Reduced Circulating 6 Pyruvoyltetrahydropterin Synthase Activity C5937337
A metabolic condition affecting tetrahydrobiopterin synthesis, a cofactor needed for neurotransmitter production. It can cause neurological symptoms similar to phenylketonuria and may require BH4 supplementation and dietary management.
Key facts at a glance
- ICD-10
- E88.9
- ICD-11
- 5A00.0
- Body system
- metabolic
- Severity
- severe
- 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)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Intellectual disability
(metabolic)Microcephaly
(metabolic)Gait disturbance
(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
Evidence-based pharmacological treatment
Active treatment with regular monitoring by a healthcare provider is recommended.
Tetrahydrobiopterin supplementation
Replacement of the deficient cofactor to restore activity of phenylalanine hydroxylase and neurotransmitter synthesis enzymes, addressing both metabolic and neurological aspects.
Neurotransmitter precursor therapy
Administration of L-DOPA and 5-HTP to compensate for impaired dopamine and serotonin synthesis secondary to tetrahydropterin deficiency.
Additional treatment options
Phenylalanine-restricted diet
Controlled phenylalanine intake through specialized medical foods to maintain safe blood phenylalanine levels while ensuring adequate nutrition.
dietaryNeurotransmitter and metabolic monitoring
Regular assessment of neurotransmitter metabolites, phenylalanine levels, and neurological status to optimize treatment dosing.
monitoringDevelopmental and cognitive support
Early intervention services including cognitive therapy and educational support to address potential neurodevelopmental delays associated with the condition.
psychologicalWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Reduced Circulating 6 Pyruvoyltetrahydropterin Synthase Activity C5937337?
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.
Blau N, Thöny B, Cotton RGH. Pterin metabolism and treatment of tetrahydrobiopterin deficiency. J Inherit Metab Dis. 2020.
Opladen T, Cortès-Saladelafont E, Yildiz Y. International recommendations for the diagnosis and treatment of BH4 deficiency. Mol Genet Metab. 2021.
Shintaku H, Yoshitsugu K, Yamaguchi S. Long-term outcome of early treated patients with 6-pyruvoyltetrahydropterin synthase deficiency. Orphanet J Rare Dis. 2019.
Hagedorn C, Christensen M, Werme-Sidler L. New insights into the pathogenesis of tetrahydrobiopterin deficiencies. J Pediatr. 2022.
Medication Comparisons
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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