Table 2.
Summary of disagreements in critical range and values outside of acceptable comparative range between laboratory and POCT by analyte and manufacturer
| Critical Range Disagreement | ||||
| Analyte | Lab to i-STAT | Lab to epoc | epoc to i-STAT | Total |
| Sodium | 1/101 | 1/102 | 2/101 | 4/304 (1.3%) |
| Potassium | 2/101 | 0/101 | 1/100 | 3/302 (1.0%) |
| Chloride | n/a | n/a | n/a | n/a |
| Creatinine | n/a | n/a | n/a | n/a |
| Hematocrit | n/a | n/a | n/a | n/a |
| Hemoglobin | 0/83 | 0/84 | 0/100 | 0/267 (0.0%) |
| Glucose | ||||
| < 5 mmol/L | 0/8 | 0/8 | 0/8 | 0/24 (0.0%) |
| ≥ 5 mmol/L | 0/29 | 0/29 | 0/92 | 0/150 (0.0%) |
| Total | 3/322 (0.9%) | 1/324 (0.3%) | 3/401 (0.7%) | 7/1047 (0.7%) |
| p = 0.323* | ||||
| Outside of the Laboratory to POCT Acceptable Comparative Range | ||||
| Analyte | Lab to i-STAT | Lab to epoc | epoc to i-STAT | Total |
| Sodium | 2/101 | 2/102 | 1/101 | 5/304 (1.6%) |
| Potassium | 10/101 | 9/101 | 1/100 | 20/302 (6.6%) |
| Chloride | 5/101 | 14/101 | 10/100 | 29/302 (9.6%) |
| Creatinine | 4/100 | 10/98 | 7/98 | 21/296 (7.1%) |
| Hematocrit | 0/83 | 17/84 | 3/100 | 20/267 (7.5%) |
| Hemoglobin | n/a | n/a | n/a | n/a |
| Glucose | ||||
| < 5 mmol/L | 5/8 | 2/8 | 3/8 | 10/24 (41.7%) |
| ≥ 5 mmol/L | 6/29 | 2/29 | 13/92 | 21/150 (14.0%) |
| Total | 32/523 (6.1%) | 56/523 (10.7%) | 38/599 (6.3%) | 126/1645 (7.7%) |
| p = 0.007* | ||||
Note: POCT Point of care testing device
*Two sample test of proportions between i-STAT® compared with laboratory, and epoc® compared with laboratory