快篩陽=確診?陳其邁:高雄現盛行率不高 - 高雄
By Isla
at 2022-04-30T00:48
at 2022-04-30T00:48
Table of Contents
1.完整新聞連結 (或短網址): 連結過長時可提供短網址方便網友點擊。未提供者警告
https://news.ltn.com.tw/amp/news/life/breakingnews/3910377
2.完整新聞標題: 標題沒有寫出來,依照板規刪除文章
快篩陽=確診?陳其邁:高雄現盛行率不高 驗PCR日量能最高4.5萬件
3.媒體資訊(媒體來源與作者)、日期:
日期:2022-4-29 22:15
媒體:自由時報
作者:記者許麗娟
媒體來源如:蘋果日報、中央社
作者定義:1.自然人 2.撰稿人或主編
缺少任一媒體資訊,將依新聞文規定,文章退回。
4.完整新聞內容:
〔記者許麗娟/高雄報導〕雙北疫情延燒,新北市今天(29日)逾4000例,台北市也破20
00例,由於雙北市的醫院PCR採檢量能吃緊,拋出快篩陽性等於確診,高雄市長陳其邁今
在防疫記者會表示,高雄現在快篩的陽性預測值很低,因為盛行率不高,但若疫情往上一
直走,當盛行率增加到10%,快篩的陽性預測值就會從47.6%增加到90.1%,而目前高雄市P
CR採檢量能,每天最高達4.5萬件。
陳其邁指出,高雄港群聚感染時,當時1天PCR檢驗超過3萬件,量能還足夠,但是現在個
案多,一般PCR是10個人1支來做,量可以增加很多,假如1天3班可以做近10萬件,但這是
理論值,實際上不可能,因為有陽性要另挑出來重做,假如量能全開的話,1天3班每班1.
5萬件、3班4.5萬件。
他在去年就要求四大醫學中心趕快增加檢驗量能,所以依照高雄市預估,假如全台灣單日
確診數4.5萬例,高雄市約5260例,若疫情又快速增加,高雄到1.4萬例時,PCR檢驗量能
都還夠,不過當疫情盛行率高時,到時快篩試劑陽性率也就會高。
陳其邁說,快篩和PCR是不是可以取代?與陽性預測值和盛行率有關,在低盛行率的地方
,若盛行率是千分之1,陽性預測值才10,意思是檢查100件快篩陽性,真正確診只有10件
,所以陽性預測值10%很低,但當盛行率越來越高到5分之1時,陽性預測值會有9成,如10
個快篩陽性會驗到9個PCR陽性確診。
高雄人口是276萬人,以盛行率來推算,用90%敏感性和99%特異性,推估盛行率1%時,陽
性預測值47.6%,高雄現在陽性預測值很低,因為盛行率不高,但當盛行率來到10%,高雄
會有27.6萬人染疫,陽性預測值就會從47.6%增加到90.1%,所以快篩試劑就會很準,錯誤
匡列機率就降低。
陳其邁說,疫情在一開始確診案件還不多時,用快篩試劑要取代PCR檢測的錯誤率會提高
,但疫情流行到10-30%時,快篩試劑和PCR檢測的陽性預測值就會相當高,簡單講 PCR和
快篩就差不多,目前高雄快篩陽性的預測值都低於50%以下,意思就是在高雄的Covid-19
盛行率不高。
https://i.imgur.com/W0rwrj0.jpg
盛行率會影響快篩的陽性預測值,當千分之1時,100件快篩陽性,真正確診只有10件,當
盛行率到5分之1時,陽性預測值會有9成,即10個快篩陽性會驗到9個PCR陽性確診。(高
雄市政府提供)
備註: 一個人一天只能張貼一則新聞。被刪或自刪也算額度內,超貼者退文處理
盛行率如果10%,快篩預測的準確率會有9成
高雄276萬,所以10%達27.6萬,只要高雄人口確診數累積到27.6萬,快篩準確率就會到9
成是吧?
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