Table 3. The cell-free fraction of urine (corresponding to the supernatant) contains cell-free nucleic acids as assessed by qRTPCR for human actin.

	Whole urine	7,500 RPM pellet	7,500 RPM supernatant	15,000 RPM pellet	15,000 RPM supernatant
Average Ct (± SD)	28.8 (±.4)	30.6 (±.3)	30.3 (±.1)	31.0 (±.3)	30.9 (±.3)

Ct, cycle threshold; SD, standard deviation