Activity after test Resume taking any medications that were withheld before the test. Return to pretest activities right away. Use warm compresses if blood collects under the puncture site or if the area becomes tender, red or painful. Time before test results available Not available. Test results Test Values Test results are determined by liquid chromatography, spectrofluorometry and radio-immunoassay.
Normal Values Vary for each drug.
There is a narrow margin of safety between therapeutic and toxic levels of anti-arrhythmic drugs. Quantitative test monitors high and low drug concentrations to determine safe therapeutic range. During the test, waves are recorded with peak levels and trough levels. If these levels go too high, they can be toxic. If they fall too low, they are below the therapeutic range.