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Pacific · Vitamin B1 Test – Vitamin Deficiency Tests

Vitamin B1 Test – Vitamin Deficiency Tests in California

Vitamin B1 Test – Vitamin Deficiency Tests can be ordered without a referral from your own doctor, and this guide covers what to expect. This blood test measures vitamin B1 (thiamine) levels to help assess whether a deficiency may be present. It is typically used when a clinician suspects inadequate intake or absorption.

Sample typeBlood and/or urine at a collection lab
ReferralIncluded — no referral from your own doctor needed

Lab requirements in California

Here is what you need before ordering and completing the Vitamin B1 Test – Vitamin Deficiency Tests in CA. Review each item and confirm the details with the collection lab.

Physician's order
Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
Fasting
Fasting is required for this test — follow the collection lab's instructions.
Preparation
Preparation instructions can vary, so it is important to follow the specific directions provided by the collection laboratory. This may include fasting or avoiding certain supplements…
Sample & visit
A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
Identification
Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
Turnaround
1-3 business days
Availability
Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.

Before you go

  • Order your test before visiting a lab, then use the requisition form in your account.
  • Print the requisition form, or fax it to the lab directly from your account.
  • No scheduling is needed — visit the collection lab during its normal business hours.
  • A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
  • Bring a government-issued photo ID in case the lab requests it.
  • Results are posted to your secure account within 1–3 business days.

Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.

What this test is

The vitamin B1 test is a laboratory analysis that quantifies thiamine in the blood. Thiamine is a water-soluble vitamin essential for energy metabolism and proper nerve function. The test can help identify low levels that may contribute to certain symptoms.

What it measures

  • Vitamin B1 (thiamine) — reflects the amount of thiamine present in the blood
  • Thiamine diphosphate — sometimes measured as the active form of thiamine in red blood cells
  • Transketolase activity — an enzyme function test that can indirectly indicate thiamine status

What the test involves

A standard blood draw is performed, usually from a vein in the arm, to collect a small sample for analysis. The sample is then processed by the laboratory to measure thiamine concentration.

Why it is often ordered

A clinician may order this test when a person has symptoms suggesting thiamine deficiency, such as confusion, tingling, or muscle weakness. It can also be used to monitor individuals with conditions that affect nutrient absorption or those with increased nutritional needs.

Preparation

Preparation instructions can vary, so it is important to follow the specific directions provided by the collection laboratory. This may include fasting or avoiding certain supplements before the test.

How results are reported

Results are typically reported as a numeric value that is compared to a reference range established by the testing laboratory. Reference ranges can differ between laboratories, so results should always be interpreted in the context of the lab that performed the test.

Before you go

  • Whether fasting is required before the test
  • If any medications or supplements should be avoided
  • The expected turnaround time for results

Cities

Vitamin B1 Test – Vitamin Deficiency Tests in California communities

Choose your city for local context and to order this test.

Los Angeles12,121,244Vitamin B1 Test – Vitamin Deficiency TestsSan Francisco3,290,197Vitamin B1 Test – Vitamin Deficiency TestsSan Diego3,084,174Vitamin B1 Test – Vitamin Deficiency TestsRiverside2,022,285Vitamin B1 Test – Vitamin Deficiency TestsSacramento1,924,167Vitamin B1 Test – Vitamin Deficiency TestsSan Jose1,729,879Vitamin B1 Test – Vitamin Deficiency TestsFresno719,558Vitamin B1 Test – Vitamin Deficiency TestsConcord640,270Vitamin B1 Test – Vitamin Deficiency TestsBakersfield590,845Vitamin B1 Test – Vitamin Deficiency TestsMission Viejo588,540Vitamin B1 Test – Vitamin Deficiency TestsMurrieta509,526Vitamin B1 Test – Vitamin Deficiency TestsLong Beach466,565Vitamin B1 Test – Vitamin Deficiency TestsOakland437,548Vitamin B1 Test – Vitamin Deficiency TestsStockton406,822Vitamin B1 Test – Vitamin Deficiency TestsVictorville389,060Vitamin B1 Test – Vitamin Deficiency TestsModesto382,994Vitamin B1 Test – Vitamin Deficiency TestsLancaster381,732Vitamin B1 Test – Vitamin Deficiency TestsOxnard366,330Vitamin B1 Test – Vitamin Deficiency TestsIndio361,831Vitamin B1 Test – Vitamin Deficiency TestsAnaheim348,204Vitamin B1 Test – Vitamin Deficiency TestsAntioch322,796Vitamin B1 Test – Vitamin Deficiency TestsSanta Rosa314,196Vitamin B1 Test – Vitamin Deficiency TestsSanta Ana313,818Vitamin B1 Test – Vitamin Deficiency TestsIrvine297,868Vitamin B1 Test – Vitamin Deficiency TestsSanta Clarita275,230Vitamin B1 Test – Vitamin Deficiency TestsChula Vista274,818Vitamin B1 Test – Vitamin Deficiency TestsVisalia249,804Vitamin B1 Test – Vitamin Deficiency TestsFremont231,502Vitamin B1 Test – Vitamin Deficiency TestsSan Bernardino220,821Vitamin B1 Test – Vitamin Deficiency TestsThousand Oaks211,045Vitamin B1 Test – Vitamin Deficiency TestsMoreno Valley208,371Vitamin B1 Test – Vitamin Deficiency TestsFontana208,087Vitamin B1 Test – Vitamin Deficiency TestsSalinas199,290Vitamin B1 Test – Vitamin Deficiency TestsHuntington Beach198,735Vitamin B1 Test – Vitamin Deficiency TestsSanta Barbara198,240Vitamin B1 Test – Vitamin Deficiency TestsGlendale196,512Vitamin B1 Test – Vitamin Deficiency TestsHemet191,170Vitamin B1 Test – Vitamin Deficiency TestsVallejo181,882Vitamin B1 Test – Vitamin Deficiency TestsElk Grove175,510Vitamin B1 Test – Vitamin Deficiency TestsOntario175,223Vitamin B1 Test – Vitamin Deficiency TestsOceanside174,461Vitamin B1 Test – Vitamin Deficiency TestsRancho Cucamonga173,946Vitamin B1 Test – Vitamin Deficiency TestsGarden Grove172,708Vitamin B1 Test – Vitamin Deficiency TestsPalmdale167,987Vitamin B1 Test – Vitamin Deficiency TestsSanta Cruz165,933Vitamin B1 Test – Vitamin Deficiency TestsHayward162,254Vitamin B1 Test – Vitamin Deficiency TestsCorona157,844Vitamin B1 Test – Vitamin Deficiency TestsMerced157,617Vitamin B1 Test – Vitamin Deficiency TestsSunnyvale155,550Vitamin B1 Test – Vitamin Deficiency TestsPomona151,592Vitamin B1 Test – Vitamin Deficiency TestsEscondido151,443Vitamin B1 Test – Vitamin Deficiency TestsTorrance147,156Vitamin B1 Test – Vitamin Deficiency TestsRoseville145,687Vitamin B1 Test – Vitamin Deficiency TestsFairfield145,163Vitamin B1 Test – Vitamin Deficiency TestsFullerton142,964Vitamin B1 Test – Vitamin Deficiency TestsSanta Maria142,230Vitamin B1 Test – Vitamin Deficiency TestsOrange139,195Vitamin B1 Test – Vitamin Deficiency TestsPasadena138,771Vitamin B1 Test – Vitamin Deficiency TestsYuba City129,536Vitamin B1 Test – Vitamin Deficiency TestsSanta Clara127,922Vitamin B1 Test – Vitamin Deficiency Tests