The goal of the project "Determination of detection times for a variety of B2-agonists (for method development, salbutamol and fenoterol) after therapeutic use" is to develop methods for the sensitive detection of B2-agonists in urine. Subsequently, these methods can also be used for determining detection times after administration of therapeutic doses of the preparations being marketed in Belgium. Moreover, it would give this information led to the drafting of a Minimum Required Performance Level (MRPL) to be achieved by the laboratories.