Parameters:
(1) absolute neutrophil count in 10^3/µL or 10^9/L
(2) platelet count in 10^3/L or 10^9/L
neutrophil to platelet ratio =
= (absolute neutrophil count) / (platelet count)
This results in a number such as 0.025.
Wei et al modified the score by multiplying it by 1000 (0.025 becomes 25).
Interpretation:
• The ratio may be elevated with an elevated neutrophil count and/or decreased platelet count.
• The ratio may be depressed with a decreased neutrophil count and/or elevated platelet count.
• A number of adverse outcomes are associated with an elevated NPR (in-hospital mortality, long-term mortality, MACE events).
• Somaschini et al reported an NPR > 0.045 to be associated with 30-day mortality following STEMI.
