The ratio of the platelet distribution width (PDW) to platelet count is one of the platelet volume indices and may have some prognostic information in some situations.


(1) platelet distribution width in percent

(2) platelet count in 10^4/µL


ratio of PDW to PC =

= (PDW) / (PC)



An elevated ratio indicates is associated with an elevated PDW and/or lower platelet count.

Takeuchi et al identified an elevated ratio (>= 0.59) associated with a worse prognosis.

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