研究目的：排尿日誌是評估下尿路功能不可或缺的一部份，本研究希望評估由排尿日誌所作的臨床診斷與尿動力學結果之相關性。材料與方法：一百位具有下尿路症狀的病人經由指示記錄三日排尿日誌，每一位病人均記錄其喝水及排尿的時問和容量，以及感覺急尿或發生尿急失禁的次數，根據其臨床發現診斷為正常膀胱、超敏感性膀胱、膀胱過動症、多喝水性多尿症，或是夜間多尿症，其中三十六位病人接受了尿動力學檢查以進一步評估其下尿路功能異常，依其尿動力學檢查分類為正常膀胱，逼尿肌活性過強，或是膀胱超敏感性。我們分析臨床診斷與尿動力學結果之相關性。結果：所有的病人中有75位（75%）在三日排尿日誌中排尿次數的變異性為±2次以下， 24 位病人具夜間多尿症，36位具膀胱超敏感性，56位則診斷具有膀胱過動症。在所有病人中，62位膀胱容量小於 350ml，38位具正常膀胱容量。在 38 位正常膀胱容量病人中12位（3l,6%）具膀胱過動症，62位膀胱容量小病人中44位（71%)具膀胱過動症(P<0.05）。在 19 位臨床診斷為膀胱過動症病人中，7位（36.8%）具尿動力學之逼尿肌活性過強，而在 17 位無膀胱過動症病人中，7位（41.2%）具逼尿肌活性過強中(P＞0.05）。結論：本研究結果顯示三日排尿日誌對臨床診斷下尿路症狀很有幫助。利用三日排尿日誌具高度可重複性，而且排尿次數變異很少。然而，不論是排尿日誌或尿動力學檢查均不能反應病人最大膀胱容量或逼尿肌活性過強。

OBJECTIVE: Voiding diary is an indispensable part of lower urinary tract assessment. The aim of this study was to evaluate the correlation of clinical diagnoses made using 3-day voiding diaries with urodynamic results. MATERIALS AND METHODS: One hundred patients with lower urinary tract symptoms were instructed to keep a 3-day voiding diary. Patients were instructed to record the time and volume of their water intake, voided urine volume, and number and time of sensation of urgency and episodes of urge incontinence. Patients were diagnosed according to their clinical findings as having a normal bladder, hypersensitive bladder, overactive bladder, polydipsia polyuria, or nocturnal polyuria. Thirty-six patients underwent a urodynamic study to further assess their lower urinary tract dysfunction, for which urodynamic results were classified as a normal bladder, detrusor overactivity, or bladder hypersensitivity. The clinical diagnoses and urodynamic results were correlated. RESULTS: Among these patients, 75 (75%) had a variability of ± less than 2 times per day in voiding frequency within the 3 days. Twenty-four patients (24%) had nocturnal polyuria, increased bladder sensation was noted in 36 patients, and overactive bladder was noted in 56 patients. Among the total patients, 62 had reduced bladder capacity, whereas 38 had a normal bladder capacity. Among the 38 patients with a normal bladder capacity, 12 (31.6%) had an overactive bladder, whereas among the 62 patients with reduced bladder capacity, 44 (71%) had an overactive bladder (p < 0.05). Urodynamic detrusor overactivity was found in 7 (36.8%) of 19 patients who had a clinical diagnosis of an overactive bladder and in 7 (41.2%) of 17 patients without a clinical diagnosis of an overactive bladder (P> 0.05). CONCLUSIONS: This study shows that a 3-day voiding diary is helpful in diagnosing lower urinary tract symptoms. Voiding diaries using 3 days of records have a good reproducibility rate and little variability. However, neither voiding diary nor urodynamic study can reflect the maximum bladder capacity or detrusor overactivity.