Tobramycin Lvl, Trough (TTR)

Department: Chemistry
Test Synonym(s): LAB38, TTR, TML, Nebcin, Tobrex
CPT Codes: 80200
Methodology: FPIA
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 Q24 > 1 mcg/mL; Q8/Q12 > 2mcg/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: Plasma
Alternate Specimen: Red top (no gel)
Pediatric Requirements: 2 dark green microtainers
Volume: 1 mL Plasma
Minimum Volume: 0.4 mL Plasma
Temperature: Refrigerated if not delivered to the lab immediately
Stability: Refrigerated: 2 days, Frozen at -20 C for longer storage
Reasons for Rejection: Hemolysis, low volume
Days Performed: Daily
Times Performed: Continuous
TAT: STAT: 1 hour; Routine: 2 hours
Significance: Trough serum levels generally - draw 30 minutes before next dose, following third dose. Provide date/time last dose charted, collection date/time, dosage amount/interval.

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