Vitamin & Nutritional Testing

Vitamin and nutritional testing uses a blood sample to measure levels of specific vitamins, minerals, and related markers in your body. It is ordered when a deficiency or excess is suspected, or to monitor a known nutritional problem. Results help a clinician assess your nutritional status.

What it measures

Vitamin B12 — Helps nerves and blood cells; low levels can cause tiredness or tingling.
Vitamin D — Supports bones and muscles; low levels are common.
Folate — Works with B12 for blood and cell health.
Iron and ferritin — Iron carries oxygen; ferritin shows stored iron.
Calcium — A mineral important for bones, muscles, and nerves.
Vitamin B6 — Involved in metabolism and brain function.

Who it is for

A clinician may order this testing if you have symptoms of a deficiency, a restricted diet, a digestive condition, or are being monitored after treatment. It is not a routine screening test for everyone.

Preparation

Preparation depends on which nutrients are measured. Some tests require fasting, while many do not; follow the instructions given by your clinician or lab. Tell the lab about any supplements you take.

Results and what they mean

Results are reported as numbers with a reference range for each nutrient. A clinician interprets them alongside your symptoms, diet, and other tests; a single value does not confirm a diagnosis. This is general information, not medical advice.

How to order this test

Choose the test and place a confidential order online.
Select a certified collection site and pick a time that suits you.
Have your specimen collected — most draws take only a few minutes.
Review results in a secure portal, typically within 1–3 days.

Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.

Availability by state

Direct-access online ordering for the vitamin & nutritional testing is available in most states. It is currently unavailable in 6 states:

Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →

Frequently asked questions

Do I need to stop taking vitamins before the test?

Ask your clinician. Some supplements can affect results, and you may be told to pause them or to keep taking them as usual.

How long until I get results?

Turnaround is typically 1 to 3 business days, though it can vary by lab.

Can I eat before this test?

It depends on the specific nutrients being measured. Check your instructions; if none are given, ask the lab.

What if my level is outside the reference range?

Your clinician will consider the number, your symptoms, and your overall health to decide what it means.