Two drops (100 µl) of 10X PBS (provided) should be added to
each 1 ml of fresh urine. The sample should then be cetrifuged
at high speed (10,000 x rpm) for ten minutes. The supernatant
is discarded and the solid material (pellet) found at the bottom
of the test tube should be resuspended in one drop (50 µl) of
1X PBS (provided) prior to DNA extraction. These concentrated
.urine samples can be stored frozen