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22656 Gentamicin, Serum

Gentamicin, Serum
Test Code: GENTA
Synonyms/Keywords
Garamycin, U-Gentian​
Useful For
Gentamicin is frequently used (often in combination with penicillin or a cephalosporin) for the treatment of serious infections, particularly those due to Pseudomonas aeruginosa, Enterobacter, Klebsiella, Serratia, Citrobacter, Staphylococcus, and other species.​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​ Serum Separator Tube (SST) ​Red Top Tube (RTT)​ 0.5 mL​ 0.2 mL​ 0.6 mL whole blood​
Collection Processing Instructions
Transport to lab on wet ice.
Serum should be removed from cells within 60 minutes. 
Indicate exact draw time on tube.
 
Trough: draw specimen just prior to next dose.
Peak(IV): draw 30-60 min. after end of 30-minute infusion, or draw 15 min. after a 60-minute infusion.
Peak(IM): draw 30-60 min. after dosing.​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ ​ Refrigerate​ 2 hours​
Frozen​ 1 year​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Diagnostic Treatment Center​ ​Monday through Sunday​ ​Less than 2 hours​ ​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
​Eau Claire ​Monday through Sunday ​Less than 2 hours ​​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
​Lakeview Medical Center ​Monday through Sunday​ ​Less than 2 hours​ ​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
Marshfield​ Monday through Sunday​ Less than 2 hours​ Emit* 2000 Rate Assay/Beckman AU
​Minocqua​Monday through Sunday​Less than 2 hours​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
Reference Range Information
Performing Location Reference Range
All Performing Sites Therapeutic (Peak): 4.0-10.0 ug/mL
Safe level at Trough: <2.0 ug/mL
Subtherapeutic (Peak): <4.0 ug/mL ​
​See Critical Value List for list of current critical values ​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
80170 ​ ​ ​ ​ ​
Synonyms/Keywords
Garamycin, U-Gentian​
Ordering Applications
Ordering Application Description
​Centricity ​Gentamicin
​Cerner ​Gentamicin Level
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​ Serum Separator Tube (SST) ​Red Top Tube (RTT)​ 0.5 mL​ 0.2 mL​ 0.6 mL whole blood​
Collection Processing
Transport to lab on wet ice.
Serum should be removed from cells within 60 minutes. 
Indicate exact draw time on tube.
 
Trough: draw specimen just prior to next dose.
Peak(IV): draw 30-60 min. after end of 30-minute infusion, or draw 15 min. after a 60-minute infusion.
Peak(IM): draw 30-60 min. after dosing.​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ ​ Refrigerate​ 2 hours​
Frozen​ 1 year​
Useful For
Gentamicin is frequently used (often in combination with penicillin or a cephalosporin) for the treatment of serious infections, particularly those due to Pseudomonas aeruginosa, Enterobacter, Klebsiella, Serratia, Citrobacter, Staphylococcus, and other species.​
Reference Range Information
Performing Location Reference Range
All Performing Sites Therapeutic (Peak): 4.0-10.0 ug/mL
Safe level at Trough: <2.0 ug/mL
Subtherapeutic (Peak): <4.0 ug/mL ​
​See Critical Value List for list of current critical values ​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Diagnostic Treatment Center​ ​Monday through Sunday​ ​Less than 2 hours​ ​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
​Eau Claire ​Monday through Sunday ​Less than 2 hours ​​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
​Lakeview Medical Center ​Monday through Sunday​ ​Less than 2 hours​ ​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
Marshfield​ Monday through Sunday​ Less than 2 hours​ Emit* 2000 Rate Assay/Beckman AU
​Minocqua​Monday through Sunday​Less than 2 hours​Turbidimetric Inhibition Immunoassay Method/Siemens Dimension
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
80170 ​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.