Distribution of analytical methods (principle) and coefficients of variation (%) for the principles of urine chemistry in 2018
| Test/method | Trials | |||||||
|---|---|---|---|---|---|---|---|---|
| 1st | 2nd | |||||||
| Lab | CUC-18-01 | CUC-18-02 | CUC-18-03 | Lab | CUC-18-04 | CUC-18-05 | CUC-18-06 | |
| Albumin | 166 | 30.0 | 19.0 | 19.4 | 172 | 14.2 | 20.3 | 32.5 |
| Dye binding-BCG | 2 | 15.7 | 12.7 | 13.2 | 2 | 33.9 | 26.3 | 44.7 |
| Immunoturbidimetry | 155 | 29.7 | 17.7 | 18.0 | 160 | 13.9 | 18.6 | 30.0 |
| Calcium | 151 | 4.0 | 2.7 | 2.3 | 155 | 4.3 | 2.6 | 3.4 |
| Arsenazo III dye | 19 | 4.1 | 3.0 | 2.7 | 22 | 2.3 | 4.0 | 3.4 |
| Cresolphthalein complexone | 79 | 3.8 | 3.0 | 2.7 | 77 | 3.9 | 2.4 | 3.3 |
| MXB method (methylxylenol blue) | 4 | 2.0 | 1.1 | 1.8 | 5 | 7.3 | 0.9 | 5.4 |
| NM-BAPTA | 47 | 2.1 | 1.7 | 1.8 | 49 | 2.8 | 1.9 | 2.8 |
| Chloride | 177 | 8.8 | 2.5 | 2.5 | 183 | 9.0 | 2.4 | 8.7 |
| ISE, diluted (indirect) | 170 | 8.5 | 2.5 | 2.5 | 176 | 8.6 | 2.4 | 8.5 |
| ISE, undiluted (direct) | 4 | 8.5 | 11.6 | 12.1 | 4 | 15.4 | 15.7 | 15.2 |
| Creatinine | 206 | 5.5 | 4.9 | 4.8 | 209 | 5.2 | 4.9 | 5.1 |
| Compensated kinetic Jaffe method | 50 | 2.0 | 2.7 | 2.5 | 50 | 1.8 | 2.3 | 2.3 |
| Enzymatic method | 10 | 2.4 | 3.1 | 3.5 | 10 | 2.3 | 3.1 | 3.3 |
| kinetic Jaffe method | 56 | 5.1 | 5.2 | 4.5 | 57 | 4.2 | 4.6 | 4.1 |
| Rate blanked compensated kinetic Jaffe method | 89 | 3.7 | 3.7 | 3.4 | 91 | 3.8 | 3.5 | 3.6 |
| Glucose | 135 | 2.2 | 2.2 | 2.2 | 137 | 3.3 | 2.6 | 1.3 |
| Hexokinase | 134 | 2.2 | 2.2 | 2.2 | 136 | 3.3 | 2.7 | 2.6 |
| Magnesium | 109 | 3.0 | 2.8 | 3.5 | 108 | 3.3 | 3.6 | 3.6 |
| Chlorophosphonazo III | 2 | 13.0 | 1.2 | 0.8 | ||||
| Colorimetrc test-Xylidyl blue | 11 | 3.5 | 1.1 | 1.7 | 11 | 4.3 | 3.7 | 5.8 |
| Colorimetric (Dye-Xylidyl blue/magon) | 95 | 3.0 | 2.9 | 3.6 | 96 | 3.1 | 3.6 | 3.5 |
| Phosphorus | 138 | 2.5 | 2.6 | 2.9 | 139 | 2.6 | 2.8 | 2.8 |
| Phosphomolybdate with any reduction method | 3 | 2.2 | 0.9 | 1.8 | 4 | 0.4 | 2.5 | 1.2 |
| Phosphomolybdate, UV | 135 | 2.5 | 2.6 | 2.8 | 135 | 2.6 | 2.8 | 2.9 |
| Potassium | 178 | 2.1 | 3.1 | 3.4 | 184 | 1.8 | 3.6 | 1.9 |
| ISE, diluted (indirect) | 171 | 2.1 | 3.1 | 3.5 | 177 | 1.8 | 3.7 | 1.9 |
| ISE, undiluted (direct) | 4 | 4.2 | 11.9 | 12.5 | 4 | 5.5 | 21.0 | 4.7 |
| Protein | 173 | 11.0 | 9.0 | 8.6 | 177 | 9.9 | 9.0 | 10.5 |
| Biuret method | 5 | 14.3 | 12.1 | 9.3 | 4 | 5.6 | 7.3 | 9.2 |
| dye binding using pyrogallol red | 97 | 13.3 | 10.3 | 9.2 | 102 | 12.5 | 10.0 | 15.0 |
| turbidimetry using benzethonium chloride | 69 | 5.3 | 3.6 | 3.8 | 70 | 5.3 | 3.5 | 5.1 |
| Sodium | 180 | 2.8 | 1.2 | 1.1 | 186 | 2.2 | 1.1 | 2.3 |
| ISE, diluted (indirect) | 172 | 2.8 | 1.2 | 1.0 | 178 | 2.2 | 1.1 | 2.3 |
| ISE, undiluted (direct) | 5 | 3.7 | 3.3 | 4.1 | 5 | 4.3 | 2.6 | 0.0 |
| Urea nitrogen | 152 | 2.9 | 2.8 | 2.3 | 156 | 3.3 | 3.1 | 3.2 |
| Enzymatic UV test (urease-GLDH) | 9 | 5.5 | 1.8 | 3.7 | 9 | 5.4 | 5.7 | 2.8 |
| Urease with GLDH (coupled enzymes) | 143 | 2.8 | 2.5 | 2.3 | 147 | 3.0 | 3.2 | 3.1 |
| Uric acid | 145 | 4.3 | 3.5 | 3.6 | 146 | 4.6 | 3.7 | 4.5 |
| Uricase | 143 | 4.4 | 3.5 | 3.6 | 144 | 4.6 | 3.7 | 4.5 |
Abbreviations: BCG, bromocresol green; NM-BAPTA, 5-nitro-5’-methyl-BAPTA; ISE, ion-selective electrodes; UV, ultra violet; GLDH, glutamate dehydrogenase.
Number of Laboratories participated in Korean External Quality Assessment Service 2018.