您的「肺功能成績單」怎麼看？ How to Read Your “Lung Function Report Card”?
一次搞懂肺功能檢查報告 Understanding Your Pulmonary Function Test Report
肺功能檢查(PFTs)，就像是為您的呼吸系統做一次全面的「性能檢測」。它不痛、不抽血，只需要您配合指令，用力吸氣、吐氣，就能得到一份詳細的「肺部健康成績單」。 A Pulmonary Function Test (PFT) is like a comprehensive “performance check” for your respiratory system. It’s painless, doesn’t require a blood draw, and simply asks you to follow instructions to inhale and exhale forcefully to get a detailed “lung health report card.”
這份指南就是要教您如何看懂成績單上的三大科目：肺量計、肺容積、肺瀰散量，讓您成為自己呼吸健康最了解的夥伴！ This guide will teach you how to read the three main sections of the report: Spirometry, Lung Volumes, and Diffusing Capacity, empowering you to become the most knowledgeable partner in your own respiratory health!
肺功能報告「三步驟」解碼流程 The Three-Step Process to Decode Your PFT Report
判讀肺功能報告，就像偵探辦案，需要遵循一個有邏輯的流程。跟著以下三步驟，您也能像專家一樣，快速掌握重點！ Interpreting a PFT report is like a detective case that requires a logical process. Follow these three steps to quickly grasp the key points, just like an expert!
1
先看「FEV1/FVC」比值 — 有沒有阻塞？ First, Look at the “FEV1/FVC” Ratio — Is There an Obstruction?
這是判讀的第一步，也是最關鍵的一步！這個比值代表您「第一秒吐出的氣量」佔「總吐氣量」的百分比。 This is the first and most crucial step in the interpretation process! This ratio represents the percentage of your “exhaled air in the first second” relative to your “total exhaled volume.”
- 如果這個比值低於正常值（通常是70%），就代表您的氣流吐出時遇到了阻力，也就是所謂的「阻塞性通氣障礙」。 If this ratio is below the normal range (usually 70%), it means your airflow is encountering resistance during exhalation, a condition known as an “obstructive ventilatory defect.”
2
再看「FVC」和「TLC」— 肺容積夠不夠？ Next, Look at “FVC” and “TLC” — Are the Lung Volumes Sufficient?
在確認沒有阻塞後，我們接著看您的肺活量（FVC）和肺總量（TLC）。 After confirming there is no obstruction, we look at your Forced Vital Capacity (FVC) and Total Lung Capacity (TLC).
- 如果您的肺總量(TLC)低於正常值，就代表您的肺部擴張受到了限制，這就是「限制性通氣障礙」。 If your Total Lung Capacity (TLC) is below the normal range, it means your lung expansion is restricted, a condition known as a “restrictive ventilatory defect.”
- 專業提示：單純看肺活量(FVC)下降不一定準確，因為嚴重的阻塞也會讓氣吐不乾淨，導致FVC下降。TLC才是確診限制性問題的黃金標準！ Pro Tip: A drop in FVC alone isn’t always accurate, because severe obstruction can also prevent you from exhaling completely, causing FVC to drop. TLC is the gold standard for definitively diagnosing a restrictive problem!
3
最後看「DLCO」— 氣體交換效率好不好？ Finally, Look at “DLCO” — How Efficient is Gas Exchange?
DLCO是評估您的肺泡將氧氣交換到血液中的「效率」。這個指標能幫助我們進一步找出問題的根源。 DLCO evaluates the “efficiency” of your lungs’ alveoli in exchanging oxygen into the blood. This marker helps us further pinpoint the root cause of the problem.
- 阻塞 + DLCO下降：強烈指向「肺氣腫」，因為肺泡結構被破壞了。 Obstructive + Decreased DLCO: Strongly suggests “emphysema,” as the alveolar structures are damaged.
- 阻塞 + DLCO正常/升高：比較可能是「氣喘」或單純的支氣管炎。 Obstructive + Normal/Increased DLCO: More likely to be “asthma” or simple bronchitis.
- 限制 + DLCO下降：代表問題出在肺部「內部」，例如肺纖維化。 Restrictive + Decreased DLCO: Indicates the problem is “internal” to the lungs, such as pulmonary fibrosis.
- 限制 + DLCO正常：代表肺本身是好的，問題可能來自「外部」的壓迫，例如胸廓變形或神經肌肉無力。 Restrictive + Normal DLCO: Suggests the lungs themselves are healthy, and the problem likely stems from “external” compression, such as chest wall deformity or neuromuscular weakness.
當氣流「塞車」了：阻塞性肺病大解析 When Airflow is “Blocked”: A Deep Dive into Obstructive Lung Disease
「支氣管擴張劑」測試：區分氣喘和COPD的照妖鏡 The “Bronchodilator” Test: The Magic Mirror for Distinguishing Asthma from COPD
當報告顯示有阻塞時，醫師會讓您吸入支氣管擴張劑再測一次。如果您的FEV1數值有顯著的進步（增加12%且超過200毫升），代表您的氣道阻塞是「可逆的」，這強烈指向氣喘。如果改善不明顯，則比較可能是慢性阻塞性肺病(COPD)。 When the report indicates an obstruction, your doctor will have you inhale a bronchodilator and re-test. If your FEV1 value shows significant improvement (an increase of 12% and more than 200 mL), it means your airway obstruction is “reversible,” strongly suggesting asthma. If there is little improvement, it is more likely to be Chronic Obstructive Pulmonary Disease (COPD).
當肺部「打不開」了：限制性肺病大解析 When Your Lungs “Can’t Open Up”: A Deep Dive into Restrictive Lung Disease
限制性肺病的特徵是肺總量(TLC)下降。就像前面提到的，DLCO是區分內、外因性的關鍵！ The characteristic feature of restrictive lung disease is a decrease in Total Lung Capacity (TLC). As mentioned earlier, DLCO is key to distinguishing between internal and external causes!
一個有趣的現象是：對於胸廓變形等外因性問題，雖然總的DLCO會下降（因為肺被壓縮了），但如果計算單位肺泡容積的交換效率(Kco)，反而常常是正常甚至偏高的。這個「低DLCO、高Kco」的組合，是外因性限制的有力證據。 An interesting phenomenon is that for external problems like chest wall deformities, although the total DLCO decreases (because the lungs are compressed), the gas exchange efficiency per unit of alveolar volume (Kco) is often normal or even elevated. This combination of “low DLCO, high Kco” is strong evidence for an external cause of the restriction.
結論：報告是地圖，您是領航員 Conclusion: The Report is a Map, and You are the Navigator
一份肺功能報告，不是一份冰冷的判決書，而是一張詳細的「健康地圖」，它用客觀的數據描繪出您呼吸系統的運作狀態。 A pulmonary function report is not a cold verdict; it’s a detailed “health map” that uses objective data to chart the operational status of your respiratory system.
它的價值在於與您的症狀、病史和影像學檢查（如X光）結合，拼湊出完整的臨床圖像。 Its value lies in combining it with your symptoms, medical history, and imaging tests (like X-rays) to piece together a complete clinical picture.
了解如何閱讀這張地圖，能讓您更有信心地與醫師溝通，共同規劃出通往呼吸健康的最佳路徑。您，就是自己健康旅程中最重要的領航員！ Learning how to read this map will give you the confidence to communicate with your doctor, and together, you can plan the best route to respiratory health. You are the most important navigator on your health journey!
