Skip to content
Find My Test

Vitamin B12 & Folate (Folic Acid), Serum from Marek Health

Labbrary Test GradeUseful
Your Fit Score
Not calculated

Answer five questions to see how this panel matches your goals, budget, collection preferences, access, and support needs.

Calculate my fit

Labbrary's review, Fit Score, and basic comparison are free. The provider's panel, shipping, collection, clinician review, and other services are separate. About 2 minutes. No account required.

Check vitamin B12 and serum folate through Quest; follow the biotin preparation note.

Current price
$50 $60 with fees
Sample
Blood
Turnaround
14 days
Access
Direct Lab, Lab Visit, Order Online
Evidence & Key Facts
Source collectedLast source check September 9, 2026

Evidence basis. This named result reflects the sources and verification evidence listed on this page as of the date shown.

Best for

Micronutrients

Standout strength

Measures vitamin B12 and folate (folic acid) in serum for a focused nutrient-level assessment.

Important watch-out

Marek adds a $10 venipuncture fee to orders of $199 or less and waives it on orders over $199. No additional payment is required at the lab. Lab sales are final and non-refundable.

Vitamin B12 & Folate (Folic Acid), Serum from Marek Health
Labbrary Test GradeUseful
Your Fit Score
Not calculated

Answer five questions to see how this panel matches your goals, budget, collection preferences, access, and support needs.

Calculate my fit

Labbrary's review, Fit Score, and basic comparison are free. The provider's panel, shipping, collection, clinician review, and other services are separate. About 2 minutes. No account required.

Check vitamin B12 and serum folate through Quest; follow the biotin preparation note.

Current price
$50 $60 with fees
Sample
Blood
Turnaround
14 days
Access
Direct Lab, Lab Visit, Order Online
Evidence & Key Facts
Source collectedLast source check September 9, 2026

Evidence basis. This named result reflects the sources and verification evidence listed on this page as of the date shown.

Best for

Micronutrients

Standout strength

Measures vitamin B12 and folate (folic acid) in serum for a focused nutrient-level assessment.

Important watch-out

Marek adds a $10 venipuncture fee to orders of $199 or less and waives it on orders over $199. No additional payment is required at the lab. Lab sales are final and non-refundable.

Labbrary+

The Test Grade. The Reason Behind It.

Potentially useful for the right buyer, with meaningful evidence, coverage, transparency, access, cost, terms, or privacy tradeoffs to review.

A lower grade does not mean a panel is a bad personal fit. Your Fit Score can be higher when its purpose, price, sample, access, or support matches what you need.

Explore the Full Methodology
Labbrary Test GradeUseful

Next step

Check the panel or research the provider

Prices, availability, and ordering requirements can change. Confirm the current details before purchasing.

View Exact Panel on Provider SiteView Marek Health profile

Scope, both directions

Inside the Panel. Beyond the Name.

Named measurements

  • Vitamin B12
  • Folate (Folic Acid), Serum

Measured categories and focus areas

  • Vitamins
  • Micronutrients

Important limits and omissions

  • Vitamin B12 and serum folate are named. The exact assay methods, laboratory, validation, reference intervals and analytical performance remain unassessed. High-dose biotin may interfere with the test results.
  • Two named entries are included: Vitamin B12 and Folate (Folic Acid), Serum. RBC folate, methylmalonic acid, homocysteine, a complete blood count and other nutrient measurements are not included.
  • Results are emailed when available. Guided Optimization is a separate program with treatment eligibility requirements. An included consultation, individual interpretation service, actual sample report, reference-range explanation and follow-up plan have not been established for this test purchase.
  • Comparative value and clinical data or specimen privacy have not been fully assessed.

No broader panel in the Labbrary catalog lists every biomarker on this one for a lower listed price.

Counted among one-time lab-draw listings with a published price, matched by published biomarker names. That doesn’t mean the tests are equivalent. Updated October 2, 2026.

The full breakdown

Eight Dimensions.
One Named Result.

Open any row for the reasoning and evidence behind the named result.

