Serum or Plasma Immunoassay for Ragweed-Specific IgE (Total or Specific)
This blood test measures your immune system’s response to ragweed pollen by detecting the presence of Immunoglobulin E (IgE) antibodies specific to ragweed. IgE is involved in allergic reactions and helps identify potential sensitivities.
["Helps diagnose ragweed allergies and guide allergy management."]
Key facts at a glance
- LOINC
- 7646-3
- Short code
- Common Ragweed IgG Qn
- Synonyms
- Common Ragweed IgG Qn
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters for Allergies
Ragweed is a common allergen that triggers seasonal allergies, particularly in late summer and fall. This test helps determine if your immune system reacts to ragweed pollen, which can lead to symptoms like sneezing, itching, or skin rashes. It’s often used alongside other allergy tests to create a full picture of your sensitivities.
How the Test Works
A small blood sample is taken to detect ragweed-specific IgE antibodies. The test uses immunoassay technology to measure these antibodies, which are produced by your immune system in response to ragweed exposure. This helps healthcare providers assess whether ragweed is a trigger for your symptoms.
When You Might Need This Test
Your doctor may recommend this test if you experience allergic symptoms during ragweed season, such as itchy eyes, runny nose, or skin reactions. It may also be used before allergy immunotherapy (like allergy shots) to confirm a ragweed allergy before starting treatment.
Preparation and Sample Collection
No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a few drops of blood. The test is typically done in a doctor’s office or a lab. If you’re on blood-thinning medication, let your healthcare provider know before the test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results indicate an allergic reaction to ragweed pollen, which can guide treatment plans such as avoiding exposure, using antihistamines, or undergoing allergy immunotherapy. It’s important to note that a positive test does not guarantee an allergic reaction will occur every time you’re exposed, but it confirms your immune system is sensitized. False positives can occur, so results should be interpreted by a healthcare provider in the context of your symptoms and medical history.
Short name
Ragweed IgE Test
Frequently asked questions
What Does a Positive Result Mean?
Can This Test Be Used for Allergy Shots?
How Long Does It Take to Get Results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy