Order Vitamin B6 (Pyridoxine) Blood Test from JustLabs for $39 ($57 all-in for a single-test order: $39 + one $18 lab & physician order fee per order). Price includes lab processing at Quest Diagnostics. No insurance required.
Vitamin B6 is essential for over 100 enzyme reactions, particularly protein metabolism, neurotransmitter synthesis, immune function, and hemoglobin production.
Vitamin B6 (pyridoxine) is a water-soluble vitamin that serves as a cofactor for more than 100 enzymes involved in protein metabolism, red blood cell formation, and neurotransmitter synthesis. It's essential for producing serotonin, dopamine, and GABA—brain chemicals that regulate mood, sleep, and cognitive function.
B6 also plays crucial roles in immune function, hemoglobin synthesis (oxygen-carrying protein in blood), and converting stored glycogen to glucose for energy. It works closely with B12 and folate in homocysteine metabolism, and adequate B6 helps keep homocysteine levels in check.
While deficiency is relatively uncommon in people eating varied diets, certain populations are at risk, including older adults, people with autoimmune disorders, those with kidney disease, and individuals taking certain medications. Notably, B6 toxicity from excessive supplementation can cause peripheral neuropathy—a concern that makes testing valuable for those supplementing.
Price
$39
All-in
$57
incl. $18 lab & physician fee
Results
3-5 business days
Fasting
Not Required
What's Measured
What This Test Measures
This test measures pyridoxal 5'-phosphate (PLP), the active form of vitamin B6, in your blood plasma. Normal levels typically range from 5-50 ng/mL. Levels below 5 ng/mL indicate deficiency, while chronically elevated levels from supplementation may cause toxicity.
Who Should Consider This Test
People with peripheral neuropathy symptoms, those taking high-dose B6 supplements (for nausea, PMS, carpal tunnel), individuals with autoimmune conditions (especially rheumatoid arthritis), people with kidney disease, older adults with poor nutrition, anyone with anemia not responding to iron, and those on medications that deplete B6.
Health Insights
Conditions Screened
Related Symptoms
When to Get Tested
No fasting required. B6 supplements should be stopped for 24-48 hours before testing for accurate baseline results. Inform your provider about all supplements you take.
No fasting needed. How to prepare for your blood test →
Understanding Your Results
Normal B6 (PLP) is 5-50 ng/mL. Low levels indicate deficiency requiring supplementation and investigation of causes. Very low levels can cause anemia and neurological symptoms. High levels (>100 ng/mL) from chronic supplementation above 100mg/day can paradoxically cause sensory neuropathy.
What to Expect
After placing your order, we send it straight to Quest Diagnostics — there is no consent form to sign and no partner email to wait for. Your requisition is usually ready to download from your dashboard within about an hour, and you can book your blood draw at any Quest Diagnostics location.
The blood draw typically takes just a few minutes. Results are usually available within 3-5 business days and will appear in your secure JustLabs dashboard.
Our results include reference ranges and easy-to-understand indicators showing whether your values are within normal limits.
How much does the Vitamin B6 test cost?
The Vitamin B6 test costs $39 at JustLabs — $57 all-in, since the $18 lab & physician order fee is charged once per order, however many tests you add. The price is fixed before your blood draw; no insurance or doctor visit needed.
| Option | Price | Order all-in | Notes |
|---|---|---|---|
| Vitamin B6 at JustLabsDrawn at Quest Diagnostics | $39 | $57 | Includes the one $18 fee, charged once per order |
Paying with an HSA or FSA? See which lab tests qualify
Frequently Asked Questions
Hospital cash price: $100–$200
$39
+ $18 order fee · $57 all-inOne $18 fee per order covers your Quest blood draw and the independent physician order, however many tests you add.
- Results in 3-5 business days
- No fasting required
- Physician order included
No insurance needed · HSA/FSA eligible
- Physician-ordered
- CLIA-certified Quest lab
- Drawn at Quest Diagnostics
Need Help Choosing?
Not sure if this is the right test for you? Take our quick questionnaire.
Take the QuizRelated Tests
B12
Vitamin B12
$8
Measures B12 levels essential for nerve function, DNA synthesis, and red blood cell formation.
Biomarkers:
Vitamin B12
Folate
Folate, Serum
$10
Measures folic acid levels important for cell division, DNA synthesis, and preventing birth defects.
Biomarkers:
Folate
Homocysteine
Homocysteine
$23
Amino acid linked to cardiovascular risk when elevated. Also indicates B vitamin status.
Biomarkers:
Homocysteine
CBC w/ Diff
Complete Blood Count with Differential
$6
Comprehensive blood cell analysis including red cells, white cells, platelets, and white cell differential.
Biomarkers:
WBC, RBC, Hemoglobin +11 more
$39
+ $18 order fee · $57 all-in