Results of proficiency tests for quantitative anti-TPO in 2018 and 2019
| Trial | Manufacturer | No. of participants (%) | No. of outliers | Mean±SD | CV (%) | Median | Min | Max |
|---|---|---|---|---|---|---|---|---|
| 2018, 1st | Total | 61 (100.0) | 9 | 146.78±24.31 | 16.6 | 144.5 | 77.2 | 370.3 |
| Abbott Diagnostics | 10 (16.4) | 181.97±11.78 | 6.5 | 180.4 | 168.7 | 199.0 | ||
| Beckman Coulter | 4 (6.6) | 120.75±1.62 | 1.3 | 121.1 | 118.7 | 122.1 | ||
| Diesse Diagnostica Senese SpA | 2 (3.3) | 241.15±73.75 | 30.6 | 189.0 | 293.3 | |||
| Grifols | 1 (1.6) | 146.00 | 146.0 | |||||
| Roche Diagnostics | 34 (55.7) | 138.99±8.30 | 6.0 | 139.9 | 124.0 | 199.2 | ||
| Siemens Healthineers | 9 (14.8) | 355.33±13.76 | 3.9 | 358.9 | 77.2 | 370.3 | ||
| Others | 1 (1.6) | 132.00 | 132.0 | |||||
| 2018, 2nd | Total | 64 (100.0) | 9 | 75.95±14.10 | 18.6 | 80.4 | 41.0 | 394.0 |
| Abbott Diagnostics | 11 (17.2) | 66.47±3.59 | 5.4 | 67.0 | 60.3 | 72.6 | ||
| Beckman Coulter | 4 (6.3) | 44.10±2.72 | 6.2 | 44.0 | 41.0 | 47.4 | ||
| Diesse Diagnostica Senese SpA | 2 (3.1) | 77.95±38.25 | 49.1 | 50.9 | 105.0 | |||
| Dynex Technologies | 1 (1.6) | 92.00 | 92.0 | |||||
| Grifols | 1 (1.6) | 89.60 | 89.6 | |||||
| Roche Diagnostics | 37 (57.8) | 81.45±8.50 | 10.4 | 82.3 | 61.5 | 394.0 | ||
| Siemens Healthineers | 8 (12.5) | 207.89±16.42 | 7.9 | 203.7 | 187.4 | 232.1 | ||
| 2019, 1st | Total | 80 (100.0) | 11 | 18.16±3.81 | 21 | 19.7 | 9.7 | 114.2 |
| Abbott Diagnostics | 13 (16.3) | 18.10±1.33 | 7.4 | 17.6 | 15.6 | 19.7 | ||
| Beckman Coulter | 5 (6.3) | 12.33±0.12 | 0.9 | 12.4 | 11.7 | 13.3 | ||
| bioMérieux | 1 (1.3) | 9.70 | 9.7 | |||||
| DiaSorin | 1 (1.3) | 28.60 | 28.6 | |||||
| Diesse Diagnostica Senese SpA | 1(1.3) | 17.60 | 17.6 | |||||
| Dynex Technologies | 1 (1.3) | 42.60 | 42.6 | |||||
| Grifols | 1 (1.3) | 31.20 | 31.2 | |||||
| Roche Diagnostics | 48 (60.0) | 18.78±3.61 | 19.2 | 19.9 | 11.8 | 114.2 | ||
| Siemens Healthineers | 9 (11.3) | 77.66±5.54 | 7.1 | 76.8 | 17.1 | 91.7 | ||
| 2019, 2nd | Total | 81 (100.0) | 9 | 120.58±22.33 | 18.5 | 115.0 | 2.5 | 897.3 |
| Abbott Diagnostics | 14 (17.3) | 157.41±8.31 | 5.3 | 159.6 | 144.2 | 170.6 | ||
| Beckman Coulter | 6 (7.4) | 106.06±4.07 | 3.8 | 105.2 | 2.5 | 110.1 | ||
| bioMérieux | 1 (1.2) | 97.60 | 97.6 | |||||
| DiaSorin | 1 (1.2) | 167.00 | 167.0 | |||||
| Dynex Technologies | 1 (1.2) | 132.00 | 132.0 | |||||
| Grifols | 1 (1.2) | 154.00 | 154.0 | |||||
| Roche Diagnostics | 48 (59.3) | 109.44±9.19 | 8.4 | 111.9 | 91.5 | 131.3 | ||
| Siemens Healthineers | 9 (11.1) | 780.85±78.07 | 10.0 | 737.9 | 144.0 | 897.3 |
Manufacturers of instrument are listed in alphabetical order. The instruments were from the following companies: Abbott Diagnostics (Abbott Park, IL, USA); Beckman Coulter (Brea, CA, USA); Diesse Diagnostica Senese SpA (Monteriggioni, Italy); Grifols (Barcelona, Spain); Roche Diagnostics (Mannheim, Germany); Siemens Healthineers (Erlangen, Germany); Dynex Technologies (Chantilly, VA, USA); bioMérieux (bioMérieux, Marcy-l'Etoile, France); and DiaSorin (DiaSorin, Saluggia, Italy).
Abbreviations: anti-TPO, anti-thyroperoxidase antibody; SD, standard deviation; CV, coefficient of variation.