Denmark Study: Continuous vs. Finger-Stick Glucose Checks in ICU

A Study from Denmark Is Asking a Critical Question About ICU Blood Sugar Monitoring

A study from Denmark is setting out to answer one of intensive care medicine's most pressing questions: should critically ill hospital patients wear continuous glucose monitors (CGM) instead of relying on traditional finger-stick blood sugar checks? Researchers at Copenhagen University Hospital – North Zealand in Hilleroed have registered a formal protocol for a systematic review and meta-analysis that will pool data from multiple randomized clinical trials worldwide to find out.

Why Denmark's Perspective Matters for US Patients

Scandinavia has long been a global leader in ICU care protocols and patient safety research. Denmark's universal healthcare system allows researchers to study large, diverse ICU populations with consistent data collection — something that is harder to achieve across the fragmented US hospital landscape. When Danish researchers synthesize global evidence, American clinicians and patients benefit from conclusions drawn across multiple healthcare systems, making the findings broadly applicable to US intensive care units.

The Blood Sugar Problem in the ICU

When patients are critically ill, blood sugar control becomes extremely difficult. Both high blood sugar (hyperglycemia) and dangerous low blood sugar (hypoglycemia) — defined as below 70 mg/dL (3.9 mmol/L) — are linked to increased risk of death and serious complications. Current US guidelines from the Society of Critical Care Medicine recommend keeping ICU blood glucose between 140–180 mg/dL (7.8–10.0 mmol/L), typically managed through intermittent finger-stick or blood draw checks every 1–4 hours.

The problem? A lot can happen to blood sugar between those checks. A patient could silently drop to 40 mg/dL (2.2 mmol/L) — a life-threatening level — without nurses knowing until the next scheduled test.

What Continuous Glucose Monitors Could Change

CGM devices, already familiar to millions of American diabetes patients wearing devices like Dexcom or FreeStyle Libre, measure glucose every few minutes around the clock. The Danish research team hypothesizes that using CGM in the ICU could:

• Reduce the number of dangerous hypoglycemic episodes
• Improve overall blood sugar stability
• Potentially lower mortality rates among critically ill patients

The review's primary outcome is mortality — the most patient-important measure possible. The secondary focus is the frequency of hypoglycemic events, directly relevant to anyone with diabetes who may one day face an ICU admission.

How the Research Will Be Conducted

The team will search five major medical databases including PubMed and Cochrane, evaluate study quality using the gold-standard Cochrane Risk of Bias 2 tool, and grade the strength of evidence using the internationally recognized GRADE system. This rigorous methodology means US clinicians can trust the conclusions.

Why This Matters for US Patients

Approximately 30% of ICU patients in the United States have diabetes, and many more develop stress-related hyperglycemia during critical illness. If this Danish-led review confirms that CGM reduces hypoglycemic episodes and saves lives, it could directly pressure US hospitals and Medicare policy to fund CGM devices for ICU use — technology that most American ICUs do not currently deploy routinely. For diabetes patients and their families, this research could mean safer hospital stays and fewer silent blood sugar crises during their most vulnerable moments.

Citation

Nielsen, Grigonyte-Daraskeviciene, Blem. "Effects of Continuous Versus Intermittent Glucose Monitoring in Intensive Care Unit Patients: Protocol for a Systematic Review With Meta-Analysis." Acta Anaesthesiologica Scandinavica, 2025. PMID: 40548566. DOI: 10.1111/aas.70086