Seller is Marek Diagnostics; the ordering clinician is Marek-arranged (provider reviews and approves test requests; no buyer clinician visit required) where stated. Collection route is the Quest Diagnostics laboratory system. A Quest draw location or the Marek relationship does not prove the exact performing facility, the assay method, or offer-specific analytical performance, which remain unpublished. Limitation: Seller is Marek Diagnostics; the ordering clinician is Marek-arranged (provider reviews and approves test requests; no buyer clinician visit required) where stated. Collection route is the Quest Diagnostics laboratory system. A Quest draw location or the Marek relationship does not prove the exact performing facility, the assay method, or offer-specific analytical performance, which remain unpublished.

Exact named measurement scope per the product page title and description. Limitation: No additional limitation was recorded in the authority row.

Named analytes per the exact offer; panel boundaries per the product page. Limitation: No additional limitation was recorded in the authority row.

Result delivery format partially documented. Limitation: No additional limitation was recorded in the authority row.

Exact price, purchase route, and ordering model on the product page; performing lab assignment unpublished. Limitation: No additional limitation was recorded in the authority row.

Online ordering with provider-approved test requests; Quest collection; state restrictions apply. Limitation: No additional limitation was recorded in the authority row.

Exact-offer price on the product page; refund and draw-fee terms per shared policies. Limitation: No additional limitation was recorded in the authority row.

Shared Marek privacy policy governs order data; specimen and result retention unresolved. Limitation: No additional limitation was recorded in the authority row.

What it asks of you

Sample and fulfillment journey

Order

Confirmed

Order Vitamin B12 & Folate (Folic Acid), Serum online for $50 before any checkout fees. Healthcare-provider review and approval is arranged without an office visit.

Panel-specific source · Source dated September 9, 2026

Collect

Confirmed

Order online for healthcare-provider review and approval, then provide a blood sample at a Quest location. No healthcare-provider office visit is required. Confirm preparation and collection instructions for this exact test. High-dose biotin can interfere with this test. The preparation instruction is to stop biotin supplements at least 72 hours before the blood draw.

Panel-specific source · Source dated September 9, 2026

Lab

Confirmed

Results typically arrive within 14 business days. Approximately two weeks is a general estimate that varies with test size and complexity; it is not a guaranteed calendar-day deadline. The exact laboratory performing the assay has not been independently identified.

Panel-specific source · Source dated September 9, 2026

Report

Partially confirmed

Results are emailed when available. Guided Optimization is a separate program with treatment eligibility requirements. An included consultation, individual interpretation service, actual sample report, reference-range explanation and follow-up plan have not been established for this test purchase.

Panel-specific source · Source dated September 9, 2026

Under the hood

Follow the Evidence.

Every published claim should trace to a dated source. Missing evidence remains visible instead of being filled with assumptions.

Source 1Recorded for this record. Last source check September 9, 2026.View source
Source 2Recorded for this record. Last source check September 9, 2026.View source
Source 3Recorded for this record. Last source check September 9, 2026.View source
Source 4Recorded for this record. Last source check September 9, 2026.View source
Source 5Recorded for this record. Last source check September 9, 2026.View source
Source 6Recorded for this record. Last source check September 9, 2026.View source
Source 7Recorded for this record. Last source check September 9, 2026.View source
Source 8Recorded for this record. Last source check September 9, 2026.View source

True total cost

The Price. Plus the Details.

Pricing for Vitamin B12 & Folate (Folic Acid), Serum
ItemCurrent disclosed priceNote
Panel$50Verify the checkout total, shipping, and collection fees before ordering.
Venipuncture fee+ $10Per order, added at checkout. Checked October 1, 2026. Source
Total at checkout$60Listed price plus the required fees above, before tax and any optional services.
HSA/FSA paymentNot confirmedHSA/FSA payment eligibility has not been confirmed from provider documentation.
Optional servicesNot confirmedClinician review, subscriptions, and retesting discounts are listed only when documented.

Price status. This record shows disclosed pricing. Checkout costs can change and should be verified before purchase.

Your data

Your Data. Your Questions.

Privacy details are scored only when source documentation is available. Unconfirmed retention, deletion, research use, or marketing practices remain unconfirmed.

