Results of proficiency tests for quantitative anti-Tg in 2018 and 2019
| Trial | Manufacturer | No. of participants (%) | No. of outliers | Mean±SD | CV (%) | Median | Min | Max |
|---|---|---|---|---|---|---|---|---|
| 2018, 1st | Total | 68 (100.0) | 0 | 252.42±117.14 | 46.4 | 321.8 | 52.3 | 470.3 |
| Abbott Diagnostics | 10 (14.7) | 56.67±3.67 | 6.5 | 57.0 | 52.3 | 64.2 | ||
| Beckman Coulter | 2 (2.9) | 144.05±6.58 | 4.6 | 139.4 | 148.7 | |||
| Diesse Diagnostica Senese SpA | 2 (2.9) | 134.15±13.51 | 10.1 | 124.6 | 143.7 | |||
| Grifols | 1 (1.5) | 166.00 | 166.0 | |||||
| Siemens Healthineers | 10 (14.7) | 150.89±10.30 | 6.8 | 149.8 | 78.4 | 216.0 | ||
| Roche Diagnostics | 42 (61.8) | 336.04±17.25 | 5.1 | 334.1 | 307.6 | 470.3 | ||
| Others | 1 (1.5) | 126.00 | 126 | |||||
| 2018, 2nd | Total | 70 (100.0) | 0 | 157.00±71.50 | 45.5 | 191.8 | 24.2 | 281.9 |
| Abbott Diagnostics | 11 (15.7) | 25.92±0.85 | 3.3 | 26.1 | 24.2 | 31.5 | ||
| Beckman Coulter | 3 (4.3) | 93.37±7.93 | 8.5 | 89.3 | 88.3 | 102.5 | ||
| Diesse Diagnostica Senese SpA | 2 (2.9) | 86.30±61.09 | 70.8 | 43.1 | 129.5 | |||
| Dynex Technologies | 1 (1.4) | 117.30 | 117.3 | |||||
| Grifols | 1 (1.4) | 259.00 | 259.0 | |||||
| Roche Diagnostics | 43 (61.4) | 202.31±12.60 | 6.2 | 202.8 | 178.5 | 281.9 | ||
| Siemens Healthineers | 9 (12.9) | 117.47±9.61 | 8.2 | 117.3 | 105.1 | 131.8 | ||
| 2019, 1st | Total | 81 (100.0) | 18 | 111.39±11.59 | 10.4 | 109.6 | 19.4 | 138.8 |
| Abbott Diagnostics | 11 (13.6) | 27.46±1.17 | 4.3 | 27.5 | 25.3 | 31.7 | ||
| Beckman Coulter | 4 (4.9) | 21.10±1.38 | 6.6 | 21.3 | 19.4 | 22.5 | ||
| DiaSorin | 1 (1.2) | 63.40 | 63.4 | |||||
| Diesse Diagnostica Senese SpA | 1 (1.2) | 34.70 | 34.7 | |||||
| Dynex Technologies | 1 (1.2) | 73.80 | 73.8 | |||||
| Grifols | 1 (1.2) | 108.00 | 108.0 | |||||
| Roche Diagnostics | 54 (66.7) | 113.90±5.83 | 5.1 | 113.9 | 26.4 | 138.8 | ||
| Siemens Healthineers | 8 (9.9) | 101.94±9.07 | 8.9 | 103.7 | 20.4 | 111.9 | ||
| 2019, 2nd | Total | 81 (100.0) | 3 | 9.91±6.95 | 70.1 | 10.0 | 0.0 | 61.0 |
| Abbott Diagnostics | 12 (14.8) | 20.96±1.52 | 7.3 | 21.2 | 17.6 | 28.6 | ||
| Beckman Coulter | 5 (6.2) | 4.20±0.34 | 8.1 | 4.0 | 3.9 | 4.7 | ||
| DiaSorin | 1 (1.2) | 46.00 | 46.0 | |||||
| Dynex Technologies | 1 (1.2) | 61.00 | 61.0 | |||||
| Grifols | 1 (1.2) | 31.30 | 31.3 | |||||
| Roche Diagnostics | 53 (65.4) | 7.21±4.59 | 63.6 | 10.0 | 0 | 12.5 | ||
| Siemens Healthineers | 8 (9.9) | 15.00±0.00 | 0 | 15.0 | 0 | 20.0 |
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); Siemens Healthineers (Erlangen, Germany); Roche Diagnostics (Mannheim, Germany); Dynex Technologies (Chantilly, VA, USA); and DiaSorin (DiaSorin, Saluggia, Italy).
Abbreviations: anti-Tg, anti-thyroglobulin antibody; SD, standard deviation; CV, coefficient of variation.