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Territories · Vitamin A Deficiency Test

Vitamin A Deficiency Test in Puerto Rico

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 Puerto Rico

Here is what you need before ordering and completing the Vitamin A Deficiency Test 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 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 Puerto Rico communities

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

San Juan1,915,105Vitamin A Deficiency TestAguadilla260,331Vitamin A Deficiency TestBayamón170,028Vitamin A Deficiency TestCarolina139,735Vitamin A Deficiency TestPonce124,719Vitamin A Deficiency TestArecibo123,499Vitamin A Deficiency TestSan Germán103,747Vitamin A Deficiency TestMayagüez93,426Vitamin A Deficiency TestYauco80,307Vitamin A Deficiency TestFajardo75,549Vitamin A Deficiency TestCaguas74,502Vitamin A Deficiency TestJuana Díaz71,759Vitamin A Deficiency TestGuaynabo70,542Vitamin A Deficiency TestFlorida69,427Vitamin A Deficiency TestGuayama65,343Vitamin A Deficiency TestTrujillo Alto44,203Vitamin A Deficiency TestCataño23,536Vitamin A Deficiency TestVega Baja23,527Vitamin A Deficiency TestHumacao17,607Vitamin A Deficiency TestCandelaria15,498Vitamin A Deficiency TestCayey14,052Vitamin A Deficiency TestDorado13,008Vitamin A Deficiency TestRío Grande12,216Vitamin A Deficiency TestCanóvanas12,211Vitamin A Deficiency TestManatí12,207Vitamin A Deficiency TestCaño Martin Peña12,112Vitamin A Deficiency TestHormigueros11,358Vitamin A Deficiency TestSabana Grande11,128Vitamin A Deficiency TestCoamo10,508Vitamin A Deficiency TestIsabela10,457Vitamin A Deficiency TestCabo Rojo10,011Vitamin A Deficiency TestCorozal9,986Vitamin A Deficiency TestPájaros9,713Vitamin A Deficiency TestVega Alta9,457Vitamin A Deficiency TestSan Lorenzo8,628Vitamin A Deficiency TestSan Sebastián8,568Vitamin A Deficiency TestAibonito8,532Vitamin A Deficiency TestArroyo8,438Vitamin A Deficiency TestJuncos8,174Vitamin A Deficiency TestLuquillo7,898Vitamin A Deficiency TestSan Isidro7,613Vitamin A Deficiency TestUtuado7,336Vitamin A Deficiency TestSabana Seca7,330Vitamin A Deficiency TestSan Antonio7,311Vitamin A Deficiency TestPuerto Real6,966Vitamin A Deficiency TestGurabo6,882Vitamin A Deficiency TestYabucoa6,466Vitamin A Deficiency TestCidra6,139Vitamin A Deficiency TestGuánica6,042Vitamin A Deficiency TestCeiba5,876Vitamin A Deficiency TestLas Piedras5,785Vitamin A Deficiency TestQuebradillas5,528Vitamin A Deficiency TestPeñuelas5,497Vitamin A Deficiency TestNaguabo5,487Vitamin A Deficiency TestLajas5,453Vitamin A Deficiency TestSanta Isabel5,433Vitamin A Deficiency TestLares5,203Vitamin A Deficiency TestAñasco5,042Vitamin A Deficiency TestCoco4,942Vitamin A Deficiency TestSalinas4,771Vitamin A Deficiency Test