Reading the labels

What Has Been Checked?

Source collected

Evidence labels stay separate from the Test Grade. They show how much source support exists for the evaluation.

The balance

The Strengths. The Tradeoffs.

Strengths

  • Measures vitamin B12 and folate (folic acid) in serum for a focused nutrient-level assessment.
  • Order online for provider approval and blood collection at Quest.
  • The lab requisition is valid for six months from purchase.

Watch-outs

  • Marek adds a $10 venipuncture fee to orders of $199 or less and waives it on orders over $199. No additional payment is required at the lab. Lab sales are final and non-refundable.
  • Eligible US residents need a valid US driver license or state-issued ID. Hawaii and US territories are excluded, and orders are unavailable to residents of New York, New Jersey and Rhode Island.
  • Results typically arrive within 14 business days. Approximately two weeks is a general estimate that varies with test size and complexity; it is not a guaranteed calendar-day deadline.
  • Vitamin B12 and serum folate are named. The exact assay methods, laboratory, validation, reference intervals and analytical performance remain unassessed. High-dose biotin may interfere with the test results.
  • Two named entries are included: Vitamin B12 and Folate (Folic Acid), Serum. RBC folate, methylmalonic acid, homocysteine, a complete blood count and other nutrient measurements are not included.
  • Results are emailed when available. Guided Optimization is a separate program with treatment eligibility requirements. An included consultation, individual interpretation service, actual sample report, reference-range explanation and follow-up plan have not been established for this test purchase.
  • High-dose biotin can interfere with this test. The preparation instruction is to stop biotin supplements at least 72 hours before the blood draw.

Take it with you

The Test Truth Card

The key facts from this review in one compact card.

Same biomarkers, other sellers

Other Ways to Buy This Test.

3 other listings in the Labbrary catalog publish this exact biomarker list, with a lab draw.

Vitamin B12 (Cobalamin) and Folate Panel

Mito Health

Useful

Measures vitamin B12 and folate together in a blood sample for a focused check of these two nutrients.

Price
$15.08
Turnaround
2 days
See Labbrary reviewView Exact Panel on Provider Site
Labbrary+

Vitamin B12 (Cobalamin) and Folate Panel, Serum

Jason Health

Useful

Measures serum vitamin B12 and folate to help identify deficiencies associated with pernicious anemia, malabsorption, poor intake, or other causes.

Price
$48
Turnaround
6 days
See Labbrary reviewView Exact Panel on Provider Site
Labbrary+

Listed prices from the Labbrary catalog. Some sellers add fees at checkout, so compare the total before you pay. Updated October 2, 2026.

Keep deciding

Folate, RBC

Marek Health

Useful

Assess vitamin B9 status with red blood cell folate, folate in hemolysate and hematocrit listed in this blood-testing purchase.

Price
$54
Turnaround
14 days
See Labbrary reviewView Exact Panel on Provider Site
Labbrary+

Vitamin B12

Everlywell

Useful

Measures Vitamin B12 using a blood sample collected at a participating location. Order online, complete clinician review and access results through your account.

Price
$40
Turnaround
Not confirmed
See Labbrary reviewView Exact Panel on Provider Site
Labbrary+

Vitamin A and E Blood Test

Mito Health

Useful

Measures vitamin A and two forms of vitamin E to investigate deficiency or excessive intake of fat-soluble vitamins. Order online for a partner-laboratory blood draw when reviewing malabsorption or supplement use with a clinician.

Price
$29.25
Turnaround
6 days
See Labbrary reviewView Exact Panel on Provider Site
Labbrary+
Compare
Run a Pre-Buy AuditExplore All TestsFind My Best-Fit Tests

Verification History

September 9, 2026Recorded source date.Source collected

Affiliate disclosure. Some outbound links may earn Labbrary a commission. Affiliate relationships never influence a Test Grade.

LABBRARY / FREE NEWSLETTER

Keep Your
Curiosity Informed.

New tests. Meaningful updates. Smarter questions to ask before you buy. Get Labbrary's free newsletter in your inbox.

Free to join. No account needed. Privacy Policy