High Power Amplifier 
Health Protection Agency 
Hand Posture Analyzer 
High-Power Amplifier 
Human Protein Atlas 
hypothalamic-pituitary-adrenal 
Handling and Positioning Aid 
Hanoi Plan of Action 
Health Policy and Administration 
Helix pomatia agglutinin 
High Performance Addressing 
High-Pressure Air 
High-Purity Air 
Hi-vision Promotion Association 
Holding and Positioning Aid 
hybridization protection assay 
Hydraulic project approval 
Hypophyseal-pituitary axis 
hypothalamic pituitary axis 
h post activation 
Habilitation Plan Administrator 
habitual physical activity 
haemangiopericytoma 
Haemophilus parainfluenzae 
Hard Physical Address 
Hawaii Preparatory Academy 
Hazardous Products Act 
head of a procuring activity 
Head of Processing Activity 
Head of Processing Activity Head of Pr…