Test Price
1,500 AED✅ Home Collection Available
C1 Esterase Inhibitor Functional Test in UAE | 1500 AED | DHA Licensed
Executive Summary & Core Metrics
Clinical Precision: The C1 Esterase Inhibitor Functional Test delivers 99.9% Diagnostic Sensitivity for Hereditary Angioedema (HAE) Type I and Type II differentiation, processed through ISO 9001:2015 accredited laboratory protocols. This quantitative Enzyme Immunoassay (ELISA) measures the functional inhibitory activity — not merely the antigenic presence — of C1-INH protein, establishing the gold standard for confirming complement system disorders where antigenic assays alone may miss Type II HAE due to normal protein levels with dysfunctional C1-INH.
VIP Mobile Phlebotomy & Temperature-Controlled Cold-Chain Home Collection available daily from 8 AM to 11 PM across all Emirates. Serum separation within 1 hour, immediate flash-freezing, and frozen transport maintained at -20°C throughout.
Complimentary Telephonic Post-Test Clinical Guidance for result interpretation. Direct Billing Insurance Verification via WhatsApp: +971 54 548 8731. Same-day pre-authorization for major UAE insurers including Daman, AXA, MetLife, and Neuron.
Test Overview & Methodology
The C1 Esterase Inhibitor (C1-INH) Functional Test quantifies the enzymatic inhibitory activity of C1-INH protein in serum — a critical regulator of the classical complement pathway, kallikrein-kinin system, and coagulation cascade. Deficient or dysfunctional C1-INH leads to uncontrolled bradykinin production, manifesting clinically as Hereditary Angioedema (HAE) with recurrent, potentially life-threatening submucosal and subcutaneous swelling. This test is indispensable for differentiating HAE from histaminergic angioedema and guiding targeted prophylaxis with C1-INH concentrates, icatibant, or ecallantide.
Pre-Test Requirements & Specimen Handling Protocol
| Parameter | C1-INH Functional Test (ELISA) | C1-INH Antigenic Test (Alternative) |
|---|---|---|
| What It Measures | Functional inhibitory activity — how effectively C1-INH works | Quantitative protein concentration only |
| HAE Type II Detection | ✓ Detects Type II — low function despite normal protein levels | ✗ Misses Type II — protein levels appear normal |
| Methodology | Enzyme Immunoassay (ELISA) — Quantitative Functional | Nephelometry / Radial Immunodiffusion |
| Sensitivity for HAE | 99.9% — Both Type I & Type II | ~85% — Type I only; Type II missed entirely |
| Turnaround Time | Sample by 7th of month; Report in 2–3 weeks (batch-processed) | 3–7 days (routine lab) |
| Clinical Utility | Definitive diagnosis — guides life-saving therapy selection | Screening only — requires functional confirmation |
Physician Insight & Safety Protocols
A Note from Dr. Ajay Singh, DHA Registration ID: 36234132:
"The C1 Esterase Inhibitor Functional Test is a definitive confirmatory assay reserved for patients with a high clinical index of suspicion for Hereditary Angioedema. In my practice, I have encountered families where recurrent abdominal attacks and orofacial swelling went undiagnosed for years until this functional assay revealed the underlying complement deficiency. A normal result does not exclude all complement disorders; clinical correlation with complement C4 levels, C1q binding assays, and genetic testing for SERPING1 mutations remains essential. This test demands meticulous pre-analytical handling — even a single freeze-thaw cycle can denature the labile C1-INH protein and yield a falsely low result."
Critical Medication Advisory
Do not discontinue any prescribed medication without consulting your treating physician. Patients on danazol, stanozolol, tranexamic acid, or C1-INH replacement therapy (Berinert, Cinryze, Haegarda) must inform their ordering physician, as these agents directly modulate C1-INH levels and functional activity. Abrupt cessation of prophylactic androgens may precipitate an acute HAE attack, including life-threatening laryngeal edema.
Patient Safety: Exclusion Criteria & Emergency Red Flags
Exclusion Criteria — Do Not Collect If:
- Patient received C1-INH concentrate infusion within the past 72 hours (falsely normalizes functional activity).
- Serum cannot be separated and frozen within 1 hour of venipuncture — delayed processing degrades C1-INH.
- SST gel barrier tubes used — gel interferes with the ELISA reaction; only Red Top (No Additive) tubes are acceptable.
- Sample previously thawed — even one freeze-thaw cycle invalidates results. DO NOT THAW.
- Patient is experiencing an acute phase response (CRP >50 mg/L) — may transiently elevate C1-INH as an acute phase reactant.
- Form 35 (Test Send Out Consent Form) not duly filled and signed.
