Hypoglycemia is a blood glucose level below 70 mg/dL (3.9 mmol/L), most often in a person taking insulin or a sulfonylurea. It is not a nursing