Ordering the Vitamin D Test | STTM
The Vitamin D Test | STTM helps measure the amount of vitamin D and calcium in your blood, which can show if your body is getting enough of these nutrients. This test is often used to help guide the right amount of vitamin D supplements, since too much or too little can affect your bones, immune system, and other body functions. Interestingly, vitamin D levels can also be influenced by how much sunscreen you use, not just by how much time you spend in the sun.
Ordering this test can help you:
- Find out if your vitamin D levels are too low or too high
- Adjust your vitamin D supplement dose safely
- Check if your calcium levels are in a healthy range
- Monitor your risk for certain autoimmune conditions
- Track changes in your vitamin D status over time
Who Might Benefit from Vitamin D and Calcium Blood Testing
Someone who feels tired often, has muscle aches, or gets sick more than usual may want to check their vitamin D and calcium levels. For example, a person who spends most of their day indoors and uses sunscreen regularly might not realize their vitamin D is low, even if they eat a balanced diet.
Ordering this test may also be helpful if you:
- Have a family history of autoimmune conditions like Hashimoto’s or multiple sclerosis
- Follow a diet high in processed foods
- Are managing weight concerns, including obesity
- Experience ongoing stress or smoke regularly
- Have thyroid issues, which can affect how your body uses vitamin D
Checking these levels can help you know if you need to make changes to your diet or supplements to support your bones and immune system. Waiting to order this test could mean missing early signs of low vitamin D, which may lead to changes in bone strength or immune function before you notice any symptoms.
Preparing for Your Vitamin D and Calcium Lab Work
Fasting is not needed before this blood test, so you can eat and drink as usual. Always follow any directions your doctor or healthcare provider gives you to make sure your results are as helpful as possible.
Labs Included When Ordering Your Vitamin D Test | STTM
| Test Name | Reference Range | What This Biomarker Means | Low and High Levels of Vitamin D Test | STTM |
|---|---|---|---|
| Vitamin D (25 Hydroxyvitamin D – dietary indicator; inactive form) | 30-100 | This marker shows how much vitamin D is stored in your body from food, supplements, and sunlight. It helps your doctor see if you are getting enough vitamin D for your bones and immune system. |
High levels mean you may be taking too much vitamin D, which can cause problems like kidney stones or high calcium.
Low levels mean your body may not be getting enough vitamin D, which can affect bone strength and immune response. |
| Calcium Serum | 8.6-10.2 | Calcium in your blood is important for strong bones, muscle movement, and nerve function. This test checks if your calcium is in a healthy range, which can be affected by vitamin D levels. |
High levels mean your body may be getting too much calcium, which can lead to kidney or heart issues.
Low levels mean you might not be absorbing enough calcium, which can weaken bones and muscles. |
Reference ranges can change over time. For the most current values, visit the Quest Diagnostics lab test directory.
Vitamin D Test | STTM FAQ
Is there Vitamin D Test | STTM testing near me?
You can find a nearby location for Vitamin D Test | STTM using the patient service center locator, which also lists mobile phlebotomy options. This is helpful if you have limited mobility or need a convenient site for regular blood draws to monitor your vitamin D and calcium levels.
What is the cost of the test?
The price you see for the Vitamin D Test | STTM includes all fees, including sample collection at patient service center locations. Ordering this test is worth it if you want to safely adjust your vitamin D supplements and avoid possible side effects from incorrect dosing.
How often should I retest?
It is recommended to retest every three to four months, especially if you are changing your vitamin D supplement dose or have a condition that affects vitamin D absorption. Regular retesting helps you keep your vitamin D and calcium levels in the right range for bone and immune support.
How accurate is the test?
The Vitamin D Test | STTM uses liquid chromatography-tandem mass spectrometry (LC-MS/MS), which is known for its high precision, with specificity and sensitivity both above 98%. TrueHealthLabs.com works with CLIA-certified labs to maintain high-quality testing standards you can trust.
Important Notes
- This test cannot be collected in NY, NJ, MA, and RI. Contact us with questions.
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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