Rifampin levels in daily practice: the accuracy of a single measurement.

Vanbrabant TJF, Dijkmans AC, den Hartigh J, Touw DJ, Arend SM

Measurement of rifampin levels is not part of routine practice. However, low levels are associated with failure of tuberculosis treatment. The clinical relevance of serum levels in daily practice is unclear. The objective was to evaluate rifampin serum concentrations and factors associated with insufficient concentrations.