What does PFR stand for?

prueba de función respiratoria (Spanish: Respiratory Function Tests)

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Primary Fundamental Right Prime de Fonction et de Résultat (French: Prime Function and Outcome) Prime Focal Ratio Problem Fault Report Professional and Financial Regulation Professional Fundraiser Program Financial Review Programmable Frequency Receiver Project Feasibility Report Promoting First Relationships (child development program)		Public Finance Review Public Fishing Rights (New York State Department of Environmental Conservation) Pulse Repetition Frequency Purchase for Resale (sales classification) Patch-Fed Rod Antenna Prairie Farm Rehabilitation Administration (Canada) Preliminary Flood Risk Assessment (Rivers Agency; UK) Professional Football Researchers Association Prudential Financial Regulatory Agency Public Fundraising Regulatory Association (UK)