1. A method for determining a capture threshold for one or more vectors of a multi-vector medical system, the method comprising: delivering electrical stimulation at a first voltage to each vector in a first set of two or more vectors of the multi-vector medical system; determining whether the delivered electrical stimulation at the first voltage resulted in capture for each of the vectors in the first set of two or more vectors; subsequently identifying those vectors of the first set of two or more vectors that were determined to result in capture as a second set of vectors and excluding those vectors that failed to cause capture from the second set of vectors; delivering electrical stimulation at a second voltage that is lower than the first voltage to each vector in the second set of vectors; and determining whether the delivered electrical stimulation at the second voltage resulted in capture for each of the vectors in the second set of vectors.