Test Price
2,800 AED✅ Home Collection Available
GCH1 Gene Hyperphenylalaninemia, BH4-Deficient Type B, Genetic Test in UAE | 2,800 AED
Executive Summary & Core Metrics
- ✔ 99.9% Diagnostic Sensitivity – ISO 9001:2015 accredited laboratory (Cert: INT/EGQ/2509DA/3139) utilizing next‑generation sequencing for definitive molecular diagnosis.
- ✔ VIP Mobile Phlebotomy & Cold‑Chain Logistics – ISO‑certified temperature‑controlled specimen transport available daily from 8 AM to 11 PM across all seven Emirates.
- ✔ Post‑Test Clinical Guidance – Telephonic interpretation and genetic counselling provided by a DHA‑licensed Consultant Medical Genetics.
- ✔ Direct Insurance Billing Support – Submit your policy details via WhatsApp +971 54 548 8731 for instant verification and seamless processing.
Test Overview & Methodology
This targeted next‑generation sequencing (NGS) assay analyzes the GCH1 gene to confirm a molecular diagnosis of BH4‑deficient hyperphenylalaninemia type B. Early identification of pathogenic variants is critical in the UAE to initiate life‑altering therapies—including sapropterin dihydrochloride and neurotransmitter precursors—and to prevent irreversible neurometabolic deterioration.
| Feature | Our Test – DNA Analysis (NGS) | Closest Alternative – BH4 Loading Test |
|---|---|---|
| Method | Next‑Generation Sequencing (Illumina® platform) | Amino acid assay before/after oral BH4 load |
| Diagnostic Precision | 99.9% sensitivity; identifies exact pathogenic variant | ~70% sensitivity; can be confounded by concurrent illness |
| Turnaround Time | 3–4 Weeks | 2–3 Days (but often requires repeat sampling) |
| Specimen | Blood, extracted DNA, or dried blood spot (FTA card) | Multiple blood draws (pre‑ & post‑load) |
Physician Insight & Safety Protocols
“The GCH1 gene encodes GTP cyclohydrolase I, the rate‑limiting enzyme in tetrahydrobiopterin (BH4) biosynthesis. A pathogenic variant disrupts BH4 production, leading to impaired neurotransmitter synthesis and hyperphenylalaninemia. Genetic confirmation via NGS is essential for differentiating this condition from classic phenylketonuria and for guiding precise therapy. Results must be interpreted by a qualified clinical geneticist in conjunction with plasma phenylalanine levels and neurotransmitter metabolite profiles. Always correlate molecular findings with neurological examination and imaging before altering any therapeutic regimen.”
— Lina Osama Zaki Quteineh, Consultant Medical Genetics, DHA Registration ID: 9294403
Important Medication Advisory
⚠ Medication Warning
Do not alter or discontinue prescribed therapies (e.g., levodopa, carbidopa, sapropterin, or anticonvulsants) without consulting your treating neurologist. Abrupt cessation of neurotransmitter precursors can provoke a life‑threatening dystonic crisis or acute encephalopathy. This test is a diagnostic aid and does not replace clinical expertise.
Exclusion Criteria & Emergency Red Flags
- Do not proceed with this test if acute metabolic decompensation is suspected (e.g., intractable vomiting, lethargy, seizures, or coma). Immediate hospital admission is required for metabolic stabilization.
- Not indicated for patients with previously confirmed classic phenylketonuria due to biallelic PAH mutations who lack clinical features suggestive of BH4 deficiency (e.g., progressive dystonia, oculogyric crises).
- Seek emergency care if: the patient develops severe dystonic spasms, oculogyric crises, abrupt loss of ambulation, or any signs of encephalopathy.
Patient FAQ & Clinical Guidance
1. What is the purpose of the GCH1 gene test for hyperphenylalaninemia?
This NGS test identifies disease‑causing variants in the GCH1 gene to definitively diagnose BH4‑deficient hyperphenylalaninemia type B. The result distinguishes patients who require lifelong BH4 and neurotransmitter replacement therapy from those with phenylalanine hydroxylase deficiency. Early molecular diagnosis prevents irreversible neurological damage and optimizes long‑term developmental outcomes.
2. How is the test performed and what is the turnaround time?
A simple blood draw, buccal swab, or dried blood spot on an FTA card is collected at your location. Our VIP mobile phlebotomy team visits your home or office across all Emirates, and the sample is transported under strict cold‑chain conditions to our accredited laboratory. Results are typically available within 3 to 4 weeks.
3. Is home collection available across the UAE, and what about insurance coverage?
Yes, we provide VIP mobile phlebotomy services throughout all seven Emirates daily from 8 AM to 11 PM. Most leading UAE health insurance providers cover genetic testing when a prior clinical indication is documented by a specialist. For direct billing verification and to check your policy coverage, send your details via WhatsApp to +971 54 548 8731.
UAE Regulatory & Data Privacy Adherence
This laboratory facility operates under DHA Facility License Number 1143, strictly adhering to the Federal Decree-Law No. 4 of 2016 on Medical Liability, the Federal Decree-Law No. 45 of 2021 on Personal Data Protection (PDPL), and Federal Law No. 2 of 2019 Concerning the Use of Information and Communication Technology in Health Fields. All genetic data handling and patient information are managed with the highest standards of confidentiality, integrity, and clinical safety in accordance with UAE federal law. Pre‑test genetic counselling by a DHA‑licensed professional is mandatory before sample collection.
Clinical & Logistical Metadata
| Test Name | GCH1 Gene Hyperphenylalaninemia, BH4-Deficient Type B, Genetic Test |
| Price (AED) | 2,800 AED |
| Turnaround Time | 3–4 Weeks |
| Sample Type / Matrix | Peripheral Whole Blood, Extracted DNA, or Dried Blood Spot (FTA Card) |
| Methodology Used | Next-Generation Sequencing (NGS) – Illumina® Platform |
| ICD-10-CM Code | E70.1 |
| LOINC Code | 100363-1 |
| DHA Facility License & Laboratory Address | DHA License: 1143 | Address: Premises 105, Floor 1, Building 33, Dubai Healthcare City, Dubai, UAE |
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