1 History presents an historian with the task of producing a dialogue between the past and the present. 2  But as these temporal co-ordinates cannot be fixed, history becomes a continuous interaction between the historian and the past.
A routine blood test usually only test for some general features, like potassium, sodium, creatinine, urea, C-reactive protein and a few other. It does often make a blood count of both red blood cells and white blood cells too. In that way it can detect leukemia.
Routine lab blood tests are important in the evaluation of people with heart failure. These tests can help identify causes of heart failure; whether other organs, such as the kidneys and liver, have been affected by the heart failure; or whether medicines, such as diuretics, have affected the normal electrolyte levels, such as sodium or potassium levels.