Type 1 Diabetes Daily Management & Insulin Tracking

ContextThe gap between calculated dose and actual dose administered — and the post-meal glucose response — is the primary data used to calibrate insulin-to-carb ratios over time. Logging both the calculation and the actual administration captures any intentional adjustments (e.g., pre-bolusing by 15 minutes, reducing dose for anticipated exercise) that affect the outcome.

ContextPre-bolusing — giving rapid-acting insulin 10–20 minutes before eating — significantly improves post-meal glucose control by matching insulin peak to carbohydrate absorption peak. Log the pre-bolus interval you used (e.g., '15 minutes before') alongside pre-meal glucose so you can identify which interval produces the best post-meal response for your specific insulin.

ContextThe 2-hour post-meal reading paired with the pre-meal reading and carbohydrate count is the primary data for evaluating insulin-to-carb ratio accuracy. A consistent 2-hour reading above target despite accurate carb counting suggests your I:C ratio needs strengthening for that meal. Log at the same interval consistently — mixing 1-hour and 3-hour post-meal checks makes comparison unreliable.

ContextThe correction factor (also called insulin sensitivity factor or ISF) is the number of mg/dL one unit of insulin lowers your glucose. It varies by time of day and requires calibration based on correction bolus outcomes. Logging pre-correction glucose, correction dose, and the glucose 2–3 hours later (when the correction has fully acted) provides the data to evaluate and adjust your ISF.

ContextIncomplete carbohydrate logging is the most common source of unexplained glucose variability. Log everything: the half-cup of juice that wasn't covered, the handful of crackers, the glucose tablets. The only way to identify whether your I:C ratios are correct is to ensure all carbohydrates are accounted for in the record.

ContextFat and protein significantly slow gastric emptying and produce a delayed glucose rise 2–4 hours after a meal — most pronounced with pizza, pasta with cream sauce, burgers, steak, or any large meal with significant fat content. A standard upfront bolus that produces a good 2-hour reading may result in a 3–5 hour glucose spike as digestion-slowed carbohydrates finally absorb. Pump users can use an extended bolus (dual-wave or combo): typically 40–60% delivered upfront and the remainder extended over 2–3 hours. Injection users can split the bolus or plan a small correction at 2 hours. Log which meal types consistently trigger the delayed rise pattern so you can build meal-specific bolus strategies over time.

ContextAlcohol inhibits hepatic glucose production — the liver's emergency glucose release mechanism — for approximately 8–12 hours after consumption. When sober, a hypoglycemic episode typically triggers the liver to release stored glucose, providing a partial self-correction. With alcohol on board, this mechanism is blocked: a hypoglycemic episode after drinking will not self-correct without treatment, and the symptoms of hypoglycemia (confusion, incoordination) can be indistinguishable from intoxication. Always eat carbohydrates with alcohol, set CGM low alert thresholds higher than your usual nighttime setting, ensure someone with you knows about your T1D and glucagon location, and avoid situations where you would be alone overnight and unable to self-treat.

ContextInsulin absorption is affected by injection and infusion site issues in ways that are invisible at the time. An infusion site that bled at insertion often absorbs insulin poorly for that session. Lipohypertrophy (hardened tissue from repeated injection in the same site) causes unpredictable absorption. Log any site issues and rotate sites systematically — document which site was used at each insertion.

ContextTime-in-range (TIR) is now the primary metric for T1D glucose management — more clinically informative than HbA1c alone because it captures variability and hypoglycemia exposure, not just average glucose. Log daily TIR and note which part of the day drove most time above or below range.

ContextCategorize high alerts by likely cause: missed bolus, underestimated carbs, site failure, illness, stress, or unexplained. Pattern analysis of high alert causes over 1–2 weeks identifies the most productive targets for adjustment — whether that is I:C ratio, basal rate, or infusion site rotation.

ContextHypoglycemia log entries should include: glucose value at detection, whether CGM or symptoms first alerted you, symptoms present (or absent — hypoglycemia unawareness), treatment used, and glucose 15 minutes post-treatment. The 15-minute recheck confirms treatment adequacy. Recurrent lows at the same time of day are a basal rate or I:C ratio signal.

ContextSome CGM sensors require twice-daily fingerstick calibration for accuracy. Missed calibrations cause drift that produces false alerts and misleading trend data. If your device requires calibration, log calibration time and value — missed calibrations often explain otherwise confusing CGM data.

ContextInserting a new CGM sensor during a glucose excursion or immediately before a meal produces unreliable warm-up readings. Plan sensor changes for a fasted, stable period. Log insertion date so you know when the next change is due — running sensors past expiration produces degrading accuracy.

ContextInfusion site rotation is critical for consistent insulin absorption. Document which site was used at each change and rotate systematically. Sites should be changed every 2–3 days maximum — leaving sites in longer increases occlusion risk and absorption variability. A lipohypertrophy map of your common sites is a useful tool to discuss with your diabetes educator.

