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* MAGNESIUM, BLOOD

Mnemonic

MG

Synonym

Mg - Mg++

Specimen Collection Requirements

Patient Preparation

Fasting (8-14 hours) is recommended but not necessary.

Collect

Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red, or 3.0 mL mint green (lithium heparin, PST) top tube

Supply Item Number - 101235 or 101192

Handling

Allow serum to clot completely at room temperature (minimum: 30 minutes). Preferably, separate serum or plasma from cells before transport.

Preferred Volume

1.0 mL Serum/Plasma

Minimum Volume

0.25 mL Serum/Plasma (0.60 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed specimens, avoid using anticoagulants that bind magnesium such as EDTA, oxalate and citrate

Stability

AFTER SEPARATION FROM CELLS: Ambient (18-26°C): 24 hours; Refrigerated (2-8°C): 7 days; Frozen (≤ -20°C): 1 months

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Colorimetry

Reference Values

Reference Values

Critical Values

CPT Codes

83735

Last Updated: Friday, March 2, 2018 08:03:17 AM


Client Services: 503-413-1234