Ordering the Vitamin D Assay | New York Only
Vitamin D Assay | New York Only helps measure the amount of vitamin D in your blood, which plays a key role in how your body absorbs calcium and supports strong bones. Low or high vitamin D levels can affect bone strength, muscle function, and even your mood. Interestingly, vitamin D is not only obtained from sunlight but also from certain foods, and some people may not absorb it well even with regular sun exposure.
Ordering this test can help you:
- Identify if your vitamin D levels are too low or too high
- Monitor how well your body absorbs calcium for bone strength
- Track changes in vitamin D after starting supplements or dietary changes
- Support your doctor in diagnosing causes of bone pain or muscle weakness
- Detect vitamin D issues that may be linked to mood changes or fatigue
Who Should Consider Vitamin D Blood Testing
People who spend most of their time indoors, have darker skin, or live in areas with little sunlight may benefit from this test. For example, someone who feels tired and has frequent muscle aches during the winter months might want to check their vitamin D levels to see if low levels are contributing to their symptoms.
Ordering this test may also be helpful if you:
- Have a family history of osteoporosis or bone fractures
- Experience unexplained bone or joint pain
- Notice hair thinning or loss that is not explained by other causes
- Are managing an autoimmune condition and want to monitor vitamin D status
- Have gained weight unexpectedly and want to rule out vitamin D deficiency as a factor
Checking your vitamin D status can help you and your doctor make decisions about supplements, diet, or other treatments to improve bone strength, muscle function, and mood. Delaying this test could mean missing early signs of a deficiency, which may lead to weaker bones or ongoing fatigue that could have been addressed sooner. Take the next step to get clear answers about your vitamin D levels.
Preparing for Vitamin D and Bone Health Testing
Fasting is not required for this test, so you can eat and drink as usual before your blood draw. Always follow any instructions your doctor or healthcare provider gives you to make sure your sample is collected correctly and your results are as useful as possible.
Labs Included When Ordering Your Vitamin D Assay | New York Only
| Test Name | Reference Range | What This Test Measures | Low and High Levels of Vitamin D Assay | New York Only |
|---|---|---|---|
| 25-Hydroxyvitamin D, Total | 30-100 | Shows the total amount of vitamin D in your blood, including both D2 and D3 forms. This is the main marker used to check vitamin D status. |
High levels mean you may be getting too much vitamin D from supplements or other sources.
Low levels mean your body may not be getting or absorbing enough vitamin D, which can affect bone and muscle strength. |
| 25-Hydroxyvitamin D3 | 20-80 | Measures the D3 form of vitamin D, which is made in your skin from sunlight and found in some foods. D3 is the most active form in your body. |
High levels mean you may be taking too much vitamin D3 or getting a lot of sun exposure.
Low levels mean you may not be making enough vitamin D3 from sunlight or not getting enough from your diet. |
| 25-Hydroxyvitamin D2 | <10 | Checks the D2 form of vitamin D, which comes from plant-based foods and some supplements. D2 is less common but still important for total vitamin D. |
High levels mean you may be taking high doses of vitamin D2 supplements.
Low levels mean you may not be getting enough vitamin D2 from plant-based foods or supplements. |
Reference ranges may change slightly as labs update their guidelines, so always check your report for the most current information.
Vitamin D Assay | New York Only FAQ
Is there Vitamin D Assay | New York Only testing near me?
This test is available as a kit that you can use at a local draw site—see the draw location link at the top of the page. If you have symptoms like bone pain or muscle weakness, having a nearby collection site makes it easier to get tested quickly and start addressing your concerns.
How do I interpret the test results?
While your treating physician should review your results, you can also use our one-on-one test results review service with our clinical team for a detailed explanation and next steps.
What is the cost of the test?
The price you see includes standard shipping to your address and return shipping to the lab, but local draw fees may apply. Testing can help you find out if low vitamin D is causing symptoms like fatigue or bone pain, so you can start feeling better sooner.
How often should I retest?
Most people retest every 3-6 months, especially if they are starting or changing supplements or have ongoing symptoms. Regular testing helps track changes and make sure your vitamin D levels stay in the right range.
How accurate is the test?
This test uses liquid chromatography-tandem mass spectrometry (LC-MS/MS), which is highly specific and sensitive for vitamin D measurement, with a specificity of 99% and sensitivity of 98%. TrueHealthLabs.com partners with CLIA-certified and CAP-certified laboratories to uphold rigorous testing standards for dependable results.
Medical Review Board
Reviewed by Jeff Donohue M.D. from Body Logic and Brady Hurst DC, CCCN. Written by True Health Lab’s team of editorial health contributors.
Disclaimer: This information is for educational purposes only and not intended as medical advice. Consult your healthcare provider for personalized guidance.
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