What's this test for?

This test is ideal if you're experiencing unexplained fatigue, muscle weakness, tingling in your hands or feet, or confusion that could point to a vitamin B1 (thiamine) shortage. It's especially helpful if you drink alcohol regularly, have had gastric bypass surgery, or deal with a chronic illness that affects how your body absorbs nutrients. Checking your thiamine level can help explain these symptoms and guide simple diet or supplement changes.

What happens after I get my results?

Your results will show up in your account with your thiamine level plus the normal range so you can see exactly where you stand. If your level is low, next steps are usually straightforward, like adding more thiamine-rich foods, taking a supplement, or cutting back on alcohol, along with a retest in a few months to confirm improvement. If your result is severely low or you have serious symptoms like confusion or trouble walking, seek medical care right away. You can download the full lab report anytime and use the trends feature to track your thiamine level over time.

Who should consider this test?

People who drink alcohol heavily, have had weight-loss or gastric bypass surgery, or live with a chronic digestive condition are good candidates for this test since these situations make it harder for the body to absorb thiamine. It's also useful for anyone with ongoing fatigue, nerve tingling, or muscle weakness that hasn't been explained by other causes. Older adults and people with poor overall nutrition may also benefit from checking their level.

What symptoms indicate I may need this test?

Common signs of low thiamine include constant tiredness, muscle weakness, numbness or tingling in the hands and feet, poor appetite, and trouble concentrating. In more serious cases, people may notice confusion, rapid heartbeat, or difficulty walking. If any of these symptoms sound familiar, especially alongside heavy alcohol use or recent weight-loss surgery, this test can help find out if thiamine is the cause.

How can I naturally support healthy thiamine levels?

You can boost your thiamine intake by eating more whole grains, pork, legumes, nuts, and seeds, which are all natural sources of the vitamin. Cutting back on alcohol helps your body absorb and store thiamine more effectively. Cooking foods gently rather than boiling them for a long time also helps preserve thiamine content, since it's sensitive to heat and water.

When will I get my results?

Results are typically ready within about 7 days of your lab visit. You'll get a notification as soon as your report is available in your account, where you can view your thiamine level alongside the reference range and download the full report.

What does low thiamine mean?

A low thiamine result means your body doesn't have enough of this vitamin to support normal nerve and energy function, which can lead to fatigue, muscle weakness, or nerve tingling. If left unaddressed for a long time, severe deficiency can cause a condition called beriberi, which affects the heart and nervous system. Adding thiamine-rich foods or a supplement and reducing alcohol intake are practical first steps, with a retest to check progress.

What causes low thiamine levels?

The most common causes are heavy or long-term alcohol use, gastric bypass surgery, and chronic illnesses that interfere with nutrient absorption in the gut. Poor diet, prolonged vomiting, or conditions that increase your body's need for thiamine, like fever or intense physical activity, can also play a role. Identifying the underlying cause helps you choose the right fix, whether that's dietary changes, supplements, or addressing an absorption issue.

How often should I retest?

If your first result comes back low, retesting after 2-3 months of dietary changes or supplementation is a reasonable timeframe to see if your level has improved. If your levels are normal but you have ongoing risk factors like heavy alcohol use, checking once a year is a good habit. Your trends feature makes it easy to compare results over time.

What should I do if my results are abnormal?

If your thiamine comes back low, start by increasing thiamine-rich foods like whole grains, pork, and legumes, and consider a daily B1 supplement. Cutting back on alcohol, if that applies to you, can make a big difference in how well your body absorbs and stores this vitamin. Retest in a couple of months to see if your level has moved into the normal range, and seek medical care promptly if you experience severe symptoms like confusion or an irregular heartbeat.

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.

Vitamin B1 (Thiamine) Test - Nutrient Deficiency 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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