Table 2. Comparison of analytical results of nine laboratories and the correct composition of samples for stone analysis.
| Lab A | Lab B | Lab C | Lab D | Lab E | Lab F | Lab G | Lab H | Lab I | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| XD | IR | IR | IR | IR | IR | IR | IR | CD | |||
| Sample | Substances | % | % | % | % | % | % | % | % | % | % |
| Survey 1 | |||||||||||
| A | Cholesterol | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 0 | 0 | 0 |
| False analysis | - | - | - | - | - | - | - | 100 MP | 100 AF | 100 NI | |
| B | Uric acid dihydrate | 60 | 50 | 50 | 0 | 60 | 30 | 0 | 0 | 0 | 0 |
| Uricite | 40 | 50 | 50 | 80 | 40 | 60 | 0 | 0 | 100 | 100 | |
| False analysis | - | - | - | 20 WD | - | 10 WH | 100 UA | 100 UA | - | - | |
| C | Brushite | 50 | 60 | 70 | 50 | 60 | 30 | 50 | 100 | 50 | 0 |
| Whewellite | 50 | 40 | 30 | 50 | 40 | 50 | 0 | 0 | 0 | 40 | |
| False analysis | - | - | - | - | - | 20 WD | 50 CaOx | - | 50 WD | 30 WD | |
| False analysis | - | - | - | - | - | - | - | - | - | 30 AP | |
| D | Monopotassium urate | 100 | 100 | 100 | 100 | 100 | 100 | 0 | 0 | 0 | 0 |
| False analysis | - | - | - | - | - | - | 100 UA | 100 MU | 100 MU | 100 NI | |
| Survey 2 | |||||||||||
| A | Calcite | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 0 | 0 |
| False analysis | - | - | - | - | - | - | - | - | 100 NI | 100 NI | |
| B | Uricite | 50 | 30 | 60 | 50 | 70 | 35 | 0 | 100 | 50 | 0 |
| Whewellite | 50 | 70 | 30 | 50 | 30 | 65 | 0 | 0 | 50 | 0 | |
| False analysis | - | - | 10 UD | - | - | - | 65 CaOx | - | - | 100 NI | |
| False analysis | - | - | - | - | - | - | 35 UA | - | - | - | |
| C | Cystine | 60 | 80 | 60 | 60 | 60 | 55 | 70 | 100 | 90 | 100 |
| Whewellite | 40 | 20 | 40 | 40 | 40 | 45 | 0 | 0 | 10 | 0 | |
| False analysis | - | - | - | - | - | - | 30 CaOx | - | - | - | |
| D | Whitlockite | 100 | 90 | 100 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| False analysis | - | 10 NI | - | 100 NI | 100 NI | 100 AF | 100 CP | 100 NI | 100 NI | 100 NI | |
| Survey 3 | |||||||||||
| A | Whewellite | 70 | 70 | 30 | 40 | 40 | 55 | 0 | 25 | 60 | 0 |
| Apatite | 30 | 30 | 70 | 60 | 60 | 40 | 65 | 75 | 40 | 0 | |
| False analysis | - | - | - | - | - | 5 PR | 35 CaOx | - | - | 100 NI | |
| B | Struvite | 70 | 80 | 80 | 60 | 80 | 50 | 0 | 35 | 40 | 0 |
| Apatite | 30 | 20 | 20 | 40 | 20 | 40 | 25 | 65 | 60 | 0 | |
| False analysis | - | - | - | - | - | 10 PR | 75 MP | - | - | 100 NI | |
| C | Weddellite | 50 | 40 | 40 | 40 | 40 | 65 | 0 | 0 | 85 | 0 |
| Whewellite | 30 | 40 | 30 | 30 | 40 | 20 | 0 | 50 | 0 | 0 | |
| Apatite | 20 | 20 | 30 | 30 | 20 | 15 | 10 | 50 | 15 | 0 | |
| False analysis | - | - | - | - | - | - | 90 CaOx | - | - | 100 NI | |
| D | Struvite | 50 | 20 | 20 | 30 | 60 | 20 | 0 | 100 | 10 | 0 |
| Apatite | 30 | 70 | 70 | 70 | 30 | 70 | 45 | 0 | 75 | 0 | |
| Whewellite | 20 | 10 | 10 | 0 | 0 | 10 | 0 | 0 | 10 | 0 | |
