Blood Glucose Monitoring in Patients Without Fingers

Immediate Practical Solutions

Arterial sampling provides the most accurate glucose measurements and is most similar to laboratory plasma values in paired samples, according to the American College of Critical Care Medicine 1
Venous specimens are also acceptable, with care taken to avoid contamination from IV fluid infusing through multilumen catheters, as recommended by the American College of Critical Care Medicine 1
Both arterial and venous samples can be tested using standard glucose meters or blood gas analyzers, as stated by the American College of Critical Care Medicine 1
The American College of Critical Care Medicine recommends that this approach be prioritized over capillary sampling in critically ill patients 1
Factory-calibrated CGM systems, such as Dexcom G6/G7 or FreeStyle Libre, completely eliminate the need for fingerstick testing, as reported by the European Association for the Study of Diabetes 2
These devices use subcutaneous sensors that measure interstitial glucose every 1-5 minutes with minimal lag time, according to the European Association for the Study of Diabetes 2

The American College of Critical Care Medicine advises against using alternative capillary sites in patients with shock, hypotension, on vasopressor therapy, or with severe peripheral edema 1
Glucose meter performance can deviate from laboratory control by >20% in critically ill patients, regardless of blood source, as noted by the American College of Critical Care Medicine 1
The American College of Critical Care Medicine recommends that each institution evaluate meter performance in various patient populations 1
Blood gas analyzers may provide more reliable results than portable meters in critically ill patients, according to the American College of Critical Care Medicine 1

The European Association for the Study of Diabetes recommends implementing factory-calibrated CGM system (Dexcom G6/G7 or FreeStyle Libre) for continuous monitoring without any fingerstick requirement 2
If CGM is unavailable and patient has arterial or central venous access, the American College of Critical Care Medicine suggests using arterial or venous blood sampling with standard glucose meter or blood gas analyzer 1
For insulin-dependent patients, the American Diabetes Association strongly advocates for CGM coverage, as these systems provide real-time alerts and can integrate with insulin pumps, although this specific citation is from Praxis Medical Insights, a similar recommendation can be found from other sources 3