Allergy, Crab Test: Booking, Price, and Results
About Allergy, Crab Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Crab-Specific IgE Test, Crab IgE Antibody Test, Crab Allergen Test, f23 IgE Test |
| Sample Type | Serum (venous blood) |
| Fasting Required | No fasting required |
| Report Time | 3 days |
| Recommended For | All ages; particularly adults with suspected shellfish allergy |
| Price | Starting at ₹1,300 |
What Is an Allergy, Crab Test?
The allergy, crab test measures the level of crab-specific IgE (immunoglobulin E) antibodies in your blood. IgE antibodies are proteins produced by the immune system when it treats a substance, in this case crab proteins, as a threat. The test is also known as the crab-specific IgE test, crab IgE antibody test, crab allergen test, or f23 IgE test. A small blood sample is collected from a vein in your arm and sent to the laboratory for analysis.
What Does an Allergy, Crab Test Measure?
The test measures one key marker in your blood. Here is what it measures:
| Parameter | What It Measures |
|---|---|
| Crab-specific IgE antibodies | The level of IgE antibodies directed at crab proteins, indicating whether your immune system has become sensitised to crab |
The main protein responsible for crab allergy is tropomyosin, a muscle protein found in crustaceans. When your immune system produces IgE antibodies against this protein, it can trigger allergic reactions on exposure to crab. Higher antibody levels generally correspond to a greater likelihood of a clinical allergic reaction.
Why Is an Allergy, Crab Test Done?
The allergy, crab test is ordered when a person experiences reactions after eating crab or foods containing crab. It helps confirm whether those reactions are caused by an IgE-mediated allergy.
Common Symptoms That May Require This Test
Your doctor may recommend this test if you experience any of the following after consuming crab:
- Tingling or swelling of the lips, tongue, or throat
- Stomach pain, nausea, vomiting, or diarrhoea
- Skin symptoms such as hives or worsening of eczema
- Wheezing, coughing, or shortness of breath
- Chest tightness
- Dizziness, weak pulse, or fainting
Conditions This Test Can Help Detect
The allergy, crab test helps identify or support the diagnosis of the following conditions:
- Crab allergy (IgE-mediated sensitivity to crab proteins)
- Shellfish allergy in general, as crab belongs to the crustacean group (which also includes shrimp and lobster), responsible for the highest number of shellfish allergic reactions
- Risk of anaphylaxis, a severe whole-body allergic reaction that can occur rapidly following exposure to the allergen
How to Prepare and What to Expect
No special preparation is needed for this test. The process is straightforward and takes only a few minutes.
Do You Need to Fast?
No, fasting is not required before an allergy, crab test. You can eat and drink normally before your appointment. Recent consumption of crab will also not affect the result, as the test measures antibodies already present in your bloodstream. However, always follow the instructions provided by the doctor or laboratory.
Practical Tips Before Your Test
Keep the following in mind before you go for sample collection:
- Bring a detailed clinical history including your symptoms, previous test results, and any known allergies, as this is required for the test
- Inform the doctor about all medications and supplements you are currently taking
- Let the technician know if you have recently undergone immunotherapy treatment, as this may influence results
- Wear a short-sleeved or loose-sleeved top to allow easy access to the arm
Step-by-Step Procedure
- The phlebotomist wraps an elastic band around your upper arm to make your veins more visible.
- You may be asked to make a fist to help the vein fill with blood.
- The skin over the vein is cleaned with an antiseptic wipe.
- A small needle is inserted, and a blood sample of approximately 3 ml is drawn into a special collection tube.
- The needle is removed, and a small cotton pad is placed over the site to stop any bleeding.
- The labelled sample is refrigerated and sent to the laboratory for analysis using the FEIA (fluorescent enzyme immunoassay) method.
Factors That Can Affect Accuracy
The following factors may influence the reliability of your results:
- Very high total IgE levels in the blood can cause false-positive readings
- Recent immunotherapy treatment may alter IgE antibody levels
- Improper sample storage or handling during transport
- Timing of allergen exposure relative to the test date
Understanding Your Allergy, Crab Test Results
Your doctor will review your results alongside your symptoms and medical history. A result alone is not enough to confirm or rule out an allergy. The table below shows the general reference ranges:
| Class | IgE Level (kU/L) | Interpretation |
|---|---|---|
| 0 | <0.10 | Negative |
| 0/1 | 0.10-0.34 | Borderline/equivocal |
| 1 | 0.35-0.69 | Equivocal |
| 2 | 0.70-3.49 | Positive |
| 3 | 3.50-17.4 | Positive |
| 4 | 17.5-49.9 | Strongly positive |
| 5 | 50.0-99.9 | Strongly positive |
| 6 | > or =100 | Strongly positive |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Some individuals may have measurable IgE antibody levels without experiencing any noticeable symptoms. These results must always be reviewed alongside your clinical history and symptoms. Tropomyosin, the main crab allergen, is also found in house dust mites and cockroaches. This can occasionally lead to cross-reactive IgE results, where sensitivity to one organism influences readings for another. Your doctor will account for this when interpreting your results.
How to Maintain Healthy Levels
If your results point to a crab allergy, the following general steps can help you stay safe:
- Avoid crab and consider avoiding other crustaceans such as shrimp, lobster, and prawns, as cross-reactivity is common within this group.
- Read food labels carefully and inform restaurant staff about your allergy before ordering.
- Discuss an emergency action plan with your doctor, particularly regarding what steps to take in the event of accidental exposure.
Lupin Diagnostics Allergy, Crab Test Price and Home Collection
The allergy, crab test cost at Lupin Diagnostics starts at ₹1,300, with home collection available across cities. The indicative city-wise prices are listed below:
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 1300 |
| CHENNAI | 1300 |
| HYDERABAD | 1300 |
| KOLKATA | 1300 |
| NAVI MUMBAI | 1300 |
| PUNE | 1300 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps for allergy, crab test online booking:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
The allergy crab test home collection is available across cities through Lupin Diagnostics. A trained phlebotomist visits your home at your chosen time to collect the blood sample. All samples are processed in NABL-accredited laboratories, and your digital report is shared via email or WhatsApp once ready.
Frequently Asked Questions
The allergy, crab test detects crab-specific IgE antibodies in your blood. It helps confirm whether your immune system is reacting to proteins found in crab. Your doctor uses the result alongside your symptoms and history to assess whether you have a crab allergy.
No fasting is needed. You can eat and drink normally before the test. No dietary changes or medication adjustments are required unless your doctor has specifically advised otherwise. However, always follow instructions provided by your doctor.
Yes, eating crab before the test will not affect your results. The test measures IgE antibodies that are already present in your bloodstream, not what you have eaten recently.
If you experience hives, swelling of the lips or throat, stomach upset, shortness of breath, or dizziness after eating crab or dishes containing crab, your doctor may recommend this test. A detailed clinical history helps the laboratory interpret your results accurately.
Not necessarily, but it is common. Most people who are allergic to one type of crustacean, such as crab, are also sensitive to others like shrimp or lobster. Your doctor may recommend further allergy testing to check for reactions to related shellfish.
Unlike some childhood food allergies, shellfish allergies, including crab allergies, are typically lifelong. The allergy does not tend to resolve on its own over time. Regular follow-up with your doctor is advisable if you have a confirmed shellfish allergy.
Reports are typically ready within 3 days of sample collection at Lupin Diagnostics. Your report will be shared digitally via email or WhatsApp once available.
Allergy, Crab Test: Booking, Price, and Results
