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Test Code LAB103 Magnesium

Performing Lab

Arnot Ogden Medical Center/ Ira Davenport Memorial Hospital

Ordering Recommendations

Magnesium levels may be used to monitor preeclampsia patients being treated with magnesium sulfate, although in most cases monitoring clinical signs (respiratory rate and deep tendon reflexes) is adequate and blood magnesium levels are not required.

Collect

Serum or Plasma

Collection Device

Lithium Heparin Green Top Tube or Gold Top Tube

Specimen Handling

Centrifuge within 2 hours of collection.

Stability (from collection to initiation)

Room Temp

8 Hours
Refrigerated 1 week
Frozen Undetermined

Storage/Transport Temperature

Refrigerated

Specimen Volume

5 mL

Minimum Requirements

1 mL

Remarks

TURN AROUND TIME

STAT 1 Hour
Routine 8 Hours

Methodology

Timed Endpoint Absorbance

Start Date

9/13/2017

Last Review Date

07/08/2025

7/11/25 AP