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Test Code LAB4096 GENTAMICIN LEVEL, TROUGH

Specimen Type

Preferred Sample:  Lithium Heparin Plasma (PST, Mint Green Top)
Alternative Sample:   Serum (SST, Gold, Corvac, Tiger, Red Top)

 

Collection Instructions

Draw trough specimen within 1 hour prior to next dose. Note time of dose and drawing.

Specimen Volume

1 mL

Minimum Volume

0.5 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Refrigerated: 7 days
Frozen: 14 days

Specimen Processing

Remove the plasma or serum from the cells, clot or gel as soon as possible before storing.

Method

Colorimetric

Reference Ranges

Gentamicin, µg/mL

Trough 0.5 - 2.0

Toxic: >2.0

Reporting Limit

0.5 - 20.0 ug/mL

Test Components

Gentamicin, Trough, µg/mL

CPT Codes

80170

Test Limitations

Studies have shown that therapeutic drug levels may be altered in serum/plasma that remains in contact with separator gel. Therapeutic drug levels collected in an SST or PST should be run within 24 hrs of collection.