Final answer:
A Chest X-ray is the primary diagnostic tool for an uncomplicated retrosternal hemorrhage, being most relevant for visualization of the hemorrhage. While ECG, blood pressure measurement, and urinalysis can offer additional information, they do not directly identify bleeding in the retrosternal area.
Step-by-step explanation:
The best diagnostic tool for assessing an uncomplicated retrosternal hemorrhage is a Chest X-ray. This imaging technique allows for the visualization of the structures within the chest cavity and can indicate the presence, location, and extent of a hemorrhage. While other tests such as an Electrocardiogram (ECG), blood pressure measurement, and urinalysis can provide relevant information, they are not specifically focused on identifying bleeding in the retrosternal area. The ECG, for example, measures the electrical activity of the heart and can indicate issues like myocardial infarction (MI), but it does not visualize bleeding. Blood pressure measurement and urinalysis could point to secondary effects or unrelated issues, but the direct observation provided by a Chest X-ray is most relevant for this diagnosis.
Heart sounds, detected by auscultation using a stethoscope, can provide important clues about the state of a patient's heart but would not be the primary diagnostic tool for a retrosternal hemorrhage. In some instances, advanced imaging like echocardiography or cardiac MRI may be useful in evaluating the impact on cardiac structures or function.