Glucose

Exam stems hinge on recognizing symptomatic hypoglycemia and treating before retesting — tremor, confusion, diaphoresis, and tachycardia point to lows, and the answer is treat the conscious patient first, recheck later, never “draw a confirming lab” or “notify the provider” as the initial action. A classic trap pairs steroid, TPN, or enteral-feed patients with rising sugars; the tell is that stopping TPN abruptly or giving insulin without food can swing them low (rebound hypoglycemia — the classic teaching, though often mild in stable patients). On beta-blockers the adrenergic clues (tremor, palpitations, tachycardia) are blunted, so neuroglycopenic confusion — or diaphoresis, which is cholinergic and not masked — may be the only warning.

Don’t confuse this term with its relatives: laboratory flags critical values for notification (commonly glucose <40 or >500 mg/dL, though limits are institution-set), while a symptomatic glucose demands immediate treatment. Monitoring stresses trending against baseline — so recheck after every correction and watch for rebound. Memory hook: “cold and clammy, give them candy; hot and dry, sugar’s high.”