ENA Quantrix 25 IgG at Dr. Essa Lab

ENA Quantrix 25 IgG at Dr. Essa Lab

The ENA Quantrix 25 IgG is a highly specialized, comprehensive multiplex diagnostic panel designed to detect and quantify IgG autoantibodies against 25 distinct extractable nuclear and cytoplasmic antigens in human serum. This advanced laboratory evaluation is a cornerstone in clinical immunology and rheumatology, providing critical diagnostic insights for patients suspected of having systemic autoimmune rheumatic diseases (SARD). Dr. Essa Laboratory & Diagnostic Centre, a pioneer in diagnostic services in Karachi, Pakistan, utilizes state-of-the-art line immunoassay (LIA) technology to perform this intricate analysis, ensuring unparalleled precision and clinical reliability.

Autoimmune disorders occur when the body’s immune system mistakenly identifies its own cellular components as foreign invaders, producing autoantibodies that target specific intracellular proteins and nucleic acids. The ENA Quantrix 25 IgG panel evaluates a broad spectrum of these autoantibodies simultaneously. This multiplex approach is highly superior to sequential single-antibody testing, as it provides a complete immunological profile of the patient in a single clinical run. This is particularly valuable because autoimmune diseases often present with overlapping clinical symptoms, making a comprehensive antibody profile essential for accurate differentiation and targeted therapeutic planning.

The anatomy evaluated by this test is cellular and molecular. It targets antigens located within the cell nucleus, nucleolus, and cytoplasm. The clinical importance of detecting these specific IgG autoantibodies lies in their high diagnostic specificity and prognostic value. For instance, certain antibodies are strongly associated with specific disease phenotypes, organ involvement (such as lupus nephritis or interstitial lung disease), and risk of systemic complications. By identifying the precise antibody profile, clinicians can establish an early diagnosis, predict disease progression, monitor disease activity, and customize immunosuppressive or immunomodulatory therapies to the patient’s unique biological profile.

Clinical Procedure: What to Expect

Patient Preparation

To ensure the highest accuracy of the ENA Quantrix 25 IgG test at Dr. Essa Lab, patients should follow these preparation guidelines:

• Fasting: Strict fasting is generally not required for this blood test. Patients can eat and drink normally prior to sample collection unless instructed otherwise by their referring physician.
• Medication History: Patients must inform the laboratory staff and their physician about all ongoing medications, particularly immunosuppressants, corticosteroids, or biologics, as these therapies can alter autoantibody levels in the blood.
• Biotin Supplements: High doses of biotin (Vitamin B7) can interfere with immunoassay-based laboratory technologies. It is recommended to avoid biotin supplements for at least 48 hours before the blood draw.
• Hydration: Staying well-hydrated by drinking plenty of water before the procedure makes venipuncture easier and more comfortable.

During the Procedure

The ENA Quantrix 25 IgG test is performed on a standard blood sample. The clinical procedure involves the following steps:

• Patient Positioning: The patient is seated comfortably in a phlebotomy chair, and the arm is positioned on a supportive rest.
• Site Selection and Cleansing: A certified phlebotomist at Dr. Essa Lab identifies a suitable vein, typically in the antecubital fossa (inner elbow). The skin is thoroughly cleansed with an antiseptic swab to prevent contamination.
• Sample Collection: A sterile, single-use needle is inserted into the vein to collect a small volume of blood into a serum separator tube (SST) or a red-top vacuum tube.
• Duration and Experience: The venipuncture process is highly efficient, typically taking less than two minutes. Patients may feel a minor, brief pinch as the needle enters the skin.
• Post-Collection Care: Once the sample is collected, the needle is withdrawn, and gentle pressure is applied to the site with a sterile cotton ball, followed by the application of an adhesive bandage.
• Laboratory Processing: The blood sample is allowed to clot and is then centrifuged to separate the serum. The serum is analyzed using automated line immunoassay platforms, where it is exposed to 25 purified recombinant or native antigens immobilized on test strips.

When is a ENA Quantrix 25 IgG Performed?

Systemic Lupus Erythematosus (SLE)

Physicians request the ENA Quantrix 25 IgG panel when a patient exhibits classic symptoms of Systemic Lupus Erythematosus, such as a malar (butterfly) rash, photosensitivity, unexplained joint pain, chronic fatigue, and recurrent low-grade fever. The test assists in confirming an SLE diagnosis by identifying highly specific markers like anti-double-stranded DNA (anti-dsDNA) and anti-Smith (anti-Sm) antibodies, which are crucial for distinguishing SLE from other connective tissue diseases.

