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A middle-aged adult patient, previously diagnosed with bronchiectasis, is visiting the nurse practitioner due to an increase in sputum production. The NP contemplates the need to assess and quantify the patient's sputum production. Which of the following methods is frequently employed for this purpose in routine clinical practice?
a) Peak expiratory flow rate (PEFR)
b) Sputum color assessment
c) Utilize a sputum cup
d) Forced vital capacity (FVC)