What's this test for?

This test is ideal if you're wondering whether you're still protected against diphtheria, especially if it's been years since your last vaccine or booster. It's also useful before travel, starting a new job, or school enrollment where proof of immunity is required. The test simply checks whether your body still has enough antibodies to fight off diphtheria if exposed.

What happens after I get my results?

Your results will show up in your account with a clear explanation of what counts as a protective antibody level. If your level is below 0.10 IU/mL, a simple next step is to talk with a vaccination provider about getting a booster shot. You can download a standard lab report from your account at any time, and if you retest in the future, you'll be able to track your immunity levels over time using the trends feature.

What symptoms indicate I may need this test?

Diphtheria immunity testing isn't about symptoms since the goal is to catch a problem before it happens. Instead, consider this test if you can't find your vaccination records, haven't had a booster in over 10 years, or work in healthcare, childcare, or travel to areas where diphtheria still occurs. It's also common to check this after recovering from an illness that may have affected your immune response.

How can I naturally support a healthy immune response?

While no natural remedy replaces vaccination for diphtheria protection, keeping your immune system strong helps your body respond well to any vaccine you do get. Eating a balanced diet with enough protein, vitamin C, vitamin D, and zinc supports normal immune function. Getting enough sleep, managing stress, and staying active also help your immune system work the way it should.

When will I get my results?

Results are typically ready within about 7 days of your sample being collected. You'll get a notification once your report is available, and you can log into your account to view and download it at that point. If you need results faster for a specific deadline like travel or school, it's a good idea to schedule your blood draw with plenty of buffer time.

Who should consider this test?

This test is a good fit for anyone unsure of their diphtheria immunity status, including adults who haven't had a booster recently, travelers heading to regions where diphtheria is more common, and people who need documented proof of immunity for work or school. It's also helpful if you're generally cautious about your vaccine protection and want to check rather than assume.

What does a low antitoxoid level mean?

A level below 0.10 IU/mL means your body may not have enough antibodies to fully protect you from diphtheria if you were exposed to it. This usually means it's time for a booster shot to bring your protection back up. It doesn't mean anything is wrong with you — antibody levels naturally decline over time after vaccination.

What causes low diphtheria antibody levels?

The most common cause is simply time — protection from diphtheria vaccines fades gradually over years, which is why boosters are recommended periodically. Some people also have a weaker antibody response to vaccination due to individual immune system differences. Missing a scheduled booster or having an incomplete vaccination series earlier in life can also lead to lower levels.

How often should I retest?

Most people only need to retest if it's been several years since their last booster or if they need updated proof of immunity for travel, work, or school. A common guideline is to check every 10 years, matching the typical booster schedule for adults. If you get a booster after a low result, retesting a few months later can confirm your levels came back up.

What should I do if my results are abnormal?

If your antibody level comes back below the protective threshold, the practical next step is scheduling a diphtheria booster (often given as part of the Tdap or Td vaccine). After the booster, your immune system typically needs a few weeks to build up protective antibody levels. You can retest later on to confirm your levels are back in the protective range.

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 Antitoxoid Test - Check 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 Antitoxoid Immunity Blood Test