Laboratory Medicine and Quality Assurance

Table. 8.

Distribution of analytical methods (principle) participated and coefficients of variation (%) according to principle of urine chemistry in 2023

Test Method Trials
1st 2nd
Lab* CUC-23-01 CUC-23-02 CUC-23-03 Lab CUC-23-04 CUC-23-05 CUC-23-06
Albumin 217 34.3 18.3 33.2 220 15.2 32.3 14.3
Immunoturbidimetry 213 33.3 17.8 32.2 215 15.0 31.3 14.0
Calcium 181 4.4 2.6 4.4 180 2.7 3.7 2.4
Colorimetry Arsenazo III 33 2.6 3.5 3.1 36 3.7 3.0 4.2
Colorimetry Methylxylenol blue 27 2.0 1.9 2.8 27 1.0 2.2 1.2
Colorimetry OCPC 47 4.2 3.2 4.5 41 1.8 5.1 2.2
NM-BAPTA 73 1.9 1.6 2.6 75 1.3 2.5 1.1
Chloride 216 6.6 2.2 7.3 217 2.5 7.0 2.6
ISE, diluted 211 6.5 2.2 7.3 215 2.5 7.0 2.6
ISE, undiluted 3 3.5 0.6 6.5 - - - -
Creatinine 256 4.1 3.9 4.2 259 3.7 3.9 3.6
Enzymatic method 17 2.8 4.5 3.2 16 2.7 2.0 3.2
kinetic Jaffe with compensation 6 1.5 3.6 1.4 5 3.9 4.0 3.5
kinetic Jaffe without compensation 209 3.6 3.0 3.5 213 2.9 3.1 3.0
Rate blanked compensated kinetic Jaffe method 23 2.0 2.1 2.6 24 2.2 1.9 2.4
Glucose 154 0.0 1.9 2.9 152 1.9 0.3 2.0
Hexokinase 154 0.0 1.9 2.9 152 1.9 0.3 2.0
Magnesium 119 3.3 2.9 3.2 122 3.1 3.4 3.2
Colorimetry xylidyl blue 115 3.3 3.0 3.2 118 3.1 3.0 3.2
Phosphorus 156 2.6 2.9 2.8 155 2.2 2.7 2.0
Molybden blue colorimetry 27 2.7 1.9 2.6 26 2.8 2.1 1.4
Phosphomolybdate 129 2.5 2.4 2.8 129 2.0 2.6 2.2
Potassium 217 1.5 3.0 1.3 218 2.2 1.2 2.1
ISE, diluted 212 1.5 2.9 1.3 216 2.2 1.2 2.1
ISE, undiluted 3 3.5 0.6 1.5 - - - -
Protein 217 6.0 8.3 6.8 219 8.4 5.3 8.7
Biuret method 4 7.7 5.1 8.3 4 4.2 4.8 6.0
dye binding using pyrogallol red 117 5.8 6.4 7.2 118 7.2 6.6 6.6
turbidimetry using benzethonium chloride 96 4.0 2.4 3.4 97 2.1 3.0 1.9
Sodium 219 2.5 1.1 2.3 220 1.1 2.4 1.0
ISE, diluted 214 2.3 1.1 2.3 218 1.1 2.4 0.9
ISE, undiluted 3 1.0 1.9 2.2 - - - -
Urea nitrogen 177 3.8 4.1 3.9 176 3.0 3.6 3.0
Urease with GLDH 177 3.8 4.1 3.9 176 3.0 3.6 3.0
Uric acid 164 3.4 2.3 2.8 165 2.8 4.2 2.9
Uricase 164 3.4 2.3 2.8 165 2.8 4.2 2.9

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 2023.

Lab Med Qual Assur 2024;46:130~144 https://doi.org/10.15263/jlmqa.2024.46.3.130
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