Laboratory Medicine and Quality Assurance

Table. 8.

Distribution of analytical methods (principle) and coefficients of variation (%) according to the principle of the urine chemistry program in 2021

Test Method Trials

1st 2nd


Lab* CUC-21-01 CUC-21-02 CUC-21-03 Lab CUC-21-04 CUC-21-05 CUC-21-06
Albumin Total 202 40.6 13.7 40.5 201 13.0 37.0 14.4
Immunoturbidimetry 196 38.9 13.4 39.1 194 12.0 35.2 13.5
Calcium Total 176 4.5 2.8 3.3 174 2.3 3.9 2.8
Colorimetry_Arsenazo III 29 3.1 2.1 2.2 31 2.3 1.8 1.6
Colorimetry_Methylxylenol blue 21 5.9 2.6 4.8 23 1.9 4.0 2.2
Colorimetry_OCPC 59 4.2 2.8 3.1 55 2.5 4.7 2.9
NM-BAPTA 65 3.3 1.7 1.9 64 1.4 2.5 1.7
Chloride Total 209 7.0 2.2 6.0 209 1.9 8.3 2.1
ISE, diluted 204 7.0 2.2 6.0 202 1.9 8.3 2.1
ISE, undiluted 4 17.7 2.5 14.1 6 1.1 7.6 2.1
Creatinine Total 246 4.1 3.9 3.8 246 3.1 3.7 2.9
Enzymatic method 16 3.1 5.6 3.3 15 5.2 2.9 5.0
Kinetic Jaffe with compensation 9 3.7 2.8 3.6 8 2.8 3.3 2.5
Kinetic Jaffe without compensation 197 3.5 3.4 3.1 197 2.7 3.4 2.5
Rate blanked compensated kinetic Jaffe method 23 2.4 2.5 3.3 25 2.4 2.6 2.6
Glucose Total 150 3.3 2.2 0.0 150 2.1 3.1 2.3
Hexokinase 150 3.3 2.2 0.0 150 2.1 3.1 2.3
Magnesium Total 116 2.8 2.5 2.7 116 3.2 2.9 3.0
Colorimetry_Xylidyl blue 115 2.8 2.5 2.7 114 3.2 2.9 3.0
Phosphorus Total 151 2.0 2.2 2.3 150 2.5 2.2 2.1
Molybden blue colorimetry 22 2.0 1.0 2.0 21 1.1 1.9 1.3
Phosphomolybdate 129 2.0 2.0 2.2 129 2.5 2.2 2.3
Potassium Total 211 1.6 2.9 1.6 211 4.2 1.9 4.5
ISE, diluted 206 1.6 2.9 1.6 204 4.2 1.9 4.5
ISE, undiluted 4 3.2 6.3 1.7 6 7.2 3.1 5.2
Protein Total 209 6.3 7.1 6.6 209 7.8 5.7 7.4
Biuret method 12 3.8 1.9 4.4 11 1.0 2.3 1.4
Dye binding using pyrogallol red 114 7.1 6.2 8.4 113 7.5 6.1 6.3
Turbidimetry using benzethonium chloride 83 3.6 2.5 4.0 84 2.5 4.7 2.8
Sodium Total 213 3.3 1.2 2.7 213 1.2 2.7 0.9
ISE, diluted 208 3.3 1.2 2.7 206 1.2 2.7 0.9
ISE, undiluted 4 1.1 7.2 7.8 6 3.9 4.6 2.4
Urea nitrogen Total 174 3.7 3.4 3.5 174 2.9 3.2 2.7
Urease with GLDH 174 3.7 3.4 3.5 174 2.9 3.2 2.7
Uric acid Total 161 4.6 3.3 5.4 161 2.5 4.2 2.5
Uricase 161 4.6 3.3 5.4 161 2.5 4.2 2.5

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 2021.

Lab Med Qual Assur 2022;44:121~135 https://doi.org/10.15263/jlmqa.2022.44.3.121
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