血檢後醫生說此生只能吃腎貓飼料 - 貓

By Frederica
at 2020-06-20T22:18
at 2020-06-20T22:18
Table of Contents
推文有討論到要不要驗SDMA的問題,在這邊跟大家解釋獸醫/獸醫系學生的思考邏輯
先說結論,要驗SDMA不是不行,但在這個Case的情況下有點多餘,原因後釋。
首先SDMA 相較於Crea來說比較敏感,可以在腎臟失去25-40%功能的時候就檢測出來,
至於Crea 則是至少要腎臟失去67%以上的功能時才會在血檢報告上看出來。
所以
高SDMA --> Crea 不一定會高
但
高CREA --> SDMA 99.9% 會超標
那為什麼我們會說SDMA在這個case意義不大呢?
首先,患者已經有精神不振的臨床症狀與CREA/BUN異常,綜合這些資訊我們第一直覺會
想到是腎臟疾病,但我們還缺乏一個很重要的指標: USG
通常我們看到高CREA/BUN,必須先確定造成CREA/BUN高的原因是什麼,是真的腎病?
還是只是單單脫水? 又或者是尿道阻塞? 而 USG 可以幫助我們進一步去分析。
若USG正常,則代表腎臟還能濃縮尿液,那這個情況下造成高CREA/BUN的情況就比較可能
是脫水,或是非腎臟疾病造成的氮血症(Azotaemia)。
若USG低於正常值,則代表腎臟已經失去濃縮尿液的功能,進而造成高CREA/BUN 的情形。
-----------------------------------------------------------------------------
回到這個Case,若造成初檢高Crea/BUN的原因是我們懷疑的腎病,那複檢Crea/BUN 有非
常大的機率還是會超標,我們只需要低USG來確認。這個情況下,既然Crea已經超標,那
SDMA 必然也會超標,所以沒有太大意義。
那若是初檢的原因是脫水呢? 這個情形下假設複檢時的Hydration status 正常,
那 Crea/BUN 跟USG 都理應落在正常範圍值,也代表腎臟還具有濃縮尿液的功能。
若病患沒有臨床症狀,然後上述的數值又都正常,那驗SDMA就只是為了檢測早期腎臟功能
喪失,該不該驗呢? 若真的很想知道病患的腎臟功能,可以,但貴,值不值得就看個人。
------------------------------------------------------------------------------
綜合而論,診斷腎臟疾病需要"至少"臨床症狀、血檢、尿檢,如果想知道早期腎臟功能
喪失的話SDMA是很好的指標,但若Crea/BUN 已經超標的話,驗SDMA則無太大意義。
--
先說結論,要驗SDMA不是不行,但在這個Case的情況下有點多餘,原因後釋。
首先SDMA 相較於Crea來說比較敏感,可以在腎臟失去25-40%功能的時候就檢測出來,
至於Crea 則是至少要腎臟失去67%以上的功能時才會在血檢報告上看出來。
所以
高SDMA --> Crea 不一定會高
但
高CREA --> SDMA 99.9% 會超標
那為什麼我們會說SDMA在這個case意義不大呢?
首先,患者已經有精神不振的臨床症狀與CREA/BUN異常,綜合這些資訊我們第一直覺會
想到是腎臟疾病,但我們還缺乏一個很重要的指標: USG
通常我們看到高CREA/BUN,必須先確定造成CREA/BUN高的原因是什麼,是真的腎病?
還是只是單單脫水? 又或者是尿道阻塞? 而 USG 可以幫助我們進一步去分析。
若USG正常,則代表腎臟還能濃縮尿液,那這個情況下造成高CREA/BUN的情況就比較可能
是脫水,或是非腎臟疾病造成的氮血症(Azotaemia)。
若USG低於正常值,則代表腎臟已經失去濃縮尿液的功能,進而造成高CREA/BUN 的情形。
-----------------------------------------------------------------------------
回到這個Case,若造成初檢高Crea/BUN的原因是我們懷疑的腎病,那複檢Crea/BUN 有非
常大的機率還是會超標,我們只需要低USG來確認。這個情況下,既然Crea已經超標,那
SDMA 必然也會超標,所以沒有太大意義。
那若是初檢的原因是脫水呢? 這個情形下假設複檢時的Hydration status 正常,
那 Crea/BUN 跟USG 都理應落在正常範圍值,也代表腎臟還具有濃縮尿液的功能。
若病患沒有臨床症狀,然後上述的數值又都正常,那驗SDMA就只是為了檢測早期腎臟功能
喪失,該不該驗呢? 若真的很想知道病患的腎臟功能,可以,但貴,值不值得就看個人。
------------------------------------------------------------------------------
綜合而論,診斷腎臟疾病需要"至少"臨床症狀、血檢、尿檢,如果想知道早期腎臟功能
喪失的話SDMA是很好的指標,但若Crea/BUN 已經超標的話,驗SDMA則無太大意義。
--
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