ContextRunning out of insulin in a reservoir overnight is a preventable DKA risk. Log reservoir level at every site change and estimate days of insulin remaining based on your average daily dose. Fill with sufficient buffer — do not refill only when the low reservoir alarm sounds.

ContextYour pump's TDD data tells you whether your actual insulin delivery matches your programmed doses. Consistently higher TDD than your basal program suggests you are correcting frequently — a signal of inadequate basal or I:C ratios. Consistently lower TDD may indicate meal skipping or under-bolusing. Bring 7-day TDD averages to endo appointments.

ContextOcclusion alerts require immediate site change and ketone check — an occluded infusion set delivers no insulin while the body continues to produce ketones. Auto-mode suspension events in closed-loop systems (e.g., Tandem Control-IQ, Omnipod 5) often indicate a CGM data gap or glucose value outside the automated system's adjustment range — log and investigate the cause.

ContextThe 15-15 rule: 15 grams of fast-acting carbohydrates for a glucose under 70 mg/dL, recheck in 15 minutes. Glucose tablets are preferred over food because the dose is precise and the response is predictable. Log your supply and restock proactively — discovering an empty glucose tablet tube during a hypoglycemic episode is a preventable emergency.

ContextSevere hypoglycemia (unconscious, unable to swallow, or having a seizure) requires glucagon — oral glucose cannot be given safely. Nasal glucagon (Baqsimi) requires no reconstitution and can be administered without training. Confirm expiration date at every monthly review and replace before expiration. Verify household members know its location and have watched the administration instructions.

ContextHypoglycemia pattern analysis is one of the highest-value activities in T1D management. Recurrent lows at the same time of day, recurrent lows after specific activities, or lows occurring with no identifiable cause are all signals for basal or I:C ratio adjustment. The recovery glucose at 15 minutes confirms treatment adequacy — a value still under 70 mg/dL requires a second treatment.

ContextHypoglycemia unawareness — the loss of symptomatic warning before significant lows — develops in some people with long-duration T1D and is a serious safety risk. If you are regularly discovering lows via CGM without symptomatic warning, report this to your endocrinologist. Structured programs to restore hypoglycemia awareness (BGAT, HypoCOMPaSS) are available and effective.

ContextPre-bed assessment significantly reduces overnight hypoglycemia risk. If bedtime glucose is under 90 mg/dL with a downward trend, or if you exercised in the past 4 hours, consider a small bedtime snack with minimal or no insulin. Your endo or diabetes educator can help you develop a specific pre-bed decision tree based on your individual patterns.

ContextExercise type significantly determines glucose response: aerobic exercise (running, cycling, swimming) typically lowers glucose and requires dose reduction; anaerobic exercise (weightlifting, HIIT, sprinting) often initially raises glucose due to adrenaline release before a delayed lowering effect. Log the type precisely — the same duration of 'exercise' can require opposite glucose management strategies.

ContextExercise with elevated glucose and ketones present can rapidly worsen DKA. If pre-exercise glucose is above 250 mg/dL, check blood ketones: above 0.6 mmol/L, postpone exercise, correct with insulin, and recheck before proceeding. Do not exercise through a high glucose if ketones are elevated.

ContextCommon aerobic exercise adjustments: reduce bolus for the meal 1–2 hours before aerobic exercise by 25–75%; set a reduced temp basal rate (50–80% reduction) starting 60–90 minutes before aerobic exercise. These are starting points — individual response varies significantly and requires personal calibration through documented trial.

ContextGlucose can drop rapidly during sustained aerobic exercise. Log at 30-minute intervals and treat if below 90 mg/dL with 15–20 grams of fast-acting carbohydrates to prevent a low during activity. CGM alarms set to alert at 90 mg/dL (rather than the standard 70 mg/dL) during exercise provide earlier warning.

ContextExercise increases muscle glucose uptake for 24–48 hours post-activity. The 2-hour and 4-hour post-exercise readings capture the most active portion of this sensitivity window. Recurrent post-exercise lows at the same interval suggest basal rate or post-exercise meal bolus reduction is needed. Delayed-onset post-exercise hypoglycemia (overnight after afternoon exercise) is common and traceable.

ContextDiabetic ketoacidosis in T1D can develop within hours when insulin delivery is interrupted or insufficient during illness. Sick days require more frequent glucose and ketone monitoring, not less. Even mild illness (a cold, minor infection) increases insulin resistance significantly and requires proactive dose increases that your sick day protocol should specify.

ContextEvery person with T1D should have a written sick day protocol from their endocrinologist specifying: glucose and ketone check frequency during illness, rules for increasing basal rate or correction doses, fluid and nutrition guidance when not eating, and thresholds requiring emergency care. If you do not have a written sick day protocol, request one at your next appointment.

ContextDKA symptoms with blood ketones above 3.0 mmol/L or urine ketones of large/moderate require emergency care. Do not wait for your endo's office to open. DKA is a life-threatening emergency — the threshold for emergency care is lower, not higher, than for other illnesses.

