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Test Code Billings Clinic: 3995 Tobramycin, Random, Plasma or Serum

Performing Laboratory

Billings Clinic Laboratory: Chemistry

Useful For

Monitoring adequacy of serum concentration during tobramycin therapy

Methodology

Particle-enhance turbidimetric inhibition immunoassay (PETINIA)

Specimen Requirements

Submit only 1 of the following specimens:

Serum or plasma should be physically separated from cells as soon as possible with a maximum limit of two hours from the time of collection.

 

Plasma

  • Draw blood in a green-top (lithium heparin) tube(s).
  • Spin down and send 1.0 mL of heparinized plasma frozen.

 

Serum

  • Draw blood in a plain, red-top tube(s) or a serum gel tube(s).
  • Spin down and send 1.0 mL of serum frozen

Storage/Stability

Specimen Type Temperature Time
Plasma Refrigerated 3 days
  Frozen (preferred) 1 month
  Ambient 8 hours

 

Reject Due To

  • Specimens stored at room temperature > 8 hours
  • Hemolysis

Reference Values

Tobramycin Therapeutic Range:

Trough: 0.0-2.0 ug/mL

Peak: 4.0-8.0 ug/mL

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

80200 - Tobramycin

LOINC Code Information

Reporting Name LOINC Code
Tobramycin, Random 35670-9