Initiation of Inpatient Continuous Glucose Monitoring for Select Patients at High Hypoglycemia Risk

STEP 1 — Gather Information

Assess for high-risk hypoglycemia criteria: impaired awareness of hypoglycemia, age ≥65, type 1 diabetes, high-dose steroids, parenteral/enteral nutrition, isolation for contagious disease, CKD stage 3-5 or liver disease, comorbid conditions (cerebrovascular accident, malignancy, CHF, pancreatic disorder, infection), or history of preadmission/current hypoglycemia.
Document presence of any high-risk criterion.

STEP 2 — Rule In / Rule Out

Exclude patients with contraindications: hypotension/vasoconstriction, severe dehydration requiring vasopressors, edema/anascara, DKA/severe hyperglycemia, or substances interfering with CGM accuracy (e.g., vitamin C >4 g/day, hydroxyurea).
If patient meets any high-risk criterion and has no contraindications, proceed to CGM initiation; otherwise, rely on point-of-care glucose monitoring alone.

STEP 3 — Classify or Stratify

Classify all selected patients as requiring hybrid CGM use with periodic point-of-care glucose validation for accuracy.

STEP 4 — Decide

Initiate inpatient CGM device (e.g., Dexcom G6, Freestyle Libre), arrange for twice-daily point-of-care glucose checks for calibration/validation, ensure staff training and patient education on device use and alert response, integrate CGM data with the hospital EHR, and assign clear responsibility for interpreting and acting on CGM data.

Clinical Guardrails / Mimics / Pitfalls

Do not use CGM values alone for insulin dosing decisions; always confirm with point-of-care glucose before adjusting therapy. Avoid CGM in patients with hypotension, vasopressor therapy, severe dehydration, edema/anascara, DKA, or known interfering substances (high-dose vitamin C, hydroxyurea). Do not continue CGM during imaging or surgical procedures requiring device removal without a re‑application plan. Ensure hypoglycemia treatment protocols are followed regardless of CGM trends.

Concrete Clinical Example

A 72‑year‑old woman with type 2 diabetes and CKD stage 4 is admitted for pneumonia. She reports a prior episode of severe hypoglycemia requiring assistance. Screening shows no contraindications. Inpatient CGM (Dexcom G6) is initiated with twice‑daily fingerstick point‑of‑care glucose checks. Nursing staff receive training, the patient is educated on responding to alerts, CGM data flow into the EHR, and a nurse is assigned to review glucose trends and alerts each shift.

Source: Management of Individuals With Diabetes at High Risk for Hypoglycemia: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2023, https://doi.org/10.1210/clinem/dgac596