TABLE 4.
Summary of recent experiences with culturing of apheresis-derived platelets at three large blood centersa
| Center | No. (rate) of resultsb |
||
|---|---|---|---|
| True positive | False positive | No. tested | |
| New York Blood Center | 5 (1/4,101) | 5 (1/4,101) | 20,506 |
| Florida Blood Services | 6 (1/1,790) | 5 (1/2,147) | 10,737 |
| Puget Sound Blood Center | 5 (1/1,800) | 15 (1/600) | 8,999 |
| Total | 16 (1/2,515) | 25 (1/1,610) | 40,242 |
b
True positive = positive bottles in which an organism was identified and a repeat sample from the bag or a retention sample also contained the same organism. False positive = positive bottles that contained no organism (machine false positive) or from which the organism could not be reisolated from the original bag or a retained sample.