The answer to the crossword question “Heart test readout, for short” is EKG. EKG stands for electrocardiogram, which is a test that measures the electrical activity of the heart. The test is non-invasive and involves placing electrodes on the chest, arms, and legs to record the heart’s electrical signals. The resulting readout is a graph that shows the heart’s rhythm and can help diagnose various heart conditions. EKGs are commonly used in hospitals, clinics, and doctor’s offices to monitor heart health and detect any abnormalities.