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Table. 1.

Table. 1.

TEa for quantitative readout values of each grade from URSTs derived from the range of change %R

Analyte Grade Concentration* or count Instrument range of change %R Mid-point TEaL TEaH
RBC 0 RBC/μL −99 –17
± 5 RBC/μL 18–27 22.5 19.00
+ 10 RBC/μL 28–55 41.5 19.00 31.50
2+ 50 RBC/μL 56–90 73.0 31.50
3+ 250 RBC/μL 91−
Bilirubin 0 mg/dL −99–33
+ 0.5 mg/dL 34–46 40.0 14.50
2+ 1 mg/dL 47–62 54.5 14.50
3+ 3 mg/dL 63−
Urobilinogen ± 0.1 mg/dL −99–34
+ 1 mg/dL 35–46 40.5 12.00
2+ 4 mg/dL 47–58 52.5 12.00 14.50
3+ 8 mg/dL 59–75 67.0 14.50
4+ 12 mg/dL 76−
Ketone 0 mg/dL −99–20
± 5 mg/dL 21–30 25.5 13.00
+ 10 mg/dL 31–46 38.5 13.00 15.00
2+ 50 mg/dL 47–60 53.5 15.00
3+ 100 mg/dL 61−
Protein 0 mg/dL −99 – 25
± 10 mg/dL 26–34 30.0 18.50
+ 30 mg/dL 35–62 48.5 18.50 27.50
2+ 100 mg/dL 63–89 76.0 27.50 21.00
3+ 300 mg/dL 90–104 97.0 21.00
4+ 1,000 mg/dL
Glucose 0 mg/dL −99–30
± 100 mg/dL 31–100 65.5 77.50
+ 250 mg/dL 101–185 143.0 77.50 65.00
2+ 500 mg/dL 186–230 208.0 65.00
3+ 1,000 mg/dL 231−
Leukocytes 0 WBC/μL −99–10
± 10 WBC/μL 11–22 16.5 16.00
+ 25 WBC/μL 23–42 32.5 16.00 16.50
2+ 75 WBC/μL 43–55 49.0 16.50
3+ 500 WBC/μL 56−
pH 5 −99–26
5.5 26–40 33.0 15.00
6 41–55 48.0 15.00 20.00
6.5 56–80 68.0 20.00 27.50
7 81–110 95.5 27.50 42.50
7.5 111–165 138.0 42.50 42.50
8 166–195 180.5 42.50 22.50
8.5 196–210 203.0 22.50 402.00
9 211–999 605.0 402.00 402.00

*Conversion factors from conventional units to Système International (SI) units are: bilirubin, from mg/dL to μmol/L multiply by 17.1; urobilinogen, from mg/dL to μmol/L multiply by 16.93; ketone, from mg/dL to mmol/L multiply by 0.1721; protein, from mg/dL to mg/L multiply by 10; glucose, from mg/dL to mmol/L multiply by 0.0555.

Abbreviations: TEa, total allowable error; URSTs, urine reagent strip tests; TEaL, difference of the midpoints of adjacent lower grades; TEaH, difference of the midpoints of adjacent higher grades; RBC, red blood cells; WBC, white blood cells.

Ann Lab Med 2021;41:447~454

© Ann Lab Med