What initial test can be performed to evaluate potential cardiogenic shock?

The initial test performed to evaluate potential cardiogenic shock is the EKG. In cases where cardiogenic shock is suspected, an electrocardiogram is crucial because it helps to identify acute myocardial infarction or other cardiac rhythm abnormalities that might be causing the impaired cardiac output characteristic of cardiogenic shock. By assessing the electrical activity of the heart, healthcare providers can quickly determine if the patient's shock is due to cardiac issues such as ischemia or arrhythmias.

Other tests such as a CBC with differential, serum lactate level, and arterial blood gas (ABG) can provide valuable information about the patient's overall condition, oxygenation, and potential underlying causes. However, they do not specifically focus on the cardiac function as directly as an EKG does. Therefore, while these tests may contribute to the comprehensive assessment of a patient in shock, the EKG is the most appropriate initial diagnostic tool for evaluating cardiogenic shock specifically.