What's this test for?

This test is ideal if you're checking whether a past diphtheria vaccination actually gave you lasting protection. It's useful if you're not sure your immunity is still strong, are preparing for travel to an area where diphtheria still occurs, or work in a job (like healthcare or childcare) where you need to confirm your immune status. It's also helpful if you had an incomplete vaccine history and want to know where you stand.

What happens after I get my results?

Your results will show up in your account with your antibody level and an explanation of what counts as protective versus not protective. If your level is below the protective threshold, a simple next step is getting a diphtheria booster and then retesting a few weeks later to confirm your immunity rose. If your result is dangerously low and you've had a recent possible exposure, seek medical care right away. You can also download a standard lab report and track your antibody levels over time using the trends feature.

Who should consider this test?

This test is a good fit for anyone unsure about their diphtheria vaccine status, including adults who haven't had a booster in over 10 years, travelers heading to regions with lower vaccination coverage, and healthcare or childcare workers who need documented proof of immunity. It's also useful for people with incomplete or missing childhood vaccination records.

What symptoms indicate I may need this test?

Diphtheria immunity itself doesn't cause symptoms, so this test is less about symptoms and more about confirming protection before you're exposed. That said, if you've been near someone diagnosed with diphtheria, or you're experiencing a sore throat with a thick gray coating at the back of your throat, that's a sign to seek medical care immediately rather than wait on this test. Otherwise, this test is best used proactively, not reactively.

What is diphtheria immunity and why does it matter?

Diphtheria immunity means your body has enough antitoxoid antibodies to neutralize the toxin produced by the diphtheria bacteria if you're ever exposed. Without enough of these antibodies, an infection can lead to serious breathing problems and heart complications. Keeping your immunity current through vaccination and occasional testing is a simple way to stay protected, especially since diphtheria immunity fades over time and needs periodic boosters.

When will I get my results?

Results for this test are typically ready within about 7 days of your lab visit. Once processed, they'll be posted directly to your online account, where you can view your antibody level along with what it means.

What does low antibody level mean?

A level below 0.10 IU/mL means you likely don't have reliable protection against diphtheria anymore, even if you were vaccinated in the past. This usually happens because immunity naturally declines over years, especially if it's been a long time since your last booster. The practical next step is getting a diphtheria-containing booster (often combined as Tdap or Td) and retesting afterward to confirm your levels have risen.

What causes low diphtheria antibody levels?

The most common cause is simply time — antibody levels from childhood vaccines or old boosters gradually decline over the years. Missing a scheduled booster, having an incomplete vaccination series, or certain immune system conditions can also leave levels lower than expected. In most cases, a booster shot resolves the issue effectively.

How often should I retest?

If your results show good protection, retesting every 10 years alongside your routine booster schedule is generally enough. If you get a booster because your levels were low, retesting about 4-8 weeks later is a reasonable way to confirm your body responded. People in high-exposure jobs or frequent travelers may want to check more often.

What should I do if my results are abnormal?

If your antibody level comes back below the protective threshold, the most direct step is scheduling a diphtheria booster vaccine. After the booster, give your body a few weeks to build antibodies, then retest to confirm you're now protected. Keep a copy of your results and vaccination record handy, especially if you need proof of immunity for work or travel.

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.

Diphtheria Antibody Test - Confirm Vaccine Immunity

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

[email protected]

Diphtheria Immunity Antibody Blood Test

Diphtheria Antitoxoid, Endpoint Determination

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

What's this test for?

What happens after I get my results?

Who should consider this test?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Find a lab near you

Diphtheria Immunity Antibody Blood Test

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

1,000,000+ blood tests later, here's what our customers say