Drugs & toxicology

Tobramycin (trough) unit converter

Aminoglycoside antibiotic trough level (nephro-/ototoxicity monitoring)

Also known as: Nebcin

Converter

Enter a value in any unit and all other units fill in.

µg/mL µmol/L mg/dL µg/dL µg/L nmol/L

Worked example

1 µg/mL (middle of the reference range) = 2.14 µmol/L

Conversion formulas

µmol/L	µmol/L = µg/mL × 2.139	µg/mL = µmol/L × 0.4675
mg/dL	mg/dL = µg/mL × 0.1	µg/mL = mg/dL × 10
µg/dL	µg/dL = µg/mL × 100	µg/mL = µg/dL × 0.01
µg/L	µg/L = µg/mL × 1000	µg/mL = µg/L × 0.001
nmol/L	nmol/L = µg/mL × 2139	µg/mL = nmol/L × 0.0004675

Reference range

Unit	Adults
µg/mL	0 – 2
µmol/L	0 – 4.278
mg/dL	0 – 0.2
µg/dL	0 – 200
µg/L	0 – 2000
nmol/L	0 – 4278

Source: FDA drug label (DailyMed): tobramycin injection · Last reviewed: 2026-10-14

Note from the source: Rising trough levels above 2 mcg/mL may indicate tissue accumulation; prolonged concentrations above 12 mcg/mL should be avoided (FDA label). A recent review aims for troughs below 1 mg/L

Frequently asked questions

How do I convert Tobramycin (trough) from µg/mL to mg/dL?

mg/dL = µg/mL × 0.1. In the other direction: µg/mL = mg/dL × 10.

What is the reference range of Tobramycin (trough)?

For adults the range is 0 – 2 µg/mL (FDA drug label (DailyMed): tobramycin injection). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Tobramycin (trough)?

Common units are µg/mL, µmol/L, mg/dL, µg/dL, µg/L, nmol/L.