Laboratory Medicine and Quality Assurance

Table. 8.

Distribution of analytical methods (principle) used and coefficients of variation (%) according to principle of urine chemistry in 2019

Test/method Trials
1st 2nd
Lab* CUC-19-01 CUC-19-02 CUC-19-03 Lab CUC-19-04 CUC-19-05 CUC-19-06
Albumin 183 19.1 29.3 19.2 184 15.8 27.0 14.6
Immunoturbidimetry 173 17.9 28.7 18.1 174 15.4 27.1 14.1
Other method 8 46.6 69.2 47.6 6 10.2 29.9 11.0
Calcium 161 2.6 3.8 2.7 158 2.2 4.0 2.4
Colorimetry_arsenazo III 24 4.0 3.4 3.8 25 2.7 2.5 2.8
Colorimetry_methylxylenol blue 8 2.0 2.7 1.3 11 1.8 3.3 1.5
Colorimetry_OCPC 74 2.6 3.5 2.7 66 3.1 4.8 3.0
NM-BAPTA 52 1.7 2.9 1.6 53 1.2 2.0 1.5
Other method 3 3.7 1.2 2.9 3 2.7 3.7 4.2
Chloride 188 2.0 7.3 2.1 182 2.1 7.0 2.2
ISE, diluted 182 2.0 7.1 2.1 178 2.0 7.0 2.2
ISE, undiluted 4 22.8 19.3 12.5 2 61.6 33.4 70.9
Creatinine 220 4.3 5.2 5.0 218 4.8 4.7 4.7
Enzymatic method 9 5.3 4.9 5.0 9 5.2 4.4 5.0
Kinetic Jaffe without compensation 187 4.2 4.9 4.4 185 4.5 4.4 4.3
Rate blanked compensated kinetic Jaffe method 22 2.4 3.5 3.7 20 3.3 3.5 3.8
Glucose 140 2.0 3.6 2.2 138 2.4 3.6 2.3
Hexokinase 140 2.0 3.6 2.2 138 2.4 3.6 2.3
Magnesium 111 4.0 3.9 4.1 111 3.3 3.0 3.1
Colorimetry_Xylidyl blue 110 4.0 3.9 4.1 110 3.3 2.9 3.2
Phosphorus 143 2.6 2.8 2.9 141 2.2 2.2 1.8
Molybden blue colorimetry 16 3.8 2.1 3.9 16 2.4 1.6 2.0
Phosphomolybdate 127 2.6 3.0 2.7 125 2.1 2.3 1.8
Potassium 189 3.3 1.9 2.9 183 2.7 1.9 2.7
ISE, diluted 183 3.4 1.8 2.9 179 2.7 1.9 2.7
ISE, undiluted 4 16.7 7.1 24.1 2 38.6 37.6 56.4
Protein 190 8.7 8.6 8.0 189 8.1 7.4 8.6
Biuret method 5 2.1 8.8 2.2 5 2.1 5.0 2.2
Dye binding using pyrogallol red 112 8.6 9.9 8.1 111 7.8 10.2 8.5
Turbidimetry using benzethonium chloride 72 3.9 6.6 3.6 72 3.1 5.0 2.7
Sodium 191 1.2 2.7 1.2 186 1.3 2.5 1.1
ISE, diluted 183 1.2 2.7 1.2 180 1.3 2.5 1.1
ISE, undiluted 5 3.0 4.6 2.9 3 51.9 34.3 61.6
Urea nitrogen 163 3.6 3.9 3.5 161 3.2 3.6 3.4
Urease with GLDH 163 3.6 3.9 3.5 161 3.2 3.6 3.4
Uric acid 155 3.5 4.7 3.6 151 3.7 5.7 3.8
Uricase 154 3.6 4.7 3.6 150 3.7 5.7 3.8

Abbreviations: OCPC, o-creolphthalein complexone; NM-BAPTA, 5-nitro-5'-methyl-BAPTA; ISE, ion-selective electrodes; GLDH, glutamate dehydrogenase.

*Number of laboratories participated in Korean External Quality Assessment Service 2019.

Lab Med Qual Assur 2020;42:97~111 https://doi.org/10.15263/jlmqa.2020.42.3.97
© Lab Med Qual Assur