Table 2.

Exposure of human urine samples to repeated thawing, with either phosphoric acid added following collection or no phosphoric acid added. Data shown is average (and range) percent change of the iuOTM levels as compared to the original measurement directly following collection.

Storage method	Thawing cycles
	1×	2×	3×
PA added	−4.8% (−15.0% to +5.4%)	−0.7% (−8.3% to +6.9%)	35.7% (+14.4% to +56.9%)
No PA added	4.1% (+1.5% to +7.8%)	6.4% (−1.5% to +14.4%)	−6.9% (−14.2% to +0.4%)

PA, phosphoric acid.