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At-home vitamin D tests can be as accurate as those done in a doctor’s office. They also vary by price, level of medical support, and more. Here are four tests to consider.

Vitamin D is an essential nutrient that helps you maintain strong bones and muscles. But deficiencies are common among older adults, those with darker skin tones, people with certain conditions, such as liver or kidney disease, and people following restrictive diets.

If you are at risk of vitamin D deficiency or are worried about your levels, an at-home test may be a good first step. Here, we explain how these tests work, who should use them, and recommend the best options.

The most accurate measurement of your vitamin D levels is a 25-hydroxy vitamin D test. It measures your blood level of 25-OH vitamin D, or the form of D that is converted and used by your body.

Done through a blood draw in a doctor’s office or via a finger prick blood sample at part of an at-home kit, this test can determine whether your vitamin D levels are too high, too low, or adequate.

This test is also known by other names, including 25(OH) D, calcidiol, or cholecalciferol test. It can be an important indicator of vitamin D deficiency, which can lead to osteoporosis (bone weakness) and rickets (bone malformation).

The 25(OH)D test is particularly useful for individuals at risk of a deficiency, such as those with limited sun exposure, people who eat a vegan diet, or people with medical conditions that make it difficult for the body to absorb nutrients from food or to convert vitamin D into a usable form.

Price per testTime to resultsMedical supportPayment options
Everlywell$495–7 daysphysician reviews resultsFSA/HSA eligible
LetsGetChecked$892–5 days• physician review
• 24/7 nurse support
FSA/HSA eligible
myLAB Box$892–5 daysno consultation includedFSA/HSA eligible
CVS Health At Home$39.993–5 daysno consultation includedFSA/HSA eligible

We considered the following factors when determining which products should make our list:

  • Company reputation: We selected tests that reputable companies offered. Furthermore, our internal vetting team thoroughly vetted each company based on its business practices.
  • Lab certification: All the tests below are processed in Clinical Laboratory Improvement Amendments (CLIA) certified facilities to ensure compliance with safety and quality standards.
  • Test methodology: During vetting, Healthline’s medical experts reviewed the methodology behind each test to ensure it’s based on sound science.
  • Customer reviews: We chose tests that have mostly positive online ratings and paid close attention to mentions of overall value and ease of use.

A vitamin D test might be beneficial for:

  • people who don’t get regular sun exposure
  • those at risk for vitamin D deficiency
  • people with dairy allergies or those who follow restrictive diets
  • individuals who have low levels of other important nutrients, like magnesium (which plays a crucial role in vitamin D activation in the body)
  • those with symptoms of a vitamin D deficiency
  • people taking vitamin D supplements to check whether their vitamin D levels are improving

People who may be at a higher risk of deficiency include:

  • older adults
  • those with darker skin tones
  • those who have undergone bariatric surgery
  • people following restrictive diets
  • people with certain conditions, including obesity, Crohn’s disease, and chronic liver or kidney disease

How often should I test my vitamin D levels?

Research suggests that it’s best to wait at least 3 months before retesting to see if your vitamin D levels have changed after starting your treatment plan, which can help avoid unnecessary stress and medical expenses.

If you’re concerned about your vitamin D or are at high risk for a deficiency, testing vitamin D twice a year — in the spring and again in the fall — can alert you of any changes.

If you and your healthcare professional have determined that you would benefit from an at-home vitamin D test, there are some factors you’ll want to consider as you choose:

  • Time: How fast do you need your results? What is the expected turnaround time from this company?
  • Cost: How much does this test cost compared to your insurance copay at a lab? Do you have FSA/HSA funds you could use?
  • Support: Will you be able to talk about your results with a qualified medical professional? It can be stressful to get lab results with no interpretation.
  • Accreditation: Does this company work with a reputable lab, preferably accredited by laboratory accreditation agencies?

You can increase your vitamin D levels by:

  • To learn more about your test results: If you have test results and you’d like to understand them better, it’s a good time to reach out to a healthcare professional. They can help you interpret the results and determine the next steps.
  • To discuss symptoms that may be affecting your daily life: If you’re experiencing symptoms like constant or increased tiredness, hair loss, slow wound healing, or chronic pain, it’s a good idea to contact a health professional. They can check your vitamin D levels with a blood test and help you rule out other causes of your symptoms.
  • If changes to boost vitamin D haven’t seemed to help: If spending more time in the sun and increasing your dietary intake of vitamin D haven’t improved how you’re feeling, it’s worth talking with a healthcare professional.

You can check your vitamin D levels at home using an at-home test kit, which typically involves a simple finger prick blood sample. After collecting your sample, you can send it in for analysis.

These kits provide a convenient and accurate way to monitor vitamin D levels, especially for those at risk of deficiency.

Currently, there are no rapid tests for vitamin D. Vitamin D levels are typically measured through blood tests that require laboratory analysis, which can take a few days to process.

These tests, including at-home kits, provide accurate results but do not offer immediate insights like some rapid tests for other conditions.

The most reliable test for measuring vitamin D levels is the 25-hydroxy vitamin D blood test, often referred to as a 25(OH)D test. This test measures the amount of 25-hydroxy vitamin D in the blood, which is the best indicator of overall vitamin D status in the body.

Vitamin D is an important micronutrient because it plays a large role in bone and immune system health. Many people with vitamin D deficiency don’t experience any symptoms. So, testing your vitamin D levels may help provide information about your health.

An at-home test is a convenient way to monitor your vitamin D levels. Note that there isn’t much research available on the benefits of screening for vitamin D deficiency.

Before ordering a test, it’s important to speak with a healthcare professional to determine whether testing is needed and, if so, how often. A healthcare professional can also recommend any at-home testing options and advise you on your results and treatment for a vitamin D deficiency.