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Territories · Selenium Blood Test – Deficiency Testing

Selenium Blood Test – Deficiency Testing in Puerto Rico

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 Puerto Rico

Here is what you need before ordering and completing the Selenium Blood Test – Deficiency Testing in PR. 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 Puerto Rico communities

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

San Juan1,915,105Selenium Blood Test – Deficiency TestingAguadilla260,331Selenium Blood Test – Deficiency TestingBayamón170,028Selenium Blood Test – Deficiency TestingCarolina139,735Selenium Blood Test – Deficiency TestingPonce124,719Selenium Blood Test – Deficiency TestingArecibo123,499Selenium Blood Test – Deficiency TestingSan Germán103,747Selenium Blood Test – Deficiency TestingMayagüez93,426Selenium Blood Test – Deficiency TestingYauco80,307Selenium Blood Test – Deficiency TestingFajardo75,549Selenium Blood Test – Deficiency TestingCaguas74,502Selenium Blood Test – Deficiency TestingJuana Díaz71,759Selenium Blood Test – Deficiency TestingGuaynabo70,542Selenium Blood Test – Deficiency TestingFlorida69,427Selenium Blood Test – Deficiency TestingGuayama65,343Selenium Blood Test – Deficiency TestingTrujillo Alto44,203Selenium Blood Test – Deficiency TestingCataño23,536Selenium Blood Test – Deficiency TestingVega Baja23,527Selenium Blood Test – Deficiency TestingHumacao17,607Selenium Blood Test – Deficiency TestingCandelaria15,498Selenium Blood Test – Deficiency TestingCayey14,052Selenium Blood Test – Deficiency TestingDorado13,008Selenium Blood Test – Deficiency TestingRío Grande12,216Selenium Blood Test – Deficiency TestingCanóvanas12,211Selenium Blood Test – Deficiency TestingManatí12,207Selenium Blood Test – Deficiency TestingCaño Martin Peña12,112Selenium Blood Test – Deficiency TestingHormigueros11,358Selenium Blood Test – Deficiency TestingSabana Grande11,128Selenium Blood Test – Deficiency TestingCoamo10,508Selenium Blood Test – Deficiency TestingIsabela10,457Selenium Blood Test – Deficiency TestingCabo Rojo10,011Selenium Blood Test – Deficiency TestingCorozal9,986Selenium Blood Test – Deficiency TestingPájaros9,713Selenium Blood Test – Deficiency TestingVega Alta9,457Selenium Blood Test – Deficiency TestingSan Lorenzo8,628Selenium Blood Test – Deficiency TestingSan Sebastián8,568Selenium Blood Test – Deficiency TestingAibonito8,532Selenium Blood Test – Deficiency TestingArroyo8,438Selenium Blood Test – Deficiency TestingJuncos8,174Selenium Blood Test – Deficiency TestingLuquillo7,898Selenium Blood Test – Deficiency TestingSan Isidro7,613Selenium Blood Test – Deficiency TestingUtuado7,336Selenium Blood Test – Deficiency TestingSabana Seca7,330Selenium Blood Test – Deficiency TestingSan Antonio7,311Selenium Blood Test – Deficiency TestingPuerto Real6,966Selenium Blood Test – Deficiency TestingGurabo6,882Selenium Blood Test – Deficiency TestingYabucoa6,466Selenium Blood Test – Deficiency TestingCidra6,139Selenium Blood Test – Deficiency TestingGuánica6,042Selenium Blood Test – Deficiency TestingCeiba5,876Selenium Blood Test – Deficiency TestingLas Piedras5,785Selenium Blood Test – Deficiency TestingQuebradillas5,528Selenium Blood Test – Deficiency TestingPeñuelas5,497Selenium Blood Test – Deficiency TestingNaguabo5,487Selenium Blood Test – Deficiency TestingLajas5,453Selenium Blood Test – Deficiency TestingSanta Isabel5,433Selenium Blood Test – Deficiency TestingLares5,203Selenium Blood Test – Deficiency TestingAñasco5,042Selenium Blood Test – Deficiency TestingCoco4,942Selenium Blood Test – Deficiency TestingSalinas4,771Selenium Blood Test – Deficiency Testing