ContextPump failure without a backup injection plan is a DKA risk. Every pump user should have: a backup insulin pen or syringe supply, knowledge of equivalent injection doses for their programmed basal and bolus rates, and an unexpired backup vial of rapid-acting insulin stored correctly. Review and restock quarterly.

ContextMedical alert identification — bracelet, necklace, or wallet card — communicates your T1D and insulin use to emergency responders who may encounter you unconscious or confused from severe hypoglycemia, before you can speak for yourself. The identification should state at minimum: 'Type 1 Diabetes / Insulin Dependent.' Some people also include their glucagon kit location or note it in their phone's emergency medical ID. The American Medical ID and similar providers offer durable, waterproof engraved options. This is a one-time setup step that provides permanent emergency value regardless of how well-controlled your diabetes is at any given time.

ContextThe people who are with you most — partner, roommate, parent, close coworker — are your first response line in a severe hypoglycemic emergency. They need to know: where glucagon is stored, that nasal glucagon (Baqsimi) requires a single squeeze in one nostril and no training, that 911 should be called after administering glucagon even if you appear to recover, and how to distinguish severe hypoglycemia (rapid onset, confusion, seizure, unresponsiveness) from DKA (slower onset with nausea, fruity breath, and excessive thirst). Review this annually and any time someone new becomes a regular presence in your home or daily life.

ContextEmergency responders are trained to check the medical ID accessible from a phone's lock screen without a passcode. On iOS, configure Medical ID in the Health app (accessible via Emergency on the lock screen). On Android, Emergency Information is in Settings. Include: Type 1 Diabetes diagnosis, rapid-acting and basal insulin names and doses, CGM and pump models if applicable, drug allergies, and at least two emergency contact names and phone numbers. Update immediately after any medication or device change.

ContextHbA1c reflects average glucose over approximately 3 months. The standard T1D target is below 7.0% for most adults — confirm your individualized target with your endo, as targets vary based on hypoglycemia risk, age, and complication status. Log alongside your average TIR for the same period — the combination of HbA1c and TIR provides a far more complete picture than either metric alone.

ContextMost CGM apps generate an Ambulatory Glucose Profile (AGP) report. The AGP shows: percentage of time in each glucose range, glucose variability, and typical daily glucose patterns. Print or download this report before every endo appointment — it is the most efficient way to communicate your glucose management profile in a short appointment window.

ContextT1D significantly increases risk for: diabetic nephropathy (kidney disease — tracked via eGFR and microalbumin), cardiovascular disease (tracked via lipid panel), and autoimmune thyroid disease and celiac disease (both more common in T1D due to shared autoimmune mechanism). These should be checked annually — track results and trends over years, not just individual values.

ContextDiabetic retinopathy is the leading cause of preventable blindness in working-age adults and develops without symptoms until advanced. Annual dilated eye exams detect early changes when intervention is most effective. Log exam date, provider, and any findings. Do not skip this appointment if glucose control has been poor — early detection is most important precisely then.

ContextPeripheral neuropathy and peripheral artery disease increase foot complication risk in T1D even at younger ages than Type 2 due to longer disease duration. Annual professional foot examination supplemented by daily self-inspection is standard of care. Log any findings of reduced sensation, skin breakdown, or circulation changes.

ContextThe AGP report is the most efficient communication tool between a T1D patient and their endocrinologist. It shows glucose patterns, variability, and time-in-range in a standardized format that trained endocrinologists can interpret in 2 minutes. Bringing it printed means your appointment addresses patterns rather than spending time describing what your glucose 'usually does.'

ContextMost T1D patients have 2–4 different I:C ratios and ISFs for different times of day. Knowing which periods are well-controlled and which need adjustment before your appointment allows you to use the appointment for specific ratio calibration rather than general assessment.

ContextRecurrent hypoglycemia — even mild — is a clinical priority because it erodes hypoglycemia awareness over time and increases severe hypoglycemia risk. Bringing a structured low log rather than a verbal estimate of 'I've had some lows' gives your endo the specificity needed to make targeted adjustments.

ContextDiabetes distress — the emotional burden of continuous disease management — affects a significant majority of people with T1D at some point and directly worsens clinical outcomes. It is frequently not raised in appointments because patients don't consider it a 'medical' concern. It is. Name it if it is present.

ContextWeekly TIR trend is the most actionable metric in T1D self-management. A declining weekly TIR indicates a pattern requiring investigation — illness, change in diet or activity, sensor accuracy issues, or infusion site problems. An improving TIR confirms that a recent adjustment is working.

ContextFocusing adjustment efforts on the single worst-performing time period is more effective than broadly adjusting all ratios simultaneously. Identify it weekly and bring one or two targeted adjustment questions to your next endo appointment.

ContextT1D supply shortages create immediate safety risks. Review weekly and order with sufficient lead time. Keep minimum backup supplies: one unopened box of sensors, two infusion set changes, one full backup vial of each insulin type. Insurance reorder windows and supply chain delays make proactive ordering essential.