Gentamicin Lvl, Trough (GTR)

Department: Chemistry
Test Synonym(s): LAB26, GTR, GML, Garamycin
CPT Codes: 80170
Methodology: PETINIA
Reference Range: 0 - 1 yr: <2 (reported from Cerner as <=1.9 mcg/mL for ages 0-18 yrs.-ksk). Supratherapeutic Trough Infant: Q24>2 mcg/mL; Q8/Q12>2 mcg/mL. 1 - 17 yrs: <2 (reported from Cerner as <=1.9 mcg/mL for ages 0-18 yrs.-ksk). Supratherapeutic Trough Peds: Q 24>1 mcg/mL; Q8/Q12>2 mcg/mL. 18 - 150 yrs: <0.5 (reported from Cerner as <=0.4 mcg/mL for ages 18-150 yrs.-ksk). Supratherapeutic Trough Adult: Q24>0.5 mcg/mL; Q8/Q12>2 mcg/mL
Tube Type: Dark green top (Sodium Heparin)
Specimen: Blood
Alternate Specimen: Red top (no gel)
Pediatric Requirements: 1 dark green top microtainer
Volume: 2 mL Blood
Minimum Volume: 0.25 mL
Temperature: Refrigerated if not delivered to the lab immediately
Stability: Refrigerated: 2 days, Frozen at -20 C for longer storage
Reasons for Rejection: Gross hemolysis
Days Performed: Daily
Times Performed: Continuous
TAT: STAT: 1 hour; Routine: 2 hours
Significance: Trough serum levels generally - draw 0-30 minutes before next dose, following third dose. *Date/time last dose charted. Collection date/time. Provide dosage amount/interval.

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