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Pacific · Vitamin C Test – Vitamin Deficiency Testing

Vitamin C Test – Vitamin Deficiency Testing in California

Below is a plain-language overview of the vitamin c test – vitamin deficiency testing. A vitamin C test measures the amount of vitamin C in your blood to help evaluate whether your levels are adequate. It is typically used when a deficiency is suspected based on symptoms or dietary history.

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 C Test – Vitamin Deficiency Testing 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 follow the specific directions provided by the collection laboratory. This may include fasting or avoiding certain foods or supplements before the test.
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

This blood test quantifies the concentration of vitamin C, also known as ascorbic acid, in your bloodstream. It is used to assess vitamin C status and can help identify a deficiency. The test is not a routine screening tool for most healthy individuals.

What it measures

  • Vitamin C (ascorbic acid) — reflects the amount of vitamin C circulating in the blood

What the test involves

The test requires a standard blood draw, usually from a vein in your arm. The sample is then sent to a laboratory for analysis.

Why it is often ordered

A clinician may order this test if you have symptoms that could suggest a vitamin C deficiency, such as easy bruising, bleeding gums, or poor wound healing. It may also be ordered for individuals with limited dietary intake or certain medical conditions that affect nutrient absorption.

Preparation

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

How results are reported

Results are reported as a numerical value that indicates your vitamin C level. Reference ranges can differ between laboratories, so your result should be interpreted in the context of the range provided by the testing lab.

Before you go

  • Whether fasting is required before the test
  • Any medications or supplements that might affect results
  • The specific reference range used by the testing laboratory

Cities

Vitamin C Test – Vitamin Deficiency Testing in California communities

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

Los Angeles12,121,244Vitamin C Test – Vitamin Deficiency TestingSan Francisco3,290,197Vitamin C Test – Vitamin Deficiency TestingSan Diego3,084,174Vitamin C Test – Vitamin Deficiency TestingRiverside2,022,285Vitamin C Test – Vitamin Deficiency TestingSacramento1,924,167Vitamin C Test – Vitamin Deficiency TestingSan Jose1,729,879Vitamin C Test – Vitamin Deficiency TestingFresno719,558Vitamin C Test – Vitamin Deficiency TestingConcord640,270Vitamin C Test – Vitamin Deficiency TestingBakersfield590,845Vitamin C Test – Vitamin Deficiency TestingMission Viejo588,540Vitamin C Test – Vitamin Deficiency TestingMurrieta509,526Vitamin C Test – Vitamin Deficiency TestingLong Beach466,565Vitamin C Test – Vitamin Deficiency TestingOakland437,548Vitamin C Test – Vitamin Deficiency TestingStockton406,822Vitamin C Test – Vitamin Deficiency TestingVictorville389,060Vitamin C Test – Vitamin Deficiency TestingModesto382,994Vitamin C Test – Vitamin Deficiency TestingLancaster381,732Vitamin C Test – Vitamin Deficiency TestingOxnard366,330Vitamin C Test – Vitamin Deficiency TestingIndio361,831Vitamin C Test – Vitamin Deficiency TestingAnaheim348,204Vitamin C Test – Vitamin Deficiency TestingAntioch322,796Vitamin C Test – Vitamin Deficiency TestingSanta Rosa314,196Vitamin C Test – Vitamin Deficiency TestingSanta Ana313,818Vitamin C Test – Vitamin Deficiency TestingIrvine297,868Vitamin C Test – Vitamin Deficiency TestingSanta Clarita275,230Vitamin C Test – Vitamin Deficiency TestingChula Vista274,818Vitamin C Test – Vitamin Deficiency TestingVisalia249,804Vitamin C Test – Vitamin Deficiency TestingFremont231,502Vitamin C Test – Vitamin Deficiency TestingSan Bernardino220,821Vitamin C Test – Vitamin Deficiency TestingThousand Oaks211,045Vitamin C Test – Vitamin Deficiency TestingMoreno Valley208,371Vitamin C Test – Vitamin Deficiency TestingFontana208,087Vitamin C Test – Vitamin Deficiency TestingSalinas199,290Vitamin C Test – Vitamin Deficiency TestingHuntington Beach198,735Vitamin C Test – Vitamin Deficiency TestingSanta Barbara198,240Vitamin C Test – Vitamin Deficiency TestingGlendale196,512Vitamin C Test – Vitamin Deficiency TestingHemet191,170Vitamin C Test – Vitamin Deficiency TestingVallejo181,882Vitamin C Test – Vitamin Deficiency TestingElk Grove175,510Vitamin C Test – Vitamin Deficiency TestingOntario175,223Vitamin C Test – Vitamin Deficiency TestingOceanside174,461Vitamin C Test – Vitamin Deficiency TestingRancho Cucamonga173,946Vitamin C Test – Vitamin Deficiency TestingGarden Grove172,708Vitamin C Test – Vitamin Deficiency TestingPalmdale167,987Vitamin C Test – Vitamin Deficiency TestingSanta Cruz165,933Vitamin C Test – Vitamin Deficiency TestingHayward162,254Vitamin C Test – Vitamin Deficiency TestingCorona157,844Vitamin C Test – Vitamin Deficiency TestingMerced157,617Vitamin C Test – Vitamin Deficiency TestingSunnyvale155,550Vitamin C Test – Vitamin Deficiency TestingPomona151,592Vitamin C Test – Vitamin Deficiency TestingEscondido151,443Vitamin C Test – Vitamin Deficiency TestingTorrance147,156Vitamin C Test – Vitamin Deficiency TestingRoseville145,687Vitamin C Test – Vitamin Deficiency TestingFairfield145,163Vitamin C Test – Vitamin Deficiency TestingFullerton142,964Vitamin C Test – Vitamin Deficiency TestingSanta Maria142,230Vitamin C Test – Vitamin Deficiency TestingOrange139,195Vitamin C Test – Vitamin Deficiency TestingPasadena138,771Vitamin C Test – Vitamin Deficiency TestingYuba City129,536Vitamin C Test – Vitamin Deficiency TestingSanta Clara127,922Vitamin C Test – Vitamin Deficiency Testing