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.
Doctors usually do blood tests: (1) liver enzymes which show if there may be damage to the liver cells. (2) liver function tests to show if the cells of the liver are functioning well to keep the body healthy (3) viral testing to see if there is a liver problem caused by a virus like Hepatitis A,B,C,ETC.