Introduction: Local anesthesia is a new method that in comparison with general anesthesia has fewer risks but metabolic response to stress of surgery in addition to increase of stress hormones in pregnant women causes increase in blood sugar. By starting analgesia with spinal anesthesia suddenly reducing catecholamines and cortisol concentration causes reduction in serum level of blood sugar.
Materials & Methods: Following taking history of mothers and obtaining satisfaction, monitoring and hydration (5ml / kg ringer solution), the mother's blood sugar level with glucometer controlled. Spinal anesthesia done with needle Quinke No. 24 by 3^cc of bupivacaine 0.5% in sitting position and then glucose was measured 15 min after spinal anesthesia and in recovery room.
Results: Ninety pregnant had a mean age of 29/93±5/9 years old with an average weight of 74/04±8/9 Kg , and the mean gestational age of 39/0±0.74 weeks. Mean changes in blood glucose during the first 15 minutes and the mean change between before spinal and in recovery room in the three groups that have different NPO time was not significant. (P 0.713 and 0.87). Average glucose before anesthesia 90.74±19 and after it 88.42±18.9 were not significantly different (P=0.103), but difference between mean blood glucose before-anesthetic and in recovery room 96.16 ± 21 was significant (P=0.001).
Conclusion: In comparison between blood sugar before  anesthesia and in recovery room , significant increase of blood sugar in recovery existed not in hyperglycemic range. Therefore, during spinal anesthesia with bupivacaine, monitoring of blood sugar was not necessary.