General
Vitamin D test
Lab test

Vitamin D test

Recommended for people with limited sun exposure, those taking vitamin D supplements who want to confirm their levels are in range, and anyone with fatigue, bone pain, or immune concerns that may be linked to deficiency. No fasting required. Results are available within 2–4 days and reviewed by a General Medicine clinician.

Receive actionable insights and deep analysis—not just lab values– in as little as 48 hours

Clear guidance, and follow-up care available

Simple, online scheduling for labs and everything else

Most insurance accepted

Board-certified

No hidden fees

Available nationwide

Complete insights in as little as 48 hours

1

Book your test

Instantly schedule at 2,000+ labs nationwide, at a time that works for you. Most visits take 15 minutes or less, with both walk-ins and appointments available.

2

Get results in 48 hours

Your results are delivered quickly—and reviewed by medical professionals. You’ll get clear explanations, robust health insights, and recommended next steps tailored to your health needs.

3

Take action with physician guidance

Choose to review your results and manage your plan with a General Medicine physician—or simply use the insights on your own.

4

Track progress over time

Repeat annually to see trends, improvements, and new emerging risks or book individual tests that focus on your set goals

What is a Vitamin D Test?

The Vitamin D test measures 25-Hydroxy Vitamin D — the most accurate and clinically validated form of vitamin D testing. This marker reflects how much vitamin D your body has available from both sun exposure and supplementation, providing a reliable indicator of whether your levels are sufficient to support bone health, immune function, and overall wellness.

Deficiency and insufficiency detection

Identifies vitamin D levels below the optimal range (below 30 ng/mL) — a common finding that has been associated with fatigue, bone loss, immune dysfunction, mood changes, and increased susceptibility to illness.

Supplementation effectiveness

Confirms whether vitamin D supplementation is achieving adequate blood levels, providing the objective data needed to adjust dosing rather than guessing based on what you're taking.

Baseline and ongoing monitoring

Establishes a starting point for people who have never tested their levels and supports tracking over time — particularly important for those at higher risk of deficiency due to limited sun exposure, darker skin, age, or malabsorption conditions.

What's included

Test type

Blood sample

Collection method

Venipuncture

Fasting

Not required

Results processing time

1 to 3 days

25 OH Vitamin D (also known as Vitamin D, 25-OH, 25-Hydroxy Vitamin D, or Vitamin D, 25-Hydroxy)

This test measures your vitamin D levels using the most reliable method, 25-Hydroxy Vitamin D. It tells you if your body has enough vitamin D to support your bones, immune system, and overall health.

All your care in one place. That’s the General Medicine difference.

We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
Clinician
Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

What our customers have to say

Hear from people who felt heard, understood, and supported on General Medicine.

“I found the ease of setting the appointment and how quickly I was able to be seen to be amazing. The physician was very friendly and amazingly helpful.”

Natalie, Texas

“The chat visit was super convenient. The doctor was friendly and took the time needed to answer any questions I had. The prescription I needed was called in and ready the same afternoon.”

Dustin, Tennessee

“I loved my General Medicine experience. It gave me peace of mind to know someone cared and I felt they listened to what I was saying.”

Ann, Florida

“General Medicine is easily the most approachable, efficient, high-quality, and responsive care team I've had the pleasure of working with.”

John, Utah

“General Medicine helped me get the imaging and blood work I needed, referred me to the right specialists, and even helped me find a new family doctor.”

Bridget, Mississippi

Order your lab test today.

Frequently Asked Questions

What level of vitamin D is considered deficient?

Below 20 ng/mL is generally considered deficient; 20–29 ng/mL is insufficient; 30–100 ng/mL is the optimal range for most adults. Levels above 100 ng/mL may indicate toxicity, which is rare but possible with high-dose supplementation.

Do I need to fast for a vitamin D test?

No fasting is required. Vitamin D levels are not affected by recent food intake, so you can eat and drink normally before your blood draw.

Why would I be vitamin D deficient if I spend time outdoors?

Sun exposure alone is often insufficient, especially in northern latitudes, during winter, with regular sunscreen use, or for people with darker skin. Factors like age, gut absorption issues, and obesity also reduce vitamin D production and storage, making testing the only reliable way to know your level.

Can vitamin D deficiency explain my fatigue, mood changes, or bone pain?

Low vitamin D has been associated with fatigue, low mood, bone and muscle pain, and immune dysfunction. While it's not the cause in every case, it's a common and easily correctable finding — which is why testing is valuable before supplementing blindly.

If I'm already taking a supplement, should I still test?

Yes — supplementation without testing means you're guessing at the dose. Testing confirms whether your current dose is getting your level into the optimal range, whether you're taking too little to make a difference, or — rarely — whether you're oversupplementing.
Logo

© 2026 Path Healthcare Systems Corp.