Test Price
1,800 AED✅ Home Collection Available
von Willebrand Factor Antigen (vWF:Ag) Test in UAE | 1,800 AED | 2026 DHA Guidelines
تحليل مستضد عامل فون ويلبراند (vWF:Ag) في الإمارات | 1,800 درهم | معتمد من هيئة الصحة بدبي 2026
📋 Executive Summary
The von Willebrand Factor Antigen (vWF:Ag) Test quantifies the concentration of von Willebrand factor protein in plasma — a critical glycoprotein essential for platelet adhesion and factor VIII stabilization. This assay is the frontline diagnostic tool for screening von Willebrand Disease (VWD), the most common inherited bleeding disorder. Performed via Chemiluminescent Immunoassay (CLIA) on freshly processed platelet-poor plasma, our protocol delivers 99.9% diagnostic sensitivity under ISO 9001:2015 accredited workflows (Cert: INT/EGQ/2509DA/3139). Results are reported same-day by 6 PM when samples are received by Wednesday 11 AM, supported by paid hospital-grade home collection with ISO-certified cold-chain logistics and VIP mobile phlebotomy across all Emirates. Telephonic post-test clinical guidance and direct insurance billing verification are available via WhatsApp at +971 54 548 8731.
يُعد تحليل مستضد عامل فون ويلبراند (vWF:Ag) فحصاً مخبرياً متخصصاً لتقييم اضطرابات التخثر النزفية الوراثية، ويُجرى وفق أعلى معايير الجودة العالمية وتحت إشراف هيئة الصحة بدبي. يضمن مختبرنا الحاصل على شهادة الأيزو 9001:2015 دقة تشخيصية تصل إلى 99.9% مع خدمة سحب منزلي متميزة بسلسلة تبريد معتمدة ونقل فوري للعينات. تتوفر الاستشارة الطبية الهاتفية بعد النتيجة والتحقق المباشر من التغطية التأمينية عبر الواتساب.
Hospital-Grade Home Collection
8 AM – 11 PM • ISO Cold-Chain
Telephonic Clinical Guidance
Post-Test Result Interpretation
WhatsApp Insurance Check
+971 54 548 8731
99.9% Diagnostic Sensitivity
ISO 9001:2015 Certified
🔍 Clinical Overview
The von Willebrand Factor Antigen (vWF:Ag) Test measures the total amount of von Willebrand factor protein circulating in the blood. This protein plays a dual role in hemostasis: it mediates platelet adhesion to injured vessel walls and serves as the carrier protein for coagulation factor VIII, protecting it from proteolytic degradation. A deficiency or dysfunction of vWF leads to von Willebrand Disease (VWD) — a condition affecting up to 1% of the global population — characterized by mucocutaneous bleeding, easy bruising, prolonged bleeding after trauma or surgery, and in severe cases, joint bleeding mimicking hemophilia. In the UAE, where consanguinity rates elevate the prevalence of autosomal inherited bleeding disorders, accurate quantitative vWF:Ag testing is an essential component of the diagnostic hemostasis workup.
| Parameter | Our Test (CLIA) | Alternative (ELISA) |
|---|---|---|
| Methodology | Chemiluminescent Immunoassay (CLIA) | Enzyme-Linked Immunosorbent Assay (ELISA) |
| Analytical Sensitivity | 0.5 IU/dL (Ultra-Trace Detection) | ~1.5 IU/dL |
| Turnaround Time | Same Day by 6 PM | 2–3 Working Days |
| Sample Stability | PPP Frozen • Strict Cold-Chain | Variable • Batch Processing |
| Accreditation | ISO 9001:2015 • DHA-Compliant | Varies by Facility |
| Price | 1,800 AED | 1,200–2,000 AED (Range) |
🩺 Physician Insight & Safety Protocol
Dr. Prabhakar Reddy
Consultant Hematologist • DHA License: 61713011
"A single vWF:Ag value must never be interpreted in isolation. I always correlate antigen levels with functional assays — vWF:RCo (ristocetin cofactor) or vWF:GPIbR — alongside factor VIII activity, as type 2 VWD variants may present with normal antigen levels but profoundly impaired function. Additionally, vWF is an acute-phase reactant; stress, pregnancy, inflammation, and estrogen therapy can transiently elevate levels into the normal range even in genuinely deficient patients, potentially masking mild type 1 VWD. Repeat testing during a quiescent, non-stressed state is often clinically necessary to avoid false reassurance."
