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Test Code LAB805 Magnesium Ionized, Whole Blood

Important Note

This test will be discontinued on July 2, 2018 due to low volume.

Test Name Alias

Magnesium Ionized Whole Blood Level | Mg Ionized | BW OR-Ionized Mg Level | OR- Ionized Mg Level | 9065

Collection Instructions

Specimen Collection: Blood


Container(s): 4.0 mL Green Top Lithium Heparin, non gel


Preferred Volume to Collect: 4.0 mL

Minimum Volume to Collect: 2.0 mL

Neonate Volume to Collect: 2.0 mL

Capillary collect ok? N

Microtainer acceptable: N


Collection Instructions:

  • Do not expose to air.
  • Do not store on ice.
  • After collection, gently invert tube 8-10 times

  • Must be analyzed within 30 minutes - deliver to laboratory immediately.

Specimen may only be collected at Grand Rapids Medical Center (Butterworth and Helen DeVos Children’s Hospital).


Outpatient Specimen Collection: For optimal specimen integrity, we recommend that the specimen be drawn at the Spectrum Health Laboratories located at 35 Michigan or Butterworth Hospital, in downtown Grand Rapids.

Processing Instructions (Laboratory, Outpatient or Off-site collection)

Processed Specimen: Whole Blood


Centrifuge/Spin: N

Aliquot: N


Transport Temperature: Ambient

Test Frequency

Available 24 hours, usual TAT 1 day.

Reference Range

0.53 – 0.67 mmol/L

Performing Department


Performing Department Laboratory Location

Spectrum Health Regional Laboratory (SHRL), Grand Rapids, MI


ion selective electrode



CDM Code


Interface Order Alias



Magnesium Ionized: 2600-5

Reviewed Date