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? asked in 社會與文化語言 · 1 decade ago

[生物][英文]HIV ELISA 愛滋病 有看沒有懂T_T

(1) The real blood donor pool, which has already been screened for HIV risk factors before they are even allowed to donate blood, so that the HIV sero-prevalence in this population is closer to .1% instead of 1%. How does this change the numbers -- for every 1,000,000 blood donors, 1,000 are HIV positive. Again using a sensitivity of 99.9%, the ELISA would pick up 999 of those thousand, leaving one individual who was HIV sero-positive to slip through the cracks. Of the 999,000 individuals who were not infected, the test would call 998,001 individual sero-negative (true negatives). The ELISA would, however, falsely label 999 individuals as sero-positive (false-positives). Testing the blood donor pool results in as many false positive as true positive results.




2 Answers

  • 1 decade ago
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    他說愛滋病應為 捐血人要先驗血的關係從1%的人口變誠0.1%

    1000000捐血人裡有1000人都有愛滋病 應為先驗血的關係停只了不少愛滋病捐血人捐血 ELISA會抓那999個愛滋病捐血人 留下 999,000沒愛滋病捐血人並抓=其中999個人 然候用他們捐的血 這叫做 998001人刪除監驗

    Source(s): Me 13歲 在美國
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  • 1 decade ago


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