Hyperglycemia is common in critically ill patients
Depending on the underlying condition (e.g. DKA), you may be instituting an insulin drip and following frequent fingersticks in the ED
A recent study indicates that bedside glucose values may not accurately reflect serum values in approximately 15% of critically ill patients
This is more likely to occur in patients with poor peripheral perfusion
Take Home Point: Interpret bedside glucose readings with caution especially in hypotensive critically ill patients
References
Desachy A, et al. Accuracy of Bedside Glucometry in Critically Ill Patients: Influence of Clinical Characteristics and Perfusion Index. Mayo Clin Proc 2008;83:400-5.
