Diabetes Sick Day Plan for Seniors: What Caregivers Need to Know

Why Illness Makes Diabetes Dangerous

When your parent gets sick — a cold, the flu, a urinary tract infection, a stomach bug — their blood sugar rises even if they're eating less than usual. The body's stress response floods the bloodstream with cortisol and adrenaline, which trigger glucose release from the liver. At the same time, illness often disrupts the normal medication and meal schedule. Vomiting prevents oral medication absorption. Reduced appetite leads caregivers to skip insulin doses. Dehydration concentrates blood glucose.

For younger adults, this usually means a few days of elevated readings that resolve when the illness clears. For an older adult with reduced kidney function, cognitive impairment, or a complex medication regimen, it can spiral into diabetic ketoacidosis (DKA) or hyperosmolar hyperglycemic state (HHS) — both medical emergencies with mortality rates that climb with age.

The Sick Day Monitoring Protocol

When your parent is ill, increase blood sugar monitoring to every 2–4 hours, regardless of their usual schedule. You need to catch dangerous trends early, not discover them after the crisis is underway.

Track and log:

• Blood sugar every 2–4 hours
• Temperature twice daily
• Fluid intake (measure it — don't estimate)
• Food intake (even if minimal)
• Urine or blood ketones if blood sugar exceeds 240 mg/dL on two consecutive checks during an acute illness
• All medications given, including any doses held or vomited

Fluid rules: Track fluid intake and follow the physician's sick-day instructions. If your parent cannot retain fluids because of vomiting, seek emergency care.

Never skip insulin on a sick day unless the physician gives specific instructions to do so. Illness raises blood sugar, so your parent usually needs their insulin even if they're not eating. Oral diabetes medications may need to be handled differently during illness — ask the physician for specific instructions before holding or changing them.

SGLT2 Inhibitor Alert

If your parent takes an SGLT2 inhibitor (empagliflozin/Jardiance, dapagliflozin/Farxiga, canagliflozin/Invokana), this medication must be held during acute illness, infection, or any period of reduced oral intake. SGLT2 inhibitors carry a risk of euglycemic diabetic ketoacidosis (eDKA) — ketoacidosis that occurs even with normal or mildly elevated blood sugar. The normal-looking glucose reading masks the metabolic emergency underneath, which means you won't catch it with blood sugar checks alone.

If your parent is on an SGLT2 inhibitor and becomes ill: hold the medication, check ketones, and call the physician.

When to Call the Doctor

Call the physician's office or after-hours line for:

• Blood sugar above 240 mg/dL on two consecutive checks during illness despite following the usual regimen
• Illness with inability to eat normally
• Fever or worsening illness
• Moderate ketones on urine or blood testing
• Ongoing diarrhea or vomiting, especially if it prevents normal fluid intake
• Any new or worsening symptoms (confusion, chest pain, difficulty breathing)

When to Call 911

Don't wait for the doctor's callback if any of these are present:

• Moderate-to-large ketones with rapid breathing, fruity or acetone-smelling breath, severe abdominal pain, or inability to keep fluids down
• Rapid, deep breathing (Kussmaul breathing — the body trying to blow off acid)
• Fruity or acetone-smelling breath
• Severe abdominal pain with nausea or vomiting
• Confusion, extreme drowsiness, or difficulty waking your parent
• Blood sugar below 54 mg/dL that doesn't respond to the Rule of 15 (15 grams of fast-acting carbs, wait 15 minutes, recheck)
• Inability to keep any fluids down
• Loss of consciousness or seizure

Prepare Before the Sick Day Arrives

Sick days come without warning. Prepare a sick day kit now:

• Ketone test strips (check expiration dates — expired strips give false negatives)
• Fast-acting glucose: tablets, gel, juice boxes
• Sugar-free electrolyte drinks (Pedialyte, sugar-free Gatorade)
• Regular (sugar-containing) ginger ale or juice for low blood sugar
• A thermometer
• A written copy of the sick day protocol with the physician's phone number and after-hours line
• Current medication list with dosing instructions and which medications to hold during illness

Post the protocol on the refrigerator. If a hired caregiver or family member is on duty during the illness, they need to follow it without calling you for every decision.

The Caring for a Parent With Diabetes toolkit includes a complete sick day action plan with monitoring schedules, ketone decision trees, and emergency escalation thresholds — ready to print and post.