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Test Code 1932 Gentamicin, Random, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory


Quantitative Microsphere System (QMS)

Testing Algorithm:

If the gentamicin value is a critical result , #1883 Potassium, Plasma will be performed, at an additional charge. 

Literature References:

Package Insert: Gentamicin GENT by Thermo Scientific 09/2014.


Specimen Requirements

Specimen Type: Plasma

Container/Tube: Dark-green top (lithium heparin)

Specimen Volume: Full tube

1 mint green-top (lithium heparin) tube

Additional Information: Date and time of draw are required.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour
Routine: 4 hours

Reference Values

Setting Target Range
Unspecified indication N/A
UTI/GPC synergy* N/A
Systemic illness N/A
Sepsis N/A
Physician alert value (automatic call-back) ≥21 mcg/mL

*UTI/GPC synergy refers to the synergistic effect of aminoglycosides with other antibiotics in treating urinary tract infections caused by gram-positive cocci (eg, Enterococcus).

Note: See Dosage Adjustment of Aminoglycoside Antibiotics Based on Drug Level Monitoring in Special Instructions.

Literature Reference:

Casabar E, BJH Antibiotic Utilization Review Subcommittee. Aminoglycoside dosing: Extended interval and traditional. BJH Pharmacy’s Toolbook (2005).

Test Classification and CPT Coding


84132-Potassium (if appropriate)

Additional Information

For BJH Laboratory Use Only
Alternate Tube:

Dark-green top (lithium heparin)

Red-top tube

Separator gel tube is acceptable but not preferred.

Analyte Stability:

Ambient: 8 hours

2° C to 8° C: ≤48 hours

≤-20° C: >48 hours

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days.

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Gentamicin, Random, Plasma 3664-0