⚠️ Critical Medication Advisory
Do not discontinue prescribed medication without consulting your treating physician. Heparin must be withheld for 1 day and oral anticoagulants (e.g., warfarin, rivaroxaban, apixaban, dabigatran) for 7 days prior to blood sampling — but only with the explicit prior consent and guidance of your doctor. Abrupt anticoagulant cessation without medical supervision can precipitate life-threatening thromboembolic events. All medication adjustments must be physician-directed.
🚨 Exclusion Criteria & ER Red Flags
Exclusion Criteria (Do Not Collect):
- Active, uncontrolled bleeding or hemodynamic instability — proceed directly to emergency care
- Acute febrile illness or systemic infection (vWF is an acute-phase reactant; values will be unreliable)
- Recent major surgery or trauma within 14 days
- Current pregnancy or immediate postpartum period (physiologic vWF elevation)
- Strenuous exercise within 24 hours (transiently elevates vWF levels)
- Inability to produce a viable platelet-poor plasma sample (severe lipemia, hemolysis, or icterus)
ER Red Flags — Seek Immediate Care If:
- Spontaneous joint hemorrhage (hemarthrosis) with swelling, warmth, and loss of range of motion
- Unprovoked intramuscular hematoma causing compartment syndrome symptoms
- Persistent epistaxis unresponsive to 20 minutes of direct pressure
- Gastrointestinal bleeding evidenced by hematemesis, melena, or hematochezia
- Heavy menstrual bleeding with hemodynamic compromise (tachycardia, orthostatic hypotension, syncope)
- Prolonged, uncontrolled bleeding following any dental extraction or minor surgical procedure
📦 Specimen Collection & Logistics Protocol
Sample Type:
3 mL whole blood collected in 1 Blue Top (3.2% Sodium Citrate) tube. Mix thoroughly by gentle inversion 5–6 times immediately after collection.
Critical Processing Window:
Transport whole blood to the laboratory within 4 hours at ambient temperature (20–25°C). If transport cannot be guaranteed within this window, platelet-poor plasma (PPP) must be prepared on-site within 1 hour.
PPP Preparation (If Required):
Centrifuge at 3,600 rpm for 15 minutes. Transfer supernatant to a clean plastic tube. Centrifuge supernatant again at 3,600 rpm for 15 minutes. Transfer final supernatant (PPP) to a labeled, clean, plastic screw-capped vial. Freeze immediately at −20°C or below. Ship frozen. Do not thaw.
Pre-Test Requirements:
Overnight fasting (8–12 hours) is preferred. Duly filled Coagulation Requisition Form (Form 15) is mandatory. Heparin discontinued for 1 day; oral anticoagulants for 7 days — only with treating physician consent. Avoid strenuous exercise, alcohol, and NSAIDs for 24 hours prior.
❓ Patient FAQ & Clinical Guidance
Q1: What is the von Willebrand Factor Antigen test and why is it ordered?
The von Willebrand Factor Antigen (vWF:Ag) test quantifies the total protein amount of von Willebrand factor in your blood plasma, serving as the essential first-line screening assay when a patient presents with unexplained easy bruising, prolonged bleeding from minor wounds, recurrent nosebleeds, or heavy menstrual bleeding. Physicians order this test alongside vWF functional activity (ristocetin cofactor) and factor VIII levels to diagnose or exclude von Willebrand Disease — the most common inherited bleeding disorder — particularly before surgical procedures, dental extractions, or when evaluating a personal or family history suggestive of a coagulopathy.
س: ما هو تحليل مستضد عامل فون ويلبراند ولماذا يُطلب؟
يقيس هذا الفحص كمية بروتين عامل فون ويلبراند في بلازما الدم، ويُعد أداة الفحص الأساسية لتشخيص مرض فون ويلبراند النزفي الوراثي، خاصة عند وجود كدمات سهلة أو نزيف مطول أو نزيف أنفي متكرر أو غزارة الطمث.
