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Territories · Selenium Urine Test – Deficiency Testing

Selenium Urine Test – Deficiency Testing in Puerto Rico

This page explains the selenium urine test – deficiency testing, what it measures, and how to order it. A selenium urine test measures how much selenium is excreted in urine, which can reflect recent exposure or body levels. It is used to monitor industrial exposure or help evaluate a possible deficiency.

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 Urine 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
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 depends on the type of urine collection and the laboratory's procedures. Follow the specific instructions provided by the collection lab.
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 measures the amount of selenium in a urine sample. Selenium is a trace element that acts as an antioxidant and supports thyroid and immune function. Urine selenium mainly reflects recent intake and excretion, so it is often used alongside other tests.

What it measures

  • Urine selenium — reflects recent selenium intake and excretion
  • Creatinine (if measured) — helps adjust for urine concentration
  • Collection volume (for 24-hour) — used to calculate total daily excretion

What the test involves

You will collect a urine sample, usually a spot sample or a 24-hour collection, following the lab's instructions. The sample is then sent to the laboratory for analysis.

Why it is often ordered

A clinician may order this test to monitor workplace exposure to selenium or to help assess whether selenium levels are too low. It can also be used to follow up on abnormal findings from other tests.

Preparation

Preparation depends on the type of urine collection and the laboratory's procedures. Follow the specific instructions provided by the collection lab.

How results are reported

Results are reported as a concentration or total amount of selenium in the urine, often with a reference range. Reference ranges vary by laboratory and by the type of collection, so your result should be interpreted in that context.

Before you go

  • Whether a spot or 24-hour urine collection is required
  • Any dietary or supplement restrictions before collection
  • How and when to return the sample to the lab

Cities

Selenium Urine Test – Deficiency Testing in Puerto Rico communities

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

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