Food Allergens Profile (LHR) at Dr. Essa Lab

Food Allergens Profile (LHR) at Dr. Essa Lab

The Food Allergens Profile (LHR) at Dr. Essa Lab is a comprehensive, state-of-the-art diagnostic blood test designed to identify specific IgE-mediated food hypersensitivities. Food allergies represent a significant public health concern, affecting millions of individuals globally. When an individual with a food allergy consumes a triggering substance, their immune system mistakenly identifies specific proteins in that food as harmful pathogens. In response, the immune system synthesizes Immunoglobulin E (IgE) antibodies tailored to target those specific food proteins. These IgE antibodies bind to mast cells in tissues and basophils in the blood. Upon subsequent exposure to the allergen, the allergen cross-links the IgE on these cells, triggering the rapid release of chemical mediators such as histamine, prostaglandins, and leukotrienes. This physiological cascade results in the clinical symptoms of an allergic reaction, ranging from mild pruritus and urticaria to life-threatening systemic anaphylaxis.

By utilizing advanced laboratory technologies, the Food Allergens Profile (LHR) at Dr. Essa Lab measures the concentration of allergen-specific IgE antibodies in a patient’s blood serum. This quantitative and semi-quantitative assessment provides clinicians with invaluable objective data to differentiate between true IgE-mediated food allergies, non-IgE-mediated food hypersensitivities, and food intolerances. Understanding the precise molecular triggers is essential for developing targeted allergen avoidance strategies, prescribing appropriate emergency medications like epinephrine auto-injectors, and preventing unnecessary, overly restrictive diets that can lead to nutritional deficiencies. This diagnostic profile evaluates a wide range of common dietary allergens, including proteins from dairy, eggs, grains, nuts, and seafood, offering a detailed immunological map of the patient’s reactivity.

Clinical Procedure: What to Expect

Patient Preparation

Proper preparation is key to ensuring a smooth sample collection process and obtaining accurate diagnostic results. Patients undergoing the Food Allergens Profile (LHR) at Dr. Essa Lab should observe the following guidelines:

• No Fasting Required: Unlike metabolic or lipid panels, fasting is generally not required for a food allergen specific IgE blood test. Patients can eat and drink normally prior to the blood draw.
• Medication Review: Inform your prescribing physician and the laboratory staff about all medications, supplements, and herbal remedies you are currently taking. While routine antihistamines do not interfere with serum specific IgE tests (unlike skin prick testing), certain systemic corticosteroids or immunosuppressive therapies may modulate overall immune responses and should be discussed with your doctor.
• Hydration: Drink plenty of water before the procedure. Being well-hydrated increases blood volume and makes veins more accessible, facilitating a quicker and more comfortable venipuncture.
• Wear Comfortable Clothing: Wear a short-sleeved shirt or clothing with sleeves that can be easily rolled up above the elbow to allow clear access to the cubital fossa.
• Stay Calm and Relaxed: Anxiety can cause temporary vasoconstriction. If you have a history of dizziness or fainting during blood draws, inform the phlebotomist beforehand so they can perform the procedure while you are in a recumbent position.

During the Procedure

The collection of a blood sample for the Food Allergens Profile (LHR) at Dr. Essa Lab is a routine, safe, and highly standardized procedure performed by experienced phlebotomists. The entire process typically takes less than ten minutes and follows strict clinical protocols:

First, the patient is comfortably seated, and the phlebotomist identifies the optimal vein, usually located in the antecubital space of the arm. The skin over the selected vein is thoroughly cleansed with an antiseptic solution (such as 70% isopropyl alcohol) to prevent any microbial contamination and allowed to air dry. A sterile elastic tourniquet is applied a few inches above the puncture site to temporarily restrict venous blood flow, making the vein more prominent and palpable.

Using a sterile, single-use needle attached to a vacuum collection tube (typically a serum separator tube or SST), the phlebotomist gently inserts the needle into the vein. Patients may feel a brief, mild pinch or stinging sensation at the moment of insertion. Once the blood begins to flow into the tube, the tourniquet is released to restore normal circulation. After the required volume of blood is collected, the needle is carefully withdrawn, and immediate, gentle pressure is applied to the puncture site with a sterile cotton ball or gauze pad to promote hemostasis. A small adhesive bandage is then applied to keep the site clean. The collected blood sample is labeled immediately with the patient’s unique identification details to ensure absolute traceability, and it is then sent to the immunology department for advanced analysis.

When is a Food Allergens Profile (LHR) Performed?

