Diabetes and glycemic emergencies
NCLEX map for hypo vs hyper, DKA vs HHS, sick-day rules, and the first actions that keep the airway and brain safe.
By the Clesial Editorial Team · Reviewed by Clesial Editorial Team, Clinical Content Review
Updated August 4, 2026 · 10 min read
Glycemic items turn on one decision: is the brain getting glucose right now, or is the client drowning in sugar and acid? Name that first, then pick the sequence.
Hypoglycemia vs hyperglycemia
| Low glucose | High glucose | |
|---|---|---|
| Picture | Brain starving | Osmotic diuresis / dehydration |
| Cues | Shake, sweat, hunger, confusion, seizure risk | Polyuria, polydipsia, polyphagia, blurred vision, fatigue |
| First move | Fast carbs if alert; glucagon/IV dextrose if not | Fluids as ordered; treat the driver (illness, missed insulin) |
- If the client is unresponsive, do not force oral sugar — airway and parenteral rescue first.
- After a hypo is corrected, follow with a snack that holds the glucose (protein + complex carb) unless the next meal is imminent.
DKA vs HHS
Both are volume emergencies. DKA adds acid and ketones; HHS adds extreme dehydration.
| DKA | HHS | |
|---|---|---|
| Typical client | Type 1 / absolute insulin lack | Type 2 / extreme relative lack |
| Labs picture | Ketones + anion-gap metabolic acidosis | Very high glucose, high osmolality, little/no ketosis |
| Breathing / neuro | Kussmaul, fruity breath, can progress to coma | Profound dehydration, altered mental status |
| Priority sequence | IV fluids → insulin drip → replace K as ordered | Aggressive fluids → careful insulin/glucose correction |
Safety
Insulin drives potassium into cells. Expect potassium to fall as DKA treatment starts — monitor and replace per protocol before and during the drip.
Insulin timing (exam level)
You do not need every brand name. You need which class peaks when, because peak = hypo risk and meal timing.
| Class | When it matters | Teaching cue |
|---|---|---|
| Rapid (aspart, lispro) | Meal is ready or coming immediately | Highest early hypo risk if food is delayed |
| Short (regular) | Onset slower than rapid; IV regular used in DKA protocols | Still time food to the onset/peak |
| Intermediate (NPH) | Cloudy; often mixed or BID basal-ish coverage | Peak mid-span — snacks may be planned |
| Long (glargine, detemir) | Basal background; usually no pronounced peak | Do not mix glargine with other insulins in one syringe |
Mixing (when ordered)
- Clear before cloudy when drawing (rapid/regular, then NPH).
- Do not mix long-acting glargine into the same syringe.
- Verify dose with a second nurse when policy requires it for insulin.
Sick-day rules
- Keep taking basal insulin unless the provider says otherwise — illness raises glucose.
- Check glucose (and ketones when taught) more often; hydrate.
- Call for persistent vomiting, ketones, or glucose that will not come down — that is DKA risk, not a wait-it-out day.
How to reason under time pressure
- Is the client hypo right now? If yes, treat glucose delivery first.
- If hyper with illness: fluids and the DKA/HHS fork (ketones/acidosis vs extreme dehydration).
- Match insulin action to food and peak risk; never push oral carbs into an unprotected airway.
Must know
- Treat hypoglycemia now if the client can swallow: fast carbs, then a protein/complex carb snack when stable. If not alert: glucagon or IV dextrose per protocol.
- DKA: type 1 pattern, ketones, anion-gap acidosis, Kussmaul breathing — fluids first, then insulin drip, watch potassium.
- HHS: type 2 pattern, extreme hyperglycemia, profound dehydration, little or no ketosis — fluids and gradual glucose correction.
- Never skip basal insulin teaching for type 1 on sick days; check glucose and ketones more often.
- Peak = highest hypo risk. Know rapid vs short vs intermediate vs long timing at a high level.
- Do not give insulin when glucose is critically low — treat the hypo first.
Memory hooks
- Cold and clammy → need some candy: Hypoglycemia: shakiness, sweat, hunger, confusion. Give fast sugar if they can take PO safely.
- DKA = Dehydration, Ketones, Acidosis: Fluids, insulin, and potassium management travel together. HHS is dehydration and extreme sugar without the same ketone/acidosis picture.
How it's tested
Stems pair a glucose number with neuro change, vomiting, or Kussmaul breathing and ask for the first action. Distractors start insulin before fluids in DKA, give oral carbs to an unresponsive client, or hold all insulin on sick days.