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Test Code LAB3400 OB Magnesium, Blood Level

Test Name Alias

OB Magnesium Blood Level, OB Mg Blood Level, obstetric | 365

Ordering Instructions

This test is limited to hospital obstetrical patients that have been administered intravenous magnesium sulfate.

This test is only for Obstectric (OBGYN) Patients.

Collection Instructions

Specimen Collection: Blood

 

Container(s): 4.5 mL Mint Green Top (Lithium Heparin Gel) or 5.0 mL Gold Top (Serum Separator-SST Gel)

Preferred Volume to Collect: 4.5 mL

Minimum Volume to Collect: 1.0 mL

Neonate Volume to Collect: Not applicable

Capillary collect ok? Yes

Microtainer acceptable: Yes

 

Collection Instructions:

  • This test is only for Obstectric (OBGYN) Patients.

  • After collection, gently invert tube 8-10 times.
  • Specimen should be processed within 2 hours – See Processing Instructions.

Processing Instructions (Laboratory, Outpatient or Off-site collection)

Processed Specimen: Plasma or Serum

Centrifuge/Spin: Yes

Aliquot: Yes

 

Processing Instructions:

  • Plasma is preferred specimen type
  • Green Tube/Plasma: Centrifuge after collection within 2 hours.
  • Gold Tube/Serum: Allow blood to clot for 30 minutes in a vertical position and centrifuge within 1 hour.

Transport Temperature: Refrigerate

Specimen Transport Temperature

Refrigerate

Specimen Stability

Ambient: 8 hours

Refrigerate: 72 hours

Frozen: aliquot plasma/serum for longer storage

Laboratory Retention: 72 hours

 

Inpatient SIL: 8 hours (green/gold)

Test Frequency

Available 24 hours, usual TAT 1 day.

Reference Range

4.8 – 8.0 mg/dL Therapeutic

8.0 – 12.0 mg/dL Loss of Deep Tendon Reflexes

10.0 – 12.0 mg/dL Somnolence

12.0 -16.0 mg/dL Respiratory difficulty/depression

15.0 -17.0 mg/dL muscular paralysis

> 18.0 mg/dL altered cardiac conduction

 

Laboratory Critical Values Table

Performing Department

CHEMISTRY

Performing Department Laboratory Location

Spectrum Health Regional Laboratory, Grand Rapids, MI
Spectrum Health Big Rapids Laboratory, Big Rapids, MI
Spectrum Health Blodgett Laboratory, Grand Rapids, MI
Spectrum Health Gerber Laboratory, Fremont, MI
Spectrum Health Kelsey Laboratory, Lakeview, MI
Spectrum Health Ludington Laboratory, Ludington, MI
Spectrum Health Pennock Laboratory, Hastings, MI
Spectrum Health Reed City Laboratory, Reed City, MI
Spectrum Health United Laboratory, Greenville, MI
Spectrum Health Zeeland Laboratory, Zeeland, MI

Methodology

Colorimetric

CPT

83735

CDM Code

4058271

Epic Test ID

1230102060

Interface Order Alias

11703

Additional Information

PolicyTech Procedure Reference #8530: Magnesium Sulfate Infusion in the Obstetrical Patient

Reviewed Date

1/11/2019