Vitamin D (25-OH) Test

About this test

Key Benefits

Understand your Vitamin D status with a convenient at-home test. Vitamin D plays an important role in several bodily functions and maintaining adequate levels is important for overall health.

• Bone Health Support: Vitamin D supports calcium absorption, which contributes to maintaining normal bone health.

• Immune System Function: Adequate Vitamin D levels contribute to the normal function of the immune system.

• Mood and Well-being: Vitamin D is involved in several physiological processes that influence overall well-being.

• Deficiency Identification: Testing your levels can help identify whether your Vitamin D status is within a typical reference range.

What This Test Measures

The GetTested Vitamin D (25-OH) Test measures 25-hydroxyvitamin D (25-OH D) in your blood.

This is the main circulating form of Vitamin D and the most commonly used marker for evaluating Vitamin D status. It reflects contributions from both:

• Vitamin D2 (ergocalciferol)

• Vitamin D3 (cholecalciferol)

Measuring 25-OH Vitamin D provides an overall assessment of your body’s Vitamin D levels.

How It Works

Our process is designed to make testing simple and convenient.

1. Order Your Kit
   Purchase your Vitamin D (25-OH) test kit online.

2. Collect Your Sample
   Follow the instructions to collect a small finger-prick blood sample using the dried blood spot (DBS) method included in the kit.

3. Mail to Lab
   Send your sample to our CLIA-certified laboratory using the prepaid return packaging.

4. Receive Digital Results
   Within 2–5 business days after the laboratory receives your sample, your results will be available in your secure online portal.

Who Should Consider This Test

This test may be relevant for individuals who want to monitor their Vitamin D status, including:

• People with limited sun exposure, such as those who spend most of their time indoors or live in northern regions.

• Individuals experiencing symptoms sometimes associated with low Vitamin D levels, such as fatigue or muscle weakness.

• People with risk factors for Vitamin D deficiency, including older adults or individuals with conditions affecting nutrient absorption.

• Individuals who want to monitor Vitamin D supplementation.

• Health-conscious individuals interested in tracking nutritional status.

Biomarkers included

• 25-hydroxyvitamin D (25-OH D): 25-hydroxyvitamin D (25[OH]D) is the primary circulating form of vitamin D and the most reliable biomarker for assessing vitamin D status. It reflects the combined contribution from dietary intake, supplements, and skin synthesis through sun exposure. This marker is important for monitoring calcium metabolism, bone health, and immune function. Low levels are linked to reduced bone mineralization a

How to prepare

Fasting is generally not required, but avoid taking Vitamin D supplements for 24-48 hours before the test for an accurate baseline reading if advised by a healthcare professional.

Frequently asked questions

What does the GetTested Vitamin D (25-OH) Test measure and why is 25-OH Vitamin D important?

The GetTested Vitamin D (25-OH) Test precisely measures your 25-hydroxyvitamin D levels, which is the primary circulating form of vitamin D in your bloodstream and the best indicator of your overall vitamin D status. Monitoring these levels is crucial for understanding its role in bone health, immune function, and mental well-being, as deficiencies can impact calcium absorption and lead to various health concerns.

How does the Vitamin D (25-OH) Test work, and what is the sample collection process?

This convenient at-home test utilizes a dried blood spot (DBS) sample, collected via a simple finger prick. You'll receive a kit with clear instructions to collect a few drops of blood, which you then send to our CLIA-certified laboratory for analysis. This process offers a significant advantage in ease of use compared to traditional venipuncture.

Who should consider taking a Vitamin D (25-OH) Test?

Individuals experiencing symptoms of deficiency like fatigue, bone pain, muscle weakness, or frequent infections should consider this test. It's also highly recommended for those with limited sun exposure, darker skin tones, certain medical conditions affecting absorption, or anyone looking to proactively monitor their bone health and immune function for optimal well-being. Regular monitoring is also valuable for tracking the effectiveness of supplementation.

What is the turnaround time for results, and how will I interpret them?

Once your sample arrives at our laboratory, you can expect digital results delivered quickly, typically within 2-5 business days. Your comprehensive report will include your specific 25-OH Vitamin D levels, clearly defined reference ranges, and personalized insights into what your results mean for your health, empowering you to discuss potential next steps with your healthcare provider.

How accurate and reliable is the GetTested Vitamin D (25-OH) Test?

Our Vitamin D (25-OH) Test is processed in CLIA-certified laboratories, ensuring the highest standards of accuracy and reliability for your results. The dried blood spot method has been scientifically validated to provide precise measurements comparable to traditional venous blood draws, giving you confidence in your health insights.

What is included in the price of the Vitamin D (25-OH) Test?

The price includes the complete at-home sample collection kit, detailed instructions, prepaid shipping to our certified laboratory, and the comprehensive analysis of your 25-OH Vitamin D levels. You also receive secure digital access to your results and an easy-to-understand interpretation to guide your health decisions.

Are there any specific preparation instructions for the Vitamin D (25-OH) Test, such as fasting?

No, fasting is generally not required for the Vitamin D (25-OH) Test. However, it is advisable to follow any specific instructions provided in your test kit to ensure optimal sample quality. For best practices, it's recommended to take the sample in the morning before any vitamin D supplementation for that day to get a baseline reading.

What are the key differences between Vitamin D2 and D3, and which does this test measure?

Our Vitamin D (25-OH) Test measures the total 25-hydroxyvitamin D, which includes both 25-hydroxyvitamin D2 (ergocalciferol) and 25-hydroxyvitamin D3 (cholecalciferol). While D2 is typically obtained from plant sources and fortified foods, D3 is produced by skin exposure to sunlight and found in animal products. Both contribute to your overall vitamin D status, and our test provides a comprehensive assessment of both forms.

Customer reviews

4.7/5 (3)

• 5/5 — The kit arrived quickly and the instructions were really clear. I had my results back in just a few days.
• 4/5 — This was much easier than going to a lab. The finger prick was barely noticeable.
• 5/5 — It's great to finally know my Vitamin D levels without a doctor's visit.