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Mountain West · Magnesium RBC Test – Deficiency Testing

Magnesium RBC Test – Deficiency Testing in Colorado

Below is a plain-language overview of the magnesium rbc test – deficiency testing. A magnesium RBC test measures the amount of magnesium inside red blood cells, which some clinicians consider a more accurate reflection of body magnesium status than a serum magnesium test.

Sample typeBlood and/or urine at a collection lab
ReferralIncluded — no referral from your own doctor needed

Lab requirements in Colorado

Here is what you need before ordering and completing the Magnesium RBC Test – Deficiency Testing in CO. 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
Preparation instructions can vary, so follow the specific directions provided by the collection laboratory. This may include fasting or avoiding certain supplements before the test.
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 evaluates the magnesium content within red blood cells rather than in the liquid portion of blood. Because most magnesium is stored inside cells, this test may provide a better picture of overall magnesium levels. It is sometimes used when a standard serum magnesium test is normal but a deficiency is still suspected.

What it measures

  • Magnesium (RBC) — Reflects the amount of magnesium stored inside red blood cells

What the test involves

A healthcare professional collects a small sample of blood, 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 to assess magnesium status when symptoms such as muscle cramps, weakness, or irregular heartbeat suggest a possible deficiency. It can also be used to monitor conditions or treatments that affect magnesium levels.

Preparation

Preparation instructions can vary, so follow the specific directions provided by the collection laboratory. This may include fasting or avoiding certain supplements before the test.

How results are reported

Results are typically reported as a number that is compared to a reference range established by the testing laboratory. Reference ranges can differ between laboratories, so your results should be interpreted in the context of the lab's own range.

Before you go

  • Whether fasting is required before the test
  • Any medications or supplements that might affect results
  • The specific reference range used by the testing laboratory

Cities

Magnesium RBC Test – Deficiency Testing in Colorado communities

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

Denver2,650,725Magnesium RBC Test – Deficiency TestingColorado Springs628,808Magnesium RBC Test – Deficiency TestingAurora383,496Magnesium RBC Test – Deficiency TestingFort Collins301,596Magnesium RBC Test – Deficiency TestingLakewood155,608Magnesium RBC Test – Deficiency TestingPueblo142,727Magnesium RBC Test – Deficiency TestingThornton140,538Magnesium RBC Test – Deficiency TestingGreeley135,270Magnesium RBC Test – Deficiency TestingGrand Junction134,074Magnesium RBC Test – Deficiency TestingArvada122,903Magnesium RBC Test – Deficiency TestingBoulder120,818Magnesium RBC Test – Deficiency TestingWestminster115,535Magnesium RBC Test – Deficiency TestingCentennial107,972Magnesium RBC Test – Deficiency TestingLongmont104,035Magnesium RBC Test – Deficiency TestingHighlands Ranch103,238Magnesium RBC Test – Deficiency TestingLafayette99,475Magnesium RBC Test – Deficiency TestingLoveland75,938Magnesium RBC Test – Deficiency TestingBroomfield72,697Magnesium RBC Test – Deficiency TestingCastle Rock71,037Magnesium RBC Test – Deficiency TestingCommerce City61,516Magnesium RBC Test – Deficiency TestingParker57,311Magnesium RBC Test – Deficiency TestingLittleton45,465Magnesium RBC Test – Deficiency TestingSecurity-Widefield40,158Magnesium RBC Test – Deficiency TestingBrighton39,895Magnesium RBC Test – Deficiency TestingNorthglenn37,899Magnesium RBC Test – Deficiency TestingDakota Ridge34,361Magnesium RBC Test – Deficiency TestingKen Caryl33,889Magnesium RBC Test – Deficiency TestingEnglewood33,500Magnesium RBC Test – Deficiency TestingPueblo West32,991Magnesium RBC Test – Deficiency TestingWheat Ridge32,340Magnesium RBC Test – Deficiency TestingWindsor31,972Magnesium RBC Test – Deficiency TestingFountain29,495Magnesium RBC Test – Deficiency TestingErie29,367Magnesium RBC Test – Deficiency TestingColumbine25,924Magnesium RBC Test – Deficiency TestingEvans21,727Magnesium RBC Test – Deficiency TestingFour Square Mile21,723Magnesium RBC Test – Deficiency TestingLouisville21,091Magnesium RBC Test – Deficiency TestingClifton20,122Magnesium RBC Test – Deficiency TestingMontrose20,098Magnesium RBC Test – Deficiency TestingSherrelwood20,069Magnesium RBC Test – Deficiency TestingGolden20,041Magnesium RBC Test – Deficiency TestingDurango18,953Magnesium RBC Test – Deficiency TestingCimarron Hills18,619Magnesium RBC Test – Deficiency TestingCañon City17,157Magnesium RBC Test – Deficiency TestingFort Carson16,743Magnesium RBC Test – Deficiency TestingJohnstown16,596Magnesium RBC Test – Deficiency TestingWelby16,260Magnesium RBC Test – Deficiency TestingFirestone15,949Magnesium RBC Test – Deficiency TestingGreenwood Village15,548Magnesium RBC Test – Deficiency TestingBlack Forest14,375Magnesium RBC Test – Deficiency TestingFrederick14,127Magnesium RBC Test – Deficiency TestingFederal Heights14,111Magnesium RBC Test – Deficiency TestingSterling13,976Magnesium RBC Test – Deficiency TestingLone Tree13,701Magnesium RBC Test – Deficiency TestingFruita13,296Magnesium RBC Test – Deficiency TestingSuperior13,283Magnesium RBC Test – Deficiency TestingSteamboat Springs13,193Magnesium RBC Test – Deficiency TestingFort Morgan11,483Magnesium RBC Test – Deficiency TestingCherry Creek11,389Magnesium RBC Test – Deficiency TestingCastle Pines11,296Magnesium RBC Test – Deficiency Testing