Investigation of Suspected IgE-Mediated Food Allergy

Physicians request the Food Allergens Profile (LHR) when a patient presents with immediate hypersensitivity reactions occurring within minutes to a few hours after consuming specific foods. These acute reactions are characterized by symptoms such as localized or generalized urticaria (hives), angioedema (swelling of the lips, tongue, face, or periorbital tissues), acute pruritus, and flushing. By measuring specific IgE levels, this profile helps clinicians confirm whether these acute, potentially dangerous symptoms are driven by an immunological mechanism directed against specific food proteins, allowing for a definitive diagnosis and targeted intervention.

Evaluation of Chronic Atopic Conditions

Chronic inflammatory skin and respiratory conditions, such as moderate-to-severe atopic dermatitis (eczema), persistent asthma, and allergic rhinitis, are frequently exacerbated by underlying food allergies, particularly in pediatric populations. When standard dermatological or respiratory therapies fail to provide adequate control, clinicians utilize this comprehensive panel to identify silent food triggers. Pinpointing and eliminating these offending dietary allergens can significantly reduce systemic inflammatory load, improve skin barrier integrity, decrease asthma exacerbations, and enhance the patient’s overall quality of life.

Unexplained Gastrointestinal Symptoms

Persistent or recurrent gastrointestinal distress can be a manifestation of food allergies. Symptoms such as nausea, vomiting, abdominal pain, cramping, bloating, and chronic diarrhea that occur consistently after meals warrant investigation. While some gastrointestinal issues are due to non-allergic intolerances (such as lactose intolerance), an IgE-mediated food allergy must be ruled out, especially when symptoms are accompanied by extraintestinal manifestations. The Food Allergens Profile (LHR) assists gastroenterologists in identifying or excluding IgE-mediated pathways in these complex clinical presentations.

Risk Assessment for Severe Systemic Reactions

Anaphylaxis is a severe, life-threatening systemic allergic reaction that requires immediate medical emergency intervention. It can involve multiple organ systems, causing bronchospasm, laryngeal edema, severe hypotension (anaphylactic shock), cardiac arrhythmias, and loss of consciousness. For patients who have experienced unexplained systemic episodes or severe reactions after consuming mixed meals, this profile is critical. It helps identify the specific culprit allergen, allowing the healthcare team to establish a robust emergency action plan, including the prescription of epinephrine auto-injectors and comprehensive allergen avoidance education.

Monitoring Tolerance and Allergy Resolution

Many childhood food allergies, particularly those to milk, egg, soy, and wheat, are outgrown over time as the immune system develops oral tolerance. Conversely, allergies to peanuts, tree nuts, and seafood tend to persist throughout life. Pediatricians and allergists perform serial Food Allergens Profile (LHR) testing at regular intervals (typically every 12 to 24 months) to monitor changes in specific IgE titers. A progressive decline in specific IgE levels over time is a strong clinical indicator that the patient may be developing tolerance, helping clinicians determine the safest time to perform a supervised oral food challenge.

What Does a Food Allergens Profile (LHR) Detect?

The Food Allergens Profile (LHR) at Dr. Essa Lab is designed to detect and quantify allergen-specific IgE antibodies against a comprehensive spectrum of common dietary triggers. The profile evaluates sensitization to the following specific allergens and allergen groups:

• Cow’s Milk Proteins: Detects sensitization to major milk proteins such as casein, alpha-lactalbumin, and beta-lactoglobulin, which are primary triggers in pediatric allergies.
• Egg White: Measures IgE antibodies against ovalbumin, ovomucoid, and conalbumin, which are highly allergenic proteins found in egg whites.
• Egg Yolk: Evaluates specific sensitivity to proteins present in the yolk, which can sometimes trigger reactions independently of egg white.
• Wheat: Identifies IgE-mediated reactivity to wheat proteins, helping differentiate wheat allergy from non-celiac gluten sensitivity and celiac disease.
• Gluten: Specifically measures antibodies against the gluten protein fraction found in wheat, barley, and rye.
• Soybean: Detects sensitization to soy proteins, a common ingredient in many processed foods and infant formulas.
• Peanut: Evaluates IgE levels against peanut storage proteins (such as Ara h 1, Ara h 2, Ara h 3), which are associated with severe, persistent, and systemic allergic reactions.
• Hazelnut: Identifies sensitivity to this common tree nut, which frequently cross-reacts with birch pollen.
• Almond: Measures specific IgE antibodies to almond proteins, helping manage tree nut avoidance strategies.
• Walnut: Evaluates reactivity to walnut proteins, another frequent cause of severe systemic allergic reactions.
• Cashew: Detects IgE antibodies to cashew proteins, which are known to cause highly potent allergic responses.
• Pistachio: Evaluates sensitivity to pistachio, which shares high cross-reactivity with cashew.
• Brazil Nut: Measures specific IgE antibodies to identify sensitization to this specific tree nut.
• Codfish: Identifies IgE-mediated allergy to parvalbumin proteins in codfish, a major representative of finned fish allergies.
• Salmon: Measures specific IgE antibodies to salmon, helping determine if fish allergy is limited to specific species or broad.
• Tuna: Evaluates sensitivity to tuna proteins, another common finned fish allergen.
• Shrimp: Detects IgE antibodies to tropomyosin, the primary muscle protein responsible for severe shellfish allergies.
• Crab: Evaluates reactivity to crab proteins, helping map crustacean hypersensitivity.
• Lobster: Measures specific IgE antibodies to lobster, completing the evaluation for major crustacean allergens.
• Sesame Seed: Identifies sensitization to sesame proteins, an increasingly recognized allergen in global diets.
• Mustard: Measures IgE antibodies to mustard seed proteins, which can cause severe immediate hypersensitivity.
• Celery: Detects sensitivity to celery, a common trigger for oral allergy syndrome and systemic reactions in some regions.
• Peach: Evaluates IgE antibodies to lipid transfer proteins (LTP) in peach, often linked to severe fruit allergies.
• Apple: Measures reactivity to apple proteins, which frequently cross-react with birch pollen (oral allergy syndrome).
• Tomato: Identifies IgE-mediated sensitivity to tomato proteins.
• Potato: Evaluates specific IgE antibodies to potato proteins.
• Yeast: Measures IgE-mediated reactivity to Saccharomyces cerevisiae and other common yeasts.
• Total IgE: Quantifies the overall concentration of IgE antibodies in the blood, providing a baseline of the patient’s general allergic state.

