Can Coffee Influence Your Allergy Test Results?

Wyndly Care Team
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What should you avoid before an allergy test?

Before an allergy test, avoid antihistamines, medications containing antihistamines, and certain asthma drugs for at least 7 days. Additionally, certain antidepressants should be stopped for at least 5 days before testing. Always consult your doctor for specific advice related to your medication.

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What Are the Different Types of Allergy Tests?

There are several types of allergy tests, each serving a unique purpose in identifying the cause of allergic reactions. They include skin tests, blood tests, and patch tests.

Skin Tests

In a skin test, a tiny amount of allergen, such as pollen, dust mites, or food, is applied to your skin using a small prick or scratch. The test monitors the skin's reaction to these allergens. This method is often used to test for environmental allergies, food allergies, and insect sting allergies.

Blood Tests

Blood tests, also known as serum IgE tests, involve taking a blood sample and testing it for specific antibodies called Immunoglobulin E (IgE) that your body may produce in response to allergens. Blood tests can be used when skin tests can't be performed or have inconclusive results.

Patch Tests

Patch testing is used primarily to identify allergens causing contact dermatitis, a skin reaction caused by direct contact with an allergen. In this test, patches coated with potential allergens are applied to the skin and left in place for 48 hours. Reactions are then assessed at 48 hours and often again at 72 to 96 hours.

How Does Allergy Testing Work?

Allergy testing works by exposing your body to potential allergens and observing the reaction. The type of test will dictate how this exposure occurs. With each test, the goal is to identify specific allergens causing your allergic symptoms.

Upon exposure to an allergen during a skin test, your body may produce a reaction, such as a bump or redness, indicating an allergy. Blood tests analyze the presence of allergy-specific antibodies in your blood. In a patch test, allergens are left on your skin for several days, and any resulting skin reaction indicates an allergy.

Whether you're looking to pinpoint a suspected pollen allergy or other allergen, the results of these tests can guide your allergist in creating a personalized treatment plan. After the test, you'll receive a report detailing which allergens caused a reaction. By understanding your allergy skin test results, you can better manage your allergies and reduce exposure to specific allergens.

What Medications Should I Stop Taking Before an Allergy Test?

Before undergoing an allergy test, it's crucial to stop taking certain medications that might interfere with the test results. While the specifics may vary depending on the test type, generally, you should avoid antihistamines, antidepressants, and some heartburn medications.

Medications to Avoid

Antihistamines are the primary group of medications to avoid before allergy testing. They can interfere with skin tests because they prevent the skin from reacting to allergens. Common over-the-counter (OTC) antihistamines include diphenhydramine (Benadryl), cetirizine (Zyrtec), and loratadine (Claritin). Prescription antihistamines may also need to be discontinued. Always consult with your allergist before halting any medication.

Medications That Should Not Be Stopped

It's important to note that not all medications should be stopped before an allergy test. For instance, continue using asthma medications, nasal steroids, and most prescription medications for conditions such as diabetes, high blood pressure, and heart disease. If you're uncertain about a specific medication, always consult with your healthcare provider or take our allergy quiz to better understand your symptoms and treatment options.

Can I Drink Coffee Before an Allergy Test?

No, it's generally recommended not to drink coffee or consume any caffeinated products before an allergy test. Caffeine can interfere with the results of the test, potentially leading to inaccurate findings.

Why No Caffeine Before an Allergy Test?

Caffeine is a stimulant that can affect the body's immune response, potentially skewing the results of an allergy test. It can also cause symptoms such as jitteriness or heart palpitations, which could be mistaken for an allergic reaction during a skin allergy test. Avoiding caffeine before testing ensures more accurate results.

Can I Have Coffee After an Allergy Test?

Yes, you can have coffee after an allergy test. Once the test is completed, caffeine will not affect the test results. However, if you experience any discomfort like jitteriness or heart palpitations, it might be best to wait until these symptoms subside. Remember, if you're unsure about anything related to your allergy test or if you're experiencing continuous allergy symptoms like fatigue, it's always best to consult with an allergist.

What Foods Should I Avoid Before an Allergy Test?

Before an allergy test, you should avoid certain foods and drinks that can interfere with the accuracy of the test results. These include foods and drinks containing antihistamines, caffeine, and certain food allergens.

Foods to Avoid

Avoiding certain foods can help ensure accurate results from your allergy test. These include foods that contain antihistamines or that you're known to have a reaction to. For example, if you're getting tested for a pollen allergy, you might want to avoid foods that cross-react with pollen, such as certain fruits, vegetables, and nuts.

