Sign in →

Test Code MG Magnesium, Plasma or Serum

Methodology

Xylidyl blue

Performing Laboratory

Munson Healthcare Laboratories

Specimen Requirements

Submit only 1 of the following specimens:

 

Plasma

Container/Tube: Green-top (heparin) gel tube

Specimen Volume: 0.5 mL of heparinized plasma
Transport Temperature: Refrigerate
Collection Instructions: Centrifuge within 2 hours of draw. Forward promptly.

Note: 1. Medicare frequency limitations exist for this test in addition to diagnosis requirements. See Advance Beneficiary Notice of Noncoverage (ABN) form in Special Instructions.

2. Indicate plasma.

3. Label specimen appropriately (plasma).


Serum
Container/Tube: Gold-top serum gel tube

Specimen Volume: 0.5 mL of serum
Transport Temperature: Refrigerate
Collection Instructions: Centrifuge within 2 hours of draw. Forward promptly.

Note: 1. Medicare frequency limitations exist for this test in addition to diagnosis requirements. See Advance Beneficiary Notice of Noncoverage (ABN) form in Special Instructions.

2. Indicate serum.

3. Label specimen appropriately (serum).

Reference Values

1.8-2.5 mg/dL

Critical value (automatic call-back):

Pediatric patients up to 21 years old:  ≤ 1.0 mg/dL, ≥ 3.5 mg/dL

Patients 21 years and older:  ≤ 1.0 mg/dL, ≥ 4.5 mg/dL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

83735