=====Sample preparation/sorting=====
  
 - After centrifugation samples are sorting on basis of total volume and serum/plasma volume for Erba XL 1000 and Erba XL640
            * For Plain vacuette
                * if Total blood volume <2.0, analyses in Erba Xl 640.
                * if Total blood volume >2.0 and serum <0.7, analyses in Erba Xl 640.
                * if Total blood volume >2.0 and serum >0.7, analyses in Erba Xl 1000.
            * For Flouride vacuette
                * if Total blood volume <1.5, analyses in Erba Xl 640.
                * if Total blood volume >1.5 and plasma <0.5, analyses in Erba Xl 640.
                * if Total blood volume >1.5 and plasma >0.5, analyses in Erba Xl 1000.