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Pacific · Vitamin A Deficiency Test

Vitamin A Deficiency Test in California

This page explains the vitamin a deficiency test, what it measures, and how to order it. This blood test measures vitamin A levels to help evaluate for a deficiency. It is typically ordered when symptoms suggest low vitamin A or when a person has risk factors.

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 A Deficiency Test 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
Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
Preparation
Preparation instructions can vary, so follow the specific directions provided by the collection lab. Typically, no special preparation is needed, but the lab will confirm any requirements.
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 A deficiency test is a blood test that measures the amount of retinol, the primary form of vitamin A, in the blood. It helps assess whether vitamin A stores are adequate for normal vision, immune function, and skin health.

What it measures

  • Retinol — reflects circulating vitamin A levels
  • Retinol-binding protein — indicates vitamin A transport capacity
  • Total vitamin A — may include other retinoid forms

What the test involves

A healthcare professional collects a blood sample, usually from a vein in your arm, using a standard blood draw. 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 such as night blindness, dry eyes, or frequent infections that could indicate low vitamin A. It may also be ordered for individuals with conditions that affect nutrient absorption or those with limited dietary intake.

Preparation

Preparation instructions can vary, so follow the specific directions provided by the collection lab. Typically, no special preparation is needed, but the lab will confirm any requirements.

How results are reported

Results are reported as a numerical value that your clinician interprets. Reference ranges can differ between laboratories, so the lab's own range should be used for context.

Before you go

  • Whether fasting is required before the blood draw
  • Any medications or supplements that might affect results
  • The expected turnaround time for results

Cities

Vitamin A Deficiency Test in California communities

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

Los Angeles12,121,244Vitamin A Deficiency TestSan Francisco3,290,197Vitamin A Deficiency TestSan Diego3,084,174Vitamin A Deficiency TestRiverside2,022,285Vitamin A Deficiency TestSacramento1,924,167Vitamin A Deficiency TestSan Jose1,729,879Vitamin A Deficiency TestFresno719,558Vitamin A Deficiency TestConcord640,270Vitamin A Deficiency TestBakersfield590,845Vitamin A Deficiency TestMission Viejo588,540Vitamin A Deficiency TestMurrieta509,526Vitamin A Deficiency TestLong Beach466,565Vitamin A Deficiency TestOakland437,548Vitamin A Deficiency TestStockton406,822Vitamin A Deficiency TestVictorville389,060Vitamin A Deficiency TestModesto382,994Vitamin A Deficiency TestLancaster381,732Vitamin A Deficiency TestOxnard366,330Vitamin A Deficiency TestIndio361,831Vitamin A Deficiency TestAnaheim348,204Vitamin A Deficiency TestAntioch322,796Vitamin A Deficiency TestSanta Rosa314,196Vitamin A Deficiency TestSanta Ana313,818Vitamin A Deficiency TestIrvine297,868Vitamin A Deficiency TestSanta Clarita275,230Vitamin A Deficiency TestChula Vista274,818Vitamin A Deficiency TestVisalia249,804Vitamin A Deficiency TestFremont231,502Vitamin A Deficiency TestSan Bernardino220,821Vitamin A Deficiency TestThousand Oaks211,045Vitamin A Deficiency TestMoreno Valley208,371Vitamin A Deficiency TestFontana208,087Vitamin A Deficiency TestSalinas199,290Vitamin A Deficiency TestHuntington Beach198,735Vitamin A Deficiency TestSanta Barbara198,240Vitamin A Deficiency TestGlendale196,512Vitamin A Deficiency TestHemet191,170Vitamin A Deficiency TestVallejo181,882Vitamin A Deficiency TestElk Grove175,510Vitamin A Deficiency TestOntario175,223Vitamin A Deficiency TestOceanside174,461Vitamin A Deficiency TestRancho Cucamonga173,946Vitamin A Deficiency TestGarden Grove172,708Vitamin A Deficiency TestPalmdale167,987Vitamin A Deficiency TestSanta Cruz165,933Vitamin A Deficiency TestHayward162,254Vitamin A Deficiency TestCorona157,844Vitamin A Deficiency TestMerced157,617Vitamin A Deficiency TestSunnyvale155,550Vitamin A Deficiency TestPomona151,592Vitamin A Deficiency TestEscondido151,443Vitamin A Deficiency TestTorrance147,156Vitamin A Deficiency TestRoseville145,687Vitamin A Deficiency TestFairfield145,163Vitamin A Deficiency TestFullerton142,964Vitamin A Deficiency TestSanta Maria142,230Vitamin A Deficiency TestOrange139,195Vitamin A Deficiency TestPasadena138,771Vitamin A Deficiency TestYuba City129,536Vitamin A Deficiency TestSanta Clara127,922Vitamin A Deficiency Test