| False analysis | - | - | - | - | 10 WD | - | 55 MP | - | 5 WD | 100 NI | |
| Survey 4 | |||||||||||
| A | Whewellite | 80 | 70 | 60 | 80 | 70 | 90 | 0 | 0 | 100 | 0 |
| Cystine | 20 | 30 | 40 | 20 | 30 | 10 | 50 | 95 | 0 | 100 | |
| False analysis | - | - | - | - | - | - | 50 CaOx | 5 BR | - | - | |
| B | Cholesterol | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 0 | 0 | 0 |
| False analysis | - | - | - | - | - | - | - | 100 CY | 100 NI | 100 NI | |
| C | Monosodium urate monohydrate | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 0 |
| False analysis | - | - | - | - | - | - | - | - | - | 100 NI | |
| D | Brushite | 70 | 80 | 80 | 80 | 70 | 65 | 80 | 100 | 0 | 0 |
| Whewellite | 30 | 20 | 20 | 20 | 30 | 35 | 0 | 0 | 0 | 0 | |
| False analysis | - | - | - | - | - | - | 20 CaOx | - | 100 WL | 100 NI | |
| Survey 5 | |||||||||||
| A | Apatite | 70 | 60 | 30 | 50 | 40 | 80 | 60 | 100 | 80 | 0 |
| Struvite | 30 | 30 | 70 | 40 | 60 | 15 | 0 | 0 | 15 | 0 | |
| False analysis | - | 10 WH | - | 10 WH | - | 5 WH | 40 MP | - | 5 PR | 100 NI | |
| B | Uricite | 70 | 50 | 80 | 60 | 50 | 60 | 0 | 0 | 85 | 0 |
| Uric acid dihydrate | 30 | 50 | 20 | 40 | 50 | 40 | 0 | 100 | 15 | 0 | |
| False analysis | - | - | - | - | - | - | 100 UA | - | - | 100 NI | |
| C | Calcite | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 0 | 0 |
| False analysis | - | - | - | - | - | - | - | - | 100 NI | 100 NI | |
| D | Uricite | 80 | 20 | 50 | 40 | 40 | 50 | 0 | 100 | 50 | 0 |
| Whewellite | 20 | 80 | 50 | 60 | 60 | 50 | 0 | 0 | 50 | 0 | |
| False analysis | - | - | - | - | - | - | 55 UA | - | - | 100 NI | |
| False analysis | - | - | - | - | - | - | 45 CaOx | - | - | - | |
| Survey 6 | |||||||||||
| A | Uricite | 70 | 70 | 60 | 70 | 60 | 60 | 0 | 0 | 80 | 0 |
| Whewellite | 30 | 30 | 40 | 30 | 40 | 40 | 0 | 0 | 20 | 0 | |
| False analysis | - | - | - | - | - | - | 45 CaOx | 100 NI | - | 100 NI | |
| False analysis | - | - | - | - | - | - | 55 UA | - | - | - | |
| B | Struvite | 70 | 50 | 70 | 70 | 70 | 55 | 0 | 35 | 40 | 0 |
| Apatite | 30 | 50 | 30 | 30 | 30 | 40 | 30 | 0 | 60 | 0 | |
| False analysis | - | - | - | - | - | 5 PR | 70 MP | 65 WL | - | 100 NI | |
| C | Brushite | 60 | 80 | 60 | 50 | 30 | 45 | 80 | 0 | 0 | 0 |
| Apatite | 40 | 20 | 40 | 50 | 70 | 55 | 20 | 65 | 30 | 0 | |
| False analysis | - | - | - | - | - | - | - | 35 ST | 70 WL | 100 NI | |
| D | Sucrose | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 0 | 0 | 0 |
| False analysis | - | - | - | - | - | - | - | 100 NI | 100 NI | 100 NI |
AF: artifact; AP: apatite; BR: brushite; CaOx: calcium oxalate (simplified analysis result); CP: calcium phosphate (simplified analysis result); CY: cystine; MP: magnesium ammonium phosphate (simplified analysis result); MU: monoammonium urate; NI: non-identifiable; PR: protein; ST: struvite; UA: uric acid (simplified analysis result); UD: uric acid dihydrate; WD: weddellite; WH: whewellite; WL: whitlockite