Turnaround Time and Report Access at Dr. Essa Lab

At Dr. Essa Lab, we understand that waiting for diagnostic results can be an anxious time for patients and their families. The Food Allergens Profile (LHR) is processed in our highly automated clinical immunology department using advanced chemiluminescent immunoassay (CLIA) or enzyme-linked immunosorbent assay (ELISA) platforms. These technologies ensure rapid throughput without compromising on analytical precision.

The turnaround time for the Food Allergens Profile (LHR) is typically 24 to 48 hours from the time of sample collection. Once the analysis is complete, the results undergo a rigorous multi-stage verification process by our qualified clinical pathologists to ensure absolute accuracy. Patients and referring physicians can access the diagnostic reports conveniently online through the official Dr. Essa Lab website or dedicated mobile application. Additionally, physical copies of the reports can be collected from any of our conveniently located diagnostic centers across Karachi and other major cities. Automated SMS notifications are sent to patients as soon as their reports are ready for download.

Food Allergens Profile (LHR) Findings Overview

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Total IgE Level	Within age-specific reference ranges (typically < 100 kU/L for adults)	Elevated levels indicating a generalized atopic state, parasitic infection, or active allergic response.
Specific IgE: Egg White	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Low, Moderate, High, or Very High sensitization to egg white proteins).
Specific IgE: Cow’s Milk	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Sensitization to milk proteins, indicating risk of dairy allergy).
Specific IgE: Wheat	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Sensitization to wheat proteins, suggesting potential wheat allergy).
Specific IgE: Peanut	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Sensitization to peanut proteins, indicating risk of severe reactions).
Specific IgE: Soy	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Sensitization to soy proteins, common in pediatric allergy panels).
Specific IgE: Seafood (Shrimp/Cod)	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Sensitization to shellfish or finned fish, often associated with persistent allergy).
Specific IgE: Tree Nuts (Almond/Walnut)	< 0.35 kUA/L (Class 0: Absent or Undetectable)	≥ 0.35 kUA/L (Classes 1 to 6: Sensitization to tree nuts, requiring strict dietary avoidance).

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 Food Allergens Profile (LHR)?

• Experienced Healthcare Professionals: Our clinical laboratories are staffed by highly qualified pathologists, immunologists, and technologists specializing in allergy diagnostics.
• Patient-Focused Care: We prioritize patient comfort, safety, and clear communication throughout the testing process.
• Quality Diagnostic Services: Dr. Essa Lab is committed to maintaining international standards of quality control and analytical precision in all laboratory investigations.
• Professional Reporting: We provide comprehensive, structured, and easy-to-understand reports with detailed quantitative values and clinical classification ranges.
• Modern Diagnostic Approach: Our facilities are equipped with advanced, fully automated immunoassay analyzers that ensure highly sensitive and specific IgE detection.
• Comfortable Environment: Our diagnostic centers and collection points offer a clean, sterile, and welcoming environment for patients of all ages.
• Convenient Location: With an extensive network of branches across Karachi and other major cities, accessing our diagnostic services is convenient and hassle-free.
• Commitment to Accurate Diagnosis: We employ rigorous internal quality controls and participate in external quality assurance programs to guarantee the reliability of every test result.