Sjögren’s Syndrome

This panel is indicated for patients presenting with severe, chronic dryness of the eyes (keratoconjunctivitis sicca) and mouth (xerostomia), often accompanied by salivary gland swelling and joint pain. The detection of anti-SSA (Ro60), anti-Ro52, and anti-SSB (La) antibodies within the ENA 25 profile provides strong diagnostic evidence for Sjögren’s syndrome, helping clinicians differentiate primary Sjögren’s from secondary forms associated with other autoimmune conditions.

Systemic Sclerosis (Scleroderma)

When patients present with skin tightening (sclerodactyly), Raynaud’s phenomenon (color changes in fingers in response to cold), esophageal dysmotility, or unexplained pulmonary hypertension, systemic sclerosis is suspected. The ENA Quantrix 25 IgG panel detects specific markers such as anti-Scl-70 (topoisomerase I), anti-Centromere (Cenp A and Cenp B), and anti-PM-Scl100, which help classify the disease into diffuse or limited cutaneous systemic sclerosis and assess the risk of interstitial lung disease.

Mixed Connective Tissue Disease (MCTD)

Mixed Connective Tissue Disease is characterized by overlapping clinical features of SLE, systemic sclerosis, and polymyositis. Clinicians order this multiplex panel to detect high titers of anti-U1-RNP (specifically the 70 kDa, A, and C proteins) in the absence of other SARD-specific antibodies, which is the diagnostic hallmark of MCTD, allowing for early therapeutic intervention.

Inflammatory Myopathies (Polymyositis and Dermatomyositis)

Patients presenting with progressive, symmetrical proximal muscle weakness, difficulty climbing stairs, elevated muscle enzymes, or characteristic skin rashes (such as Gottron’s papules or a heliotrope rash) are evaluated for inflammatory myopathies. The ENA Quantrix 25 IgG panel screens for key myositis-specific autoantibodies, including anti-Jo-1, anti-PL-7, anti-PL-12, anti-EJ, anti-OJ, anti-SRP, and anti-Mi-2, assisting in precise diagnosis and risk stratification for interstitial lung disease.

What Does a ENA Quantrix 25 IgG Detect?

The ENA Quantrix 25 IgG panel is designed to detect a highly specific array of autoantibodies. Clinical findings from this panel include:

• Anti-dsDNA IgG: Strongly associated with active Systemic Lupus Erythematosus (SLE) and a key marker for monitoring lupus nephritis risk.
• Anti-Nucleosome IgG: Highly sensitive marker for SLE, often correlating with renal involvement and disease activity.
• Anti-Histone IgG: A primary diagnostic marker for drug-induced lupus erythematosus.
• Anti-Sm IgG: Highly specific for SLE; its presence confirms the diagnosis of lupus even in the absence of other markers.
• Anti-PCNA IgG: Associated with a subset of SLE patients, often linked to proliferative glomerulonephritis.
• Anti-Ribosomal P-protein IgG: Highly specific for SLE, frequently associated with neuropsychiatric lupus and active disease.
• Anti-nRNP/Sm IgG: Indicates connective tissue disease; high titers are characteristic of Mixed Connective Tissue Disease (MCTD).
• Anti-U1-RNP IgG: Essential for the diagnosis of MCTD when present in high concentrations without other specific antibodies.
• Anti-SS-A / Ro60 IgG: Frequently detected in Sjögren’s syndrome, SLE, and cutaneous lupus.
• Anti-Ro52 IgG: Associated with Sjögren’s syndrome, systemic sclerosis, inflammatory myopathies, and neonatal lupus.
• Anti-SS-B / La IgG: Strongly associated with Sjögren’s syndrome and SLE; usually co-exists with anti-SSA antibodies.
• Anti-Scl-70 IgG: Highly specific for diffuse cutaneous systemic sclerosis and strongly predictive of pulmonary fibrosis.
• Anti-PM-Scl100 IgG: Found in PM/Scl overlap syndrome, characterized by features of both polymyositis and systemic sclerosis.
• Anti-Jo-1 IgG: The most common anti-synthetase antibody, associated with polymyositis, interstitial lung disease, and arthritis.
• Anti-PL-7 IgG: An anti-synthetase antibody associated with myositis and a high prevalence of interstitial lung disease.
• Anti-PL-12 IgG: Associated with anti-synthetase syndrome, often presenting with severe lung involvement and mild muscle symptoms.
• Anti-EJ IgG: Associated with anti-synthetase syndrome, characterized by interstitial lung disease and myositis.
• Anti-OJ IgG: A rare anti-synthetase antibody linked to inflammatory myopathy and lung disease.
• Anti-SRP IgG: Associated with severe, necrotizing autoimmune myopathy with poor response to standard therapies.
• Anti-Mi-2 IgG: Highly specific for classic dermatomyositis, generally associated with a favorable response to treatment.
• Anti-Ku IgG: Associated with overlap syndromes involving systemic sclerosis, polymyositis, and SLE.
• Anti-Cenp A IgG: Highly specific for limited cutaneous systemic sclerosis (formerly CREST syndrome).
• Anti-Cenp B IgG: Strongly associated with limited systemic sclerosis and predictive of a lower risk of severe lung involvement.
• Anti-DFS70 IgG: Often found in healthy individuals or non-systemic autoimmune conditions; a positive result can help rule out SARD when other antibodies are negative.
• Negative Profile: Indicates the absence of detectable IgG autoantibodies against the 25 specific antigens, reducing the likelihood of an active systemic autoimmune rheumatic disease.

