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Tests and diagnosis
By Mayo Clinic staffAn electrocardiogram (ECG) is the most commonly used test for bundle branch block. This noninvasive test is an electrical recording of your heart's activity. In this test, a technician will place probes on the skin of your chest that will show the patterns of electric impulses through your heart as wave patterns. Abnormalities in the waves may indicate the presence of bundle branch block. These electrical patterns can also point to whether the block is affecting the right or the left bundle branch.
It's also possible your doctor will discover you have a bundle branch block incidentally—meaning the condition could be found while you're having an ECG to diagnose another heart condition.
