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Magnesium, Plasma or Serum
Test Code789
CPT Codes
83735
Preferred Specimen
Submit only 1 of the following specimens:
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate serum. 2. Label specimen appropriately (serum).
Minimum Volume
Pediatric volume: 0.2 mL
Transport Temperature
Refrigerate
Methodology
Methylthymol Blue
Setup Schedule
Monday through Sunday
Reference Range
1.8-2.4 mg/dL
Critical values (automatic call-back): <1.2 mg/dL or >8.4 mg/dL
Critical values (automatic call-back): <1.2 mg/dL or >8.4 mg/dL
Clinical Significance
Useful for evaluation of magnesium metabolism, investigation of electrolyte status, and work-up of nephrolithiasis.
Performed By
CoxHealth