Drinks to Avoid

Just as with certain foods, you should also avoid drinks that can interfere with your allergy test results. This mainly includes caffeinated drinks and alcohol. As mentioned earlier, caffeine can affect your body's immune response and skew the results of an allergy test. Alcohol, on the other hand, can increase blood flow to the skin, potentially leading to false positives in skin tests. It's best to stick to water and refrain from consuming alcohol for at least 24 hours before the test.

What Happens if You Test Positive for a Certain Allergen?

When you test positive for a specific allergen during an allergy test, it means your immune system reacts adversely to that substance. This reaction indicates that you are allergic to it. Your healthcare provider will interpret the results and develop a personalized treatment plan.

Upon testing positive, your healthcare provider will discuss the results with you. They will explain the extent of your allergies based on the severity of your skin's reaction during a skin allergy test or the level of specific antibodies in your blood test. This information will help you understand what triggers your allergic reactions.

Your healthcare provider will then advise you on the best course of treatment. This could range from avoiding the allergen, OTC or prescription medication, to more advanced options like immunotherapy. The Wyndly Allergy Test Sample Report provides a comprehensive overview of the allergens causing your symptoms, aiding in the formulation of a suitable treatment strategy.

What Are Some Uncommon Allergies That Can Affect Allergy Testing?

Even relatively unusual allergies can impact allergy testing results. A few less common allergies include reactions to certain preservatives, latex, cockroaches, and even certain types of wood. These can complicate the interpretation of allergy tests, as they may not be included in standard testing panels.

Allergy to certain preservatives, such as those found in processed foods or cosmetics, can trigger allergic reactions. These allergies are uncommon and may require specialized testing.

Another uncommon allergen is latex, often found in gloves, balloons, and certain medical devices. A skin allergy test can reveal a latex allergy. While not typically included in standard allergy tests, it can be added if a latex allergy is suspected.

Lastly, allergies to cockroaches and certain types of wood are also considered uncommon. These allergens are not typically included in standard tests but can be added if exposure is suspected and symptoms align. Understanding these uncommon allergies helps ensure a comprehensive approach to allergy testing.

What Are the Dos and Don’ts For an Allergy Test?

Preparing correctly for an allergy test and understanding what to expect during and after the procedure can help you get accurate results. Here are some key dos and don'ts when preparing for an allergy test.


  • Do consult with your doctor: Before the test, discuss your medical history, current symptoms, and medications with your doctor. This information helps in interpreting the test results correctly.
  • Do Follow Pre-Test Guidelines: Adhere to your doctor's instructions about stopping certain medications and avoiding specific foods or drinks before the test.
  • Do report your symptoms: After the test, report any symptoms or reactions to your doctor. This helps in accurate diagnosis and treatment planning.


  • Don't Ignore Pre-Test Instructions: Ignoring instructions about stopping certain medications or food can affect the accuracy of the test results.
  • Don't Hesitate to Ask Questions: If you're unsure about any part of the testing process, ask your healthcare provider for clarification.
  • Don't Neglect Aftercare: After the test, follow your doctor's advice on managing any reactions and scheduling follow-up visits.

By following these dos and don'ts, you can ensure a smoother allergy testing process and get the most accurate results, aiding in your journey towards effective allergy relief.

Live Allergy-Free with Wyndly

If you want long-term relief from your allergies, Wyndly can help. Our doctors will help you identify your allergy triggers and create a personalized treatment plan to get you the lifelong relief you deserve. Start by taking our quick online allergy assessment today!

Frequently Asked Questions

What can throw off an allergy test?

Certain factors can interfere with allergy test results. Taking antihistamines or certain other medications before the test can inhibit the body's allergic response, leading to inaccurate results. Also, skin conditions like eczema or psoriasis may skew skin test readings, making them less reliable.

Does coffee affect antihistamines?

There's no direct interaction between coffee and antihistamines. However, both can cause side effects like increased heart rate, nervousness, and sleep disturbances. Therefore, excessive coffee consumption while taking antihistamines might exacerbate these side effects. It's recommended to moderate your coffee intake when on these medications.

Is caffeine OK before allergy testing?

No, caffeine is not recommended before allergy testing. Caffeine has properties similar to certain antihistamines, which can interfere with the results of allergy skin tests. It's advised to avoid caffeine for at least 24 hours prior to your appointment to ensure accurate test results.

Does caffeine interfere with allergy testing?

No, caffeine does not interfere with allergy testing. However, certain medications, such as antihistamines and some antidepressants, can impact the results. It's crucial to inform your healthcare provider about all medications you're taking prior to undergoing an allergy test.

What should you not take before an allergy test?

Before an allergy test, you should avoid antihistamines, certain antidepressants, and some heartburn medications, as they can interfere with the test results. It's also advisable to stop using creams or lotions on your skin at least 24 hours before skin testing. Always consult your doctor for specific instructions.

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