| Without computerized display | With computerized display | |||
|---|---|---|---|---|
| Test | Number of tests | Charge | Number of tests | Charge |
| Total | 553 | $13,994 | 510 | $12,171 |
| Electrolyte analysis | 232 | $4,988 | 214 | $4,596 |
| Blood count | 145 | $1,959 | 135 | $1,817 |
| Chest x-ray | 69 | $3,493 | 59 | $3,014 |
| Electrocardiogram | 40 | $1,799 | 26 | $1,167 |
| Urinalysis | 32 | $275 | 36 | $310 |
| Leukocytes | 25 | $272 | 22 | $244 |
| Urine culture | 8 | $163 | 13 | $263 |
| Upper gastrointestinal | 7 | $1,045 | 5 | $760 |
Source: Tierney WM, McDonald CJ, Martin DK, et al. Computerized display of past test results. Ann Intern Med 1987; 107(4):569-74.