Aim : To compare  gingival crevicular blood and finger prick blood glucose measurements using self monitoring device.

Methods :30 gingivitis and 30 periodontitis patients were enrolled in the study. Blood oozing from the gingival crevices of anterior teeth following periodontal probing(GCF–B) and finger prick blood(FPB) was taken and was analysed by self monitoring device(Accucheck).

Results : There was significant positive correlation between the two readings for both gingivitis (r=0.901, p=0.000<0.05) and periodontal patients (r=0.981, p=0.000<0.05).  The paired t test showed a significant difference in the readings for both gingivitis patients (t=13.773, p<0.05) and periodontal patients (t=9.078, p<0.05). There was significant difference between the blood glucose level readings drawn from index finger and gingivialcervicular for ginigivitis patients (t=13.773, p<0.05) and periodontal patients (t=9.078, p<0.05). This study concludes that though there is significant positive correlation existing between the two readings, there is significant difference between the readings.

Conclusion :Blood obtained during routine periodontal probing cannot be used for estimation of blood glucose levels in periodontitis patients.