Adsorption of Urinary Proteins on the Conventionally Used Urine Collection Tubes: Possible Effects on Urinary Proteome Analysis and Prevention of the Adsorption by Polymer Coating

Table 3

Quantitative values for urinalysis parameters in samples kept in poly(MPC-co-BMA)-coated and noncoated urine collection tubes.

Parameters	Noncoated tube	Coated tube
pH	6.17 ± 0.58	6.17 ± 0.58
Protein (mg/dL)	57.8 ± 136.5	58.5 ± 138.2
Glucose (mg/dL)	182.4 ± 556.3	184.2 ± 561.0
Creatinine (mg/mL)	1.2 ± 0.7	1.2 ± 0.7
Microalbumin (mg/L)	212.0 ± 323.4	212.4 ± 324.2
Beta-2-microglobulin (μg/L)	1771.3 ± 3269.7	1772.4 ± 3275.0
Amylase (IU/L)	298.2 ± 245.2	300.3 ± 246.5
N-acetyl-β-D-glucosaminidase (U/L)	17.4 ± 19.2	17.4 ± 19.2
Urea nitrogen (mg/dL)	620.2 ± 315.9	623.3 ± 317.8
Uric acid (mg/dL)	49.8 ± 27.5	50.0 ± 27.7
Calcium (mg/dL)	10.7 ± 9.7	10.8 ± 9.7
Magnesium (mg/dL)	6.8 ± 3.8	6.8 ± 3.8
Sodium (mEq/L)	106.9 ± 48.9	107.1 ± 49.1
Potassium (mEq/L)	45.4 ± 26.3	45.5 ± 26.4
Chlorine (mEq/L)	169.5 ± 85.4	169.7 ± 85.2
Inorganic phosphorus (mg/dL)	53.1 ± 30.3	53.4 ± 30.6