<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been feeling very weak and tired lately. What could be the reason for this?  <response>: It could be due to anemia. To confirm this, we will need to run some tests including a hematologic test, a complete blood count, a glucose measurement, an electrolytes panel, a urinalysis, kidney function tests, and an electrocardiogram. 