Turnaround Time and Report Access at Dr. Essa Lab

At Dr. Essa Laboratory & Diagnostic Centre, we understand the clinical urgency associated with autoimmune diagnostics. The ENA Quantrix 25 IgG is a complex multiplex assay requiring meticulous quality control and expert interpretation by our consultant immunologists. The turnaround time for this specialized panel is typically 3 to 5 working days. Once the analysis is complete and verified, reports are immediately uploaded to our secure digital database. Patients and referring physicians can easily access, view, and download the highly detailed, quantitative reports online through the Dr. Essa Lab official website or mobile application. Physical copies of the report are also available for collection at any of our conveniently located diagnostic centers across Karachi and other major cities.

ENA Quantrix 25 IgG Findings Overview

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Anti-dsDNA IgG	Negative	Positive (Highly specific for SLE, risk of lupus nephritis)
Anti-Sm IgG	Negative	Positive (Highly specific diagnostic marker for SLE)
Anti-U1-RNP IgG	Negative	Positive (Diagnostic marker for Mixed Connective Tissue Disease)
Anti-SS-A (Ro60) / Anti-Ro52 IgG	Negative	Positive (Sjögren’s syndrome, SLE, risk of congenital heart block)
Anti-SS-B (La) IgG	Negative	Positive (Sjögren’s syndrome, SLE)
Anti-Scl-70 IgG	Negative	Positive (Diffuse systemic sclerosis, high risk of interstitial lung disease)
Anti-Jo-1 IgG	Negative	Positive (Antisynthetase syndrome, polymyositis, interstitial lung disease)
Anti-Centromere (Cenp A/B) IgG	Negative	Positive (Limited cutaneous systemic sclerosis, CREST syndrome)
Anti-Ribosomal P-protein IgG	Negative	Positive (Neuropsychiatric lupus, active SLE)
Anti-Histone IgG	Negative	Positive (Drug-induced lupus erythematosus)

Note: Diagnostic findings should always be interpreted by a qualified healthcare professional together with the patient’s symptoms, medical history, physical examination, laboratory investigations, previous imaging studies, and other relevant clinical information. Additional investigations or specialist consultation may be recommended depending on the findings.

Why Choose Dr. Essa Lab for ENA Quantrix 25 IgG?

• Experienced Healthcare Professionals: Our laboratory is led by highly qualified consultant pathologists and immunologists who oversee all testing procedures.
• ISO 15189 Certified: Dr. Essa Lab adheres to international quality standards, ensuring the highest level of diagnostic accuracy and reliability.
• Advanced Multiplex Technology: We utilize state-of-the-art automated line immunoassay platforms to perform the ENA Quantrix 25 IgG panel.
• Comprehensive Reporting: Our reports provide detailed, clear, and quantitative results for all 25 antigens to assist clinicians in precise decision-making.
• Convenient Home Sampling: Patients can avail of our professional home sample collection services across Karachi for maximum comfort.
• Easy Online Access: Secure online portal and mobile app allow patients to access their diagnostic reports anytime, anywhere.
• Established Legacy: Serving patients since 1987, Dr. Essa Lab is one of the most trusted diagnostic names in Pakistan.
• Patient-Focused Care: We prioritize patient comfort, safety, and confidentiality at every step of the diagnostic journey.