Emergency Red Flags — Seek Immediate ER Care If:
- Swelling of the tongue, throat, or larynx with voice changes or stridor — impending airway obstruction.
- Severe abdominal pain with vomiting and guarding — may indicate intestinal angioedema mimicking acute abdomen.
- Facial or periorbital swelling progressing rapidly within minutes to hours.
- Any swelling that does not respond to antihistamines, corticosteroids, or epinephrine — hallmark of bradykinin-mediated HAE.
- Family history of sudden death from choking or unexplained laryngeal edema.
Patient FAQ & Clinical Guidance
1. Why is the functional C1-INH test preferred over the antigenic C1-INH test for diagnosing Hereditary Angioedema?
The functional C1-INH assay measures actual inhibitory enzyme activity, making it the only test capable of detecting Type II HAE where C1-INH protein levels are normal but the protein is dysfunctional. Approximately 15% of HAE patients have Type II disease with normal or even elevated C1-INH antigen levels — these cases are completely missed by antigenic assays alone. The functional ELISA quantifies the residual esterase inhibitory capacity, providing a comprehensive assessment that distinguishes healthy individuals from both Type I (low protein, low function) and Type II (normal protein, low function) HAE patients. This diagnostic precision directly impacts treatment selection, as icatibant and ecallantide are effective regardless of HAE type, while C1-INH concentrate dosing may differ.
2. What precautions are essential for accurate C1-INH functional test results?
Meticulous pre-analytical handling is non-negotiable: serum must be separated within 60 minutes of venipuncture, immediately frozen at -20°C, and transported on dry ice without any thawing. C1-INH is a thermolabile protein susceptible to in-vitro degradation; even a single freeze-thaw cycle reduces functional activity by 30–50%, generating falsely low results that may lead to an erroneous HAE diagnosis. Additionally, blood must be collected in plain Red Top tubes without gel separators, as SST gel barriers adsorb complement proteins and interfere with the ELISA detection system. Patients receiving C1-INH replacement therapy should ideally pause infusions 72 hours before testing under physician supervision, and acute illness with elevated CRP should be resolved prior to sample collection, as C1-INH behaves as an acute-phase reactant.
3. How should patients interpret a low C1-INH functional result and what are the next clinical steps?
A low C1-INH functional result below 40% of the normal reference range is highly suggestive of C1-INH deficiency and warrants immediate confirmatory testing with complement C4 levels and SERPING1 genetic analysis. C4 is a natural substrate consumed during unchecked classical pathway activation; a concomitantly low C4 level below 30% of normal strongly supports the diagnosis of HAE and helps differentiate C1-INH deficiency from acquired angioedema where C1q levels are also reduced. All first-degree relatives of confirmed HAE patients should undergo cascading family screening. DHA guidelines recommend referral to a Clinical Immunologist for comprehensive management, including a written emergency action plan for acute attacks, home-based rescue medication (icatibant or C1-INH concentrate), and documentation of HAE diagnosis for emergency department visits.
UAE Regulatory & Data Privacy Adherence
Federal Decree-Law No. 45 of 2021 on Personal Data Protection (PDPL): All patient identifiers, genetic information, and test results are encrypted and stored on secure, UAE-sovereign servers in full compliance with the PDPL. Data is never shared with third parties without explicit patient authorization.
Federal Law No. 2 of 2019 Concerning the Use of Information and Communication Technology in Health Fields: This laboratory strictly adheres to all provisions governing the secure handling, storage, and transmission of electronic health data as mandated by UAE law.
Federal Decree-Law No. 4 of 2016 on Medical Liability: All clinical testing, patient consent protocols, and safety procedures are conducted in accordance with this law, ensuring full accountability and patient protection throughout the diagnostic process.
ISO 9001:2015 Certification: Validated Quality Management System ensuring consistent, reproducible, and internationally benchmarked diagnostic accuracy.
Clinical & Logistical Metadata
| Test Name | C1 Esterase Inhibitor Functional Test |
| Price (AED) | 1,500 AED |
| Turnaround Time | Sample by 7th of month; Report delivered within 2–3 weeks (batch-processed) |
| Sample Type / Matrix | Serum (2 mL, 0.5 mL minimum) — Red Top No Additive tube only |
| Methodology Used | Enzyme Immunoassay (ELISA) — Quantitative Functional Assay |
| ICD-10-CM Code | D84.1, T78.3XXA, Z15.89 |
| LOINC Code | 4477-9 |
| DHA Facility License & Laboratory Address | DHA Facility License No: 1143 | Premises 105, Floor 1, Building 33, Dubai Healthcare City, Dubai, UAE | Corporate Lab: DNA Labs UAE |
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