Sign in →

Test Code MG Magnesium

Collection Container

Serum gel

Specimen Required

Serum

Other Acceptable Specimen Types

Heparinized plasma

Specimen Volume

1 mL

Minimum Specimen Volume

0.1 mL

Transport Temperature

Refrigerate

Specimen Stability

Room temperature: 7 days, Refrigerated: 7 days, Frozen: 1
year

Methodology

Spectrophotometric; xylidyl blue

Reference Ranges

13-19 mEq/L
Critical: <0.8 mEq/L or >4.5 mEq/L. If from: Obstetrics OR, Labor
and Delivery, or W1 or2: <0.8 mEq/L or >7.0 mEq/L

Turnaround Time

24 hours for routine, 1 hour for stats

Day(s) and Time(s) Performed

Test performed daily

Additional Information

Hemolysis will yield elevated results In very rare cases,
gammopathy, in particular type IgM (Waldenstrom ’s
macroglobulinemia), may cause unreliable results

CPT Code

83735

Units of Measure

mEQ/L

Criticals Results

<0.8 mEq/L or >4.5 mEq/L. If from: Obstetrics OR, Labor & Delivery, or W1 or2: <0.8 meq/l or >7.0 meq/L