Lab test requirements · preparation, ID, referral, and timing United States · 0 communities
LabRequirements Know what your test requires

Pacific · Selenium Blood Test – Deficiency Testing

Selenium Blood Test – Deficiency Testing in California

This page explains the selenium blood test – deficiency testing, what it measures, and how to order it. A selenium blood test measures the amount of selenium in your blood. It can help assess exposure or nutritional status.

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 Selenium Blood Test – 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
Your lab will provide specific instructions, which may include fasting or avoiding certain supplements. Always follow the collection lab's guidance.
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 test quantifies selenium, a trace mineral that acts as an antioxidant and supports thyroid and immune function. It is used to monitor industrial exposure or to evaluate a possible deficiency.

What it measures

  • Selenium — Reflects recent selenium intake and body status.
  • Selenium level — Used to assess deficiency or excess exposure.
  • Whole blood selenium — Measures selenium in whole blood, which may better reflect long-term status.

What the test involves

A healthcare professional collects a small sample of blood, 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 of deficiency, such as muscle weakness or hair loss, or if you work with selenium in an industrial setting. It can also be part of a nutritional assessment.

Preparation

Your lab will provide specific instructions, which may include fasting or avoiding certain supplements. Always follow the collection lab's guidance.

How results are reported

Results are reported as a concentration of selenium in your blood, often in micrograms per deciliter or micromoles per liter. Reference ranges vary by laboratory, so your result should be interpreted in the context of the lab's own range.

Before you go

  • Whether fasting is required before the test
  • If you should avoid certain supplements or foods
  • How and when you will receive your results

Cities

Selenium Blood Test – Deficiency Testing in California communities

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

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