There are multiple definitions:
nested polymerase chain reaction(English)
- diagnostic test for viral infection
- PCR
- Virology, Diagnostics
- https://doi.org…7/AJB2016.15849
normalized protein catabolic rate(English)
- reflects the daily protein intake in maintenance hemodialysis (MHD) patients
- nPNA, PCR, MHD
- Nephrology, Proteins / proteomics, Nutrition
- https://doi.org…jren.2003.50005