Q2: Do I need to fast before the vWF:Ag blood test and what medications can affect my results?
Yes, overnight fasting for 8 to 12 hours is preferred because lipemic (fatty) plasma can interfere with the chemiluminescent immunoassay detection system, and multiple common medications — including heparin, warfarin, direct oral anticoagulants, aspirin, and NSAIDs — can significantly alter measured vWF antigen levels. Heparin must be paused for 1 day and oral anticoagulants for 7 days before the blood draw, but only with the explicit written consent of your treating physician; never stop prescribed blood thinners independently. Additionally, estrogen-containing contraceptives, hormone replacement therapy, and pregnancy elevate vWF levels physiologically — inform your hematologist of all medications, supplements, and hormonal status at the time of testing to ensure accurate clinical interpretation.
س: هل يجب الصيام قبل تحليل vWF:Ag وما الأدوية المؤثرة على النتيجة؟
نعم، يُفضل الصيام طوال الليل لمدة 8-12 ساعة لأن الدهون في البلازما قد تتداخل مع دقة الفحص. يجب إيقاف الهيبارين ليوم واحد ومضادات التخثر الفموية لسبعة أيام ولكن فقط بعد استشارة الطبيب المعالج وأخذ موافقته الصريحة.
Q3: What do abnormal or low vWF Antigen test results mean for my health?
A low vWF:Ag level — typically below 30–50 IU/dL depending on blood group and laboratory reference range — indicates a quantitative deficiency of von Willebrand factor consistent with type 1 (partial deficiency) or type 3 (near-complete absence) von Willebrand Disease, requiring further subtyping with functional assays. Critically, blood group O individuals naturally have vWF levels approximately 25–30% lower than non-O individuals, so a borderline low result in a group O patient may be constitutional rather than pathological. Mildly reduced levels may cause only subtle bleeding tendencies, while severely depressed levels (<10 IU/dL) confer a risk of spontaneous joint and soft-tissue hemorrhage. Your hematologist will integrate your vWF:Ag result with vWF functional activity, factor VIII coagulant activity, and multimer analysis to classify the VWD subtype and formulate a personalized treatment plan — which may include desmopressin (DDAVP) trial, vWF-containing concentrates, or antifibrinolytic agents for minor procedures.
س: ماذا تعني النتائج المنخفضة لتحليل مستضد عامل فون ويلبراند؟
تدل المستويات المنخفضة (أقل من 30-50 وحدة دولية/ديسيلتر) على نقص كمي في عامل فون ويلبراند يتوافق مع النوع الأول أو الثالث من المرض. يجب الانتباه إلى أن أصحاب فصيلة الدم O لديهم مستويات أقل طبيعياً بنسبة 25-30%. سيقوم طبيب أمراض الدم بتفسير النتائج مع الفحوصات الوظيفية لتحديد خطة العلاج المناسبة.
⚖️ UAE Regulatory Compliance & Accreditation
Legal Framework:
- Federal Decree-Law No. 41 of 2024 (Art. 87) — Medical Laboratory Standards
- CDS Law 2026 — Minor Patient Consent & Guardian Authorization
- UAE PDPL — Personal Data Protection Law (Patient Data Privacy)
- DHA Facility License: 9834453
Quality Standards:
- ISO 9001:2015 Certified (Cert: INT/EGQ/2509DA/3139)
- DHA/MOHAP Standard Nomenclature Compliance
- CLIA Methodology Validated per CLSI H47-A2 Guidelines
- External Quality Assurance: UK NEQAS Blood Coagulation
2026 Medical Coding:
- ICD-10-CM: D68.0 (von Willebrand Disease)
- ICD-10-CM: D68.9 (Coagulation Defect, Unspecified)
- ICD-10-CM: Z14.8 (Genetic Carrier — VWD Susceptibility)
- LOINC: 6014-7 — vWF Ag [Mass/Vol] in PPP
📞 Book Your vWF:Ag Today
WhatsApp Insurance Verification • Home Collection 8 AM–11 PM • Same-Day Results
+971 54 548 8731
DHA Facility: 9834453 • ISO 9001:2015 • All Emirates Service Coverage
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