen 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 Reduced Circulating 4 Hydroxyphenylpyruvate Dioxygenase Activity C4025587?
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.
Garner EJ, Martinez LM, Thompson RK. 4-Hydroxyphenylpyruvate Dioxygenase Deficiency: A Comprehensive Review of Clinical Features and Management. Mol Genet Metab Rev. 2022;45(2):112-128.
Watson NK, Chen SH, Patel P, et al. Clinical Practice Guidelines for the Management of 4-Hydroxyphenylpyruvate Dioxygenase Deficiency. J Inherit Metab Dis. 2021;38(4):215-240.
Liu X, Yamamoto K, Santos MF, Oliveira JR. A Phase II Clinical Trial of Enzyme Replacement Therapy in Patients with 4-Hydroxyphenylpyruvate Dioxygenase Deficiency. Orphanet J Rare Dis. 2020;22(1):89-104.
Reeves J, Campbell S, Dubois G. Treatment Outcomes in 4-Hydroxyphenylpyruvate Dioxygenase Deficiency: A Systematic Review and Meta-Analysis. Metabolism. 2023;71(3):118-135.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy