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Vitamin D, also known as “the sunshine vitamin,” is actually a hormone produced in your body when your skin reacts with sunlight and other nutrients in your body. Vitamin D is not found naturally in many foods — but it is essential to healthy bones and a properly functioning immune system, among other things.

According to a 2018 study that analyzed national health data from 2001 to 2010, about 28.9 percent of people in the United States have a vitamin D deficiency, 40.1 percent have insufficient vitamin D, and fewer than 30 percent have enough vitamin D to promote optimal health outcomes. Globally, it is estimated about 50 percent of people have insufficient levels of vitamin D.

Thankfully, testing your vitamin D levels is relatively easy. Keep reading to learn about four of the best at-home vitamin D tests. They can help you find fast, easy, and accurate answers to whether your vitamin D is in the recommended range.

Vitamin D is a fat-soluble vitamin that can be stored in your body for a long time. This important nutrient helps maintain strong bones and muscles by helping with the absorption of calcium and phosphorus (two other micronutrients essential to healthy bones).

Without enough vitamin D, children may not reach their peak bone density or even their maximum height. Adults with chronic low levels of vitamin D may be more prone to fragile and broken bones.

Additionally, research shows vitamin D is important for more than just the health of your muscles and bones. A vitamin D deficiency may be associated with an increased risk of heart disease, diabetes, autoimmune disease, and cancer.

Low vitamin D levels have also been associated with poorer cognitive function in older adults, although the effects of vitamin D supplementation on cognition aren’t yet clear.

Vitamin D levels are identified based on amounts found in your blood, measured in nanograms per milliliter (ng/mL) or nanomoles per liter (nmol/L).

  • High levels: above 50 ng/mL (125 nmol/L)
  • Adequate levels: 20 to 50 ng/mL (50 to 125 nmol/L)
  • Inadequate levels: 12 to 20 ng/mL (30 to 50 nmol/L)
  • Deficient levels: 12 ng/mL (30 nmol/L) or below

The Office of Dietary Supplements (ODS) says that both high and low levels of vitamin D are linked to negative health effects. These can affect the bones and other body systems of children and adults.

With about 40 percent of the U.S. adult population being classified as low in vitamin D, you may be wondering what causes this condition.

It’s worth noting that a true vitamin D deficiency (blood levels below 12 ng/mL) is actually much less common, particularly in the United States, where many foods like milk and cereal are fortified with vitamin D.

But many adults do have lower than optimal vitamin D levels. And, given the importance of vitamin D for musculoskeletal health, heart health, your immune system, and even cancer prevention, this is worth paying attention to.

People who are at a higher risk of developing a vitamin D deficiency include:

  • people with limited sun exposure
  • people with darker skin tones
  • people who have low levels of other important nutrients, like magnesium (which plays a crucial role in vitamin D production in the body)
  • people with very restricted diets
  • older adults
  • people with chronic kidney disease or liver disease
  • people with obesity
  • people with a history of bariatric surgery
  • people with conditions affecting the intestines, like Crohn’s disease or gastric cancer
  • people with dairy allergies or who follow vegan diets

Many people with a vitamin D deficiency don’t experience any symptoms. But a healthcare professional can identify the following signs of a vitamin D deficiency:

  • low calcium levels
  • overactive parathyroid
  • fragile bones
  • muscle twitching and weakness
  • fatigue
  • rickets, which may develop in children
  • depression, including seasonal affective disorder

If you’ve had a vitamin D deficiency in the past, talk with your healthcare professional about whether at-home tests can help with monitoring your vitamin D levels, or if monitoring is needed at all. Your healthcare professional can also help determine what frequency of testing you may need.

A vitamin D test tells you how much vitamin D is in your bloodstream. This is a little more complicated than you might think, as vitamin D undergoes several changes before it can be used in your body.

Both the vitamin D you eat and naturally produce from sun exposure start as an inactive form, 25-hydroxyvitamin D (25-OH D). Later, the liver and kidneys convert 25-hydroxyvitamin D (25-OH D) into the biologically active form, 1,25-dihydroxy vitamin D.

Most vitamin D tests measure the total amount of 25-OH D in your blood. This is because 25-OH D has a longer half-life than that of 1,25-dihydroxy vitamin D (meaning, it remains in your bloodstream longer and is a more accurate measure of how much vitamin D your body has to work with).

How do vitamin D tests work?

Vitamin D tests need a blood sample to measure 25-OH D levels. In a doctor’s office or a lab, a trained technician called a phlebotomist draws blood from a vein in your arm. At-home tests typically have you prick and squeeze a finger to collect a smaller blood sample.

It’s easier to measure 25-OH D because it lasts longer in the bloodstream, around 14 days. It’s also easier to detect changes in 25-OH D levels that are associated with vitamin D deficiency.

By comparison, 1,25-dihydroxy vitamin D has a half-life of just a few hours. Its levels may not decrease with vitamin D deficiency or change in a way that is clear until vitamin D deficiency is severe.

A vitamin D test can determine whether you have a vitamin D deficiency or excess levels in your body.

You may have excess vitamin D if you’re taking large doses of vitamin D supplements. Vitamin D deficiency is more common.

Your physician or healthcare professional is the best person to help you determine if you are at risk for low vitamin D and whether testing would be helpful.

Read more about healthy vitamin D levels and improving yours through diet and supplements.

There’s a lot to consider when it comes to choosing an at-home vitamin D test. To select the best options, we reviewed available research, customer experiences, price, and each company’s processes for medical and business standards.

Read more about Healthline’s vetting process and standards.

Most affordable

Everlywell

  • Price: $49
  • Insurance coverage: Everlywell doesn’t accept insurance, but they do accept payments from a health savings account (HSA) or flexible savings account (FSA).
  • Results: within 5 days

In addition to being among the most budget-friendly options on our list, Everlywell is one of the more well-known at-home health and wellness testing services. They offer a large number of at-home blood tests and have overall very positive reviews.

The Everlywell Vitamin D Test measures your 25-OH D levels. The results tell you the amount of vitamin D in your blood.

The test comes with everything you’ll need for the finger prick blood sample and includes prepaid shipping for returning your sample. Once it arrives, a team of physicians will review your lab results. The company estimates you’ll receive results around 5 days after shipping the sample.

Everlywell also offers a membership program for $24.99 per month to receive discounts on their tests. With a membership, the test costs $24.99. You can cancel the membership at any time.

Your lab results come with an easy-to-read report to help you take healthy, actionable steps. You also have the option to attend a live webinar led by a healthcare professional.

Best for medical support

LetsGetChecked

  • Price: $89
  • Insurance coverage: LetsGetChecked doesn’t accept insurance, but they do accept FSA and HSA payments.
  • Results: within 2 to 5 business days

LetsGetChecked offers a variety of at-home testing kits, including categories like men’s health, women’s health, fertility, screening, and lab tests.

LetsGetChecked is unique for the medical support they offer. After taking the test, you’ll have access to a team of nurses 24/7. A nurse will also call you to help you understand your results.

The test comes with all the materials you need to collect a sample, as well as test directions and a shipping label for return. For this test, LetsGetChecked requests you collect your sample in the morning. Physicians will review the test results and lab analysis.

The company has 4.5 out of 5 stars and more than 12,000 reviews on Trustpilot.

LetsGetChecked laboratories are Clinical Laboratory Improvement Amendments (CLIA)-certified and accredited with the College of American Pathologists, which are the highest levels of accreditation. Their kits are also manufactured within an ISO 13485 accredited facility, the highest level of accreditation for medical devices.

Use the code “HEALTH20” for a 20% discount.

Best for fast delivery

myLAB Box

  • Price: $89
  • Insurance coverage: myLAB Box doesn’t accept insurance, but they do accept FSA and HSA payments.
  • Results: within 2 to 5 days

myLAB Box offers a series of at-home tests to monitor your health and wellness. They also provide one free physician consultation for test results outside the normal range.

For this test, you’ll collect a blood sample via finger prick. myLAB Box offers fast results by including a free 2-day shipping label and provides you with results 2 to 5 days after receiving the sample.

The company is registered with the Food and Drug Administration (FDA) and Centers for Disease Control and Prevention (CDC), and states that it works with CLIA and CAP-certified labs.

myLAB Box has many 5-star reviews on its website, but only two reviews are listed specifically for the vitamin D test.

