What's this test for?

This test is ideal if you're experiencing reactions like hives, itching, swelling, or breathing trouble after taking penicillin V or related antibiotics. It checks whether your immune system has developed a specific allergic sensitivity to this medication. This is especially useful if you suspect a drug allergy but want confirmation before avoiding an important medication unnecessarily.

What happens after I get my results?

Your results will be available in your account, with a clear explanation of what a positive or negative result means for penicillin V sensitization. If your result is positive, a practical next step is to avoid penicillin V and related antibiotics and mention this sensitivity before any future medication use; if severe symptoms like difficulty breathing or swelling ever occur, seek emergency medical care right away. You can download the standard lab report directly from your account for your records. If you're ever retested, you can track changes in your results over time using the trends feature.

What symptoms indicate I may need this test?

Common signs include skin reactions like hives, rash, or itching, as well as swelling of the lips, face, or throat after taking penicillin V. Some people also experience wheezing, shortness of breath, or stomach upset shortly after a dose. If these symptoms have happened more than once after taking this antibiotic, it may be worth checking for a specific IgE sensitization.

When will I get my results?

Results are typically ready within about 7 days of your sample being processed at the lab. You'll get a notification once your report is ready to view in your account. The report will clearly show whether your result is positive or negative along with what that means.

Who should consider this test?

Anyone who has had a suspicious reaction after taking penicillin V, such as hives, swelling, or breathing difficulty, should consider this test. It's also useful for people who were told years ago they were allergic but never had it confirmed, since many people outgrow drug sensitivities over time. Knowing your true status helps you avoid unnecessarily skipping an effective and affordable antibiotic.

What is IgE and why does it matter?

IgE is a type of antibody your immune system makes when it reacts to something it sees as a threat, like a specific medication. When you have elevated IgE against penicillin V, it means your body has built a memory response that could trigger an allergic reaction the next time you're exposed. Checking this specific IgE helps clarify whether a past reaction was a true allergy or something else, like a side effect or unrelated illness.

What does a positive result mean?

A positive result means your immune system has produced antibodies against penicillin V, so you are sensitized and could have an allergic reaction if exposed again. This does not automatically mean you will react every time, but it's a signal to be cautious and avoid this antibiotic going forward. Keeping a record of this result and sharing it whenever you're prescribed medication can help prevent future reactions.

What does a negative result mean?

A negative result means no significant penicillin V-specific IgE was detected, which makes a true allergy to this specific antibiotic less likely. However, if you've had a strong reaction in the past, it's still smart to be cautious, since allergy testing isn't 100% conclusive on its own. Symptoms and history still matter alongside the lab result.

What causes a positive or false result?

A positive result usually reflects true past exposure and immune sensitization to penicillin V, often from previous antibiotic use. Cross-reactivity with similar antibiotic structures can sometimes cause a positive result even without direct exposure to this exact drug. Lab handling issues or very recent exposure can occasionally affect accuracy, which is why retesting after a suspected reaction can be helpful.

What should I do if my results are abnormal?

If your result comes back positive, the most practical step is to avoid penicillin V and closely related antibiotics going forward. Keep a copy of your results handy and mention this sensitivity anytime you need medication, whether at a pharmacy or urgent care visit. If you ever experience severe symptoms like throat swelling or trouble breathing after antibiotic exposure, treat it as an emergency and seek immediate medical care.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

Penicillin V Allergy Test - IgE Sensitization Check

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

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