An apparatus comprises a stimulus circuit, a cardiac signal sensing circuit, and a control circuit. The stimulus circuit provides electrical pulse energy to a first pacing channel that includes a first left ventricular (LV) electrode as a cathode and a second pacing channel that includes a second LV electrode as a cathode. The cardiac signal sensing circuit senses cardiac signals using a first sensing channel that includes one of the first LV electrode or the second LV electrode. The control circuit includes a capture detection sub-circuit configured to: initiate delivery of electrical pulse energy to both the first pacing channel and the second pacing channel； sense cardiac depolarization of a ventricle using the first sensing channel； determine first and second cardiac capture pulse energy level thresholds for the first and second pacing channels respectively； and provide indications of the cardiac capture pulse energy level thresholds to a user or process.