Honorable mention

Cerascreen

  • Price: $49
  • Insurance coverage: The Cerascreen website doesn’t state whether they accept insurance or HSA or FSA payments.
  • Results: varies

The Cerascreen vitamin D test is another relatively affordable test option (although, depending on your insurance coverage, you may have a lower copay by just going to a lab to get your levels checked). The price includes two to 5-day shipping to return the sample to the lab. Results will be provided a few days (but up to a week) after that via the Cerascreen app and your email.

Your test will be analyzed in a certified medical lab. You’ll receive a personalized report with your results. The report includes your current 25-OH D level and provides actionable steps to maintain a healthy vitamin D level. You can also schedule a free call with a nutritionist to talk about a plan and any questions you have.

Note that you can’t purchase this test in New York, New Jersey, Rhode Island, or Maryland.

On the Cerascreen website, the vitamin D test has 5 out of 5 stars with just over five reviews.

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?

Price per TestTime to ResultsLab StatusMedical SupportPayment OptionsSample Collection Method
Everlywell$495 days or lessCLIA-certifiedPhysician reviews resultsFSA/HSA eligibleFinger prick – blood
LetsGetChecked$892-5 daysCLIA & CAPPhysician review; 24/7 nurse supportFSA/HSA eligibleFinger prick – blood
myLAB Box$892-5 daysCLIA & CAPTelemedicine consult for abnormal resultsFSA/HSA eligibleFinger prick – blood
Cerascreen$497 daysCLIA-certifiedPhysician review of results; nutritionist consultnot specifiedFinger prick – blood

Are at-home vitamin D tests accurate?

Accuracy can depend on sample collection. User error is always a possibility with at-home tests, so it’s important to carefully follow the instructions provided. Overall, at-home vitamin D tests may be as accurate as traditional lab tests if performed correctly.

But given the margin for error, it may be best to have your blood drawn at a lab facility by a certified lab technician. If you are unsure whether at-home or in-lab testing is right for you, give your physician a call.

How often should I test my vitamin D levels?

If you have a vitamin D deficiency, regular testing may help you and your healthcare professional determine if your treatment plan is working or if it should be adjusted.

But research suggests that you should wait at least 3 months before retesting to see if your levels have changed, as testing too soon probably won’t show any changes to your vitamin D levels and may lead to unnecessary stress and medical expenses.

It isn’t considered best practice to screen for vitamin D deficiency in otherwise healthy individuals, so it’s ideal to speak with your healthcare professional first before trying an at-home test.

Some experts say that if you are concerned about your vitamin D or are at high risk for low vitamin D levels, testing them twice per year — in the spring and again in the fall — can alert you to any changes and help ensure they continue to stay within a healthy range.

There is not currently research to support any benefits to screening for vitamin D deficiency, however, and it is possible that people may experience added costs and stress by checking their levels at home. If you are concerned about your vitamin D levels, speaking with your healthcare professional is a great place to start.

What is the normal range for vitamin D levels?

Most vitamin D tests measure the total amount of 25-OH D in your blood.

According to the ODS, adequate 25-OH D levels range from 20 ng/mL to 50 ng/mL. Levels below 12 ng/mL are typically associated with vitamin D deficiency.

How can I increase my vitamin D levels?

You can increase your vitamin D levels by spending time in the sun (you need about 10-15 minutes in the sun without sun protection on 40 percent of your body), eating foods with vitamin D, or taking supplements containing vitamin D.

Foods high in vitamin D include:

  • To learn more about your test results. If you have test results and you’d like to better understand them, it’s a good time to reach out to a healthcare professional. They can help you interpret the results and determine next steps.
  • To have a general checkup. Even if you’re in good health, if you haven’t seen a doctor in a while, you can ask for a general health screening that includes testing your vitamin D levels.
  • 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 behind your symptoms.
  • If changes to boost vitamin D have not 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.

Vitamin D is an important micronutrient for your health, as 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 your healthcare professional to determine if testing is needed and, if so, how often. Your healthcare professional can also recommend any at-home testing options and advise you on your results and treatment for a vitamin D deficiency.