Low perfusion index affects the difference in glucose level between capillary and venous blood. - Acar, Nurdan; Ozcelik, Hamit; Alper Cevik, Arif; Ozakin, Engin; Yorulmaz, Goknur; Kebapci, Nur; Bilge, Ugur; Bilgin, Muzaffer (Therapeutics & Clinical Risk Management, 2014)