What's this test for?

This test is ideal if you're experiencing persistent fatigue, bone pain, muscle weakness, or unexplained health issues that might be linked to vitamin D. It measures the active, bio-available form of vitamin D in your body, which is especially important if you have kidney problems, calcium imbalances, or conditions affecting how your body processes vitamin D. Many people use this test when standard vitamin D tests come back normal but symptoms persist, or when their doctor suspects an issue with vitamin D activation rather than deficiency.

What happens after I get my results?

You'll receive detailed doctor notes in simple language explaining what your active vitamin D levels mean for your bone health, calcium balance, and overall wellness. These notes include personalized recommendations like dietary adjustments, supplement guidance, or whether you should follow up with an endocrinologist or nephrologist. You'll also get the standard lab report and can track your vitamin D levels over time using our trends feature to see how your interventions are working.

What's included in this test?

This test measures Vitamin D, 1,25 (OH)2 Total (the active form), along with Vitamin D2, 1,25 (OH)2 and Vitamin D3, 1,25 (OH)2 separately. This comprehensive breakdown helps identify whether your body is properly converting vitamin D into its active form, which is crucial for calcium absorption, bone health, and immune function. Unlike standard vitamin D tests that measure storage forms, this test reveals how much biologically active vitamin D is actually available for your body to use right now.

How should I prepare for this test?

No special preparation is typically required for this test. You can take it at your regular eating schedule and continue taking your medications and supplements as prescribed. However, if you're taking high-dose vitamin D supplements, your doctor may want you to note the dosage and timing. Check with your healthcare provider if you have specific concerns about preparation.

When will I get my results?

Most results from this specialized LC/MS/MS test are available within 3-5 business days after your sample reaches the lab. Because this test uses advanced mass spectrometry technology for precise measurement of active vitamin D forms, it may take slightly longer than routine vitamin D tests. You'll receive an email notification as soon as your results are ready to view in your secure online account.

Who should consider getting this test?

This test is especially important for people with chronic kidney disease, those experiencing unexplained low calcium levels, or anyone with bone disorders like rickets or osteomalacia. It's also valuable if you have normal vitamin D storage levels but still experience symptoms of deficiency, or if you have conditions affecting vitamin D metabolism like hypoparathyroidism or granulomatous diseases. Your doctor may order this test if standard vitamin D tests don't explain your symptoms.

What symptoms indicate I may need this test?

Consider this test if you experience persistent bone pain, muscle weakness, frequent fractures, or unexplained fatigue despite normal vitamin D levels. Other indicators include unexplained high or low calcium levels, kidney disease symptoms, or conditions like sarcoidosis. This test is particularly useful when you have symptoms that suggest a problem with how your body activates vitamin D rather than just low vitamin D intake or storage.

How can I naturally support my vitamin D levels?

Getting 10-30 minutes of midday sun exposure several times per week can help your body produce vitamin D naturally, though this creates the storage form that must be activated. Include vitamin D-rich foods like fatty fish (salmon, mackerel), egg yolks, fortified dairy products, and mushrooms exposed to UV light. However, since this test measures the active form, supporting kidney health through proper hydration, blood pressure control, and limiting processed foods is equally important for proper vitamin D activation.

What is the active form of vitamin D and why does it matter?

The active form of vitamin D, called 1,25-dihydroxyvitamin D or calcitriol, is what your body actually uses to absorb calcium, maintain bone health, and support immune function. Your body converts stored vitamin D through a two-step process involving your liver and kidneys to create this active form. If your kidneys aren't working properly or you have certain conditions, you might have plenty of stored vitamin D but not enough active vitamin D, which is why this specific test is valuable for diagnosing certain health issues.

What does high active vitamin D mean?

Elevated levels of active vitamin D can indicate conditions like sarcoidosis, certain lymphomas, or overactive parathyroid glands that are causing too much vitamin D activation. High levels can lead to excessive calcium absorption, causing symptoms like nausea, weakness, frequent urination, and kidney problems. If your active vitamin D is high, your doctor will investigate the underlying cause and may recommend reducing vitamin D supplementation or treating the condition causing overproduction.

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.

Active Vitamin D Test - Fatigue & Bone Health

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]

Blood Test for Fatigue and Bone Health

Vitamin D, 1,25-Dihydroxy, LC/MS/MS

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

How should I prepare for this test?

What's included in this test?

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

Blood Test for Fatigue and Bone Health

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

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