Final answer:
A voiding diary is the best tool to guide therapy for pollakuria, aiding in understanding urination patterns and identifying contributing factors.
Step-by-step explanation:
The tool most commonly used to guide therapy for pollakuria (frequent daytime urination) is a voiding diary. This diary helps both the patient and healthcare provider to understand the patterns of urination and to rule out underlying conditions. The patient tracks the times and amounts of urination, as well as associated symptoms and fluid intake, which can help identify any triggers or lifestyle factors that may contribute to the symptoms. In conjunction with a voiding diary, further medical evaluation may include urinalysis, ultrasound, and urodynamics to identify any anatomical or functional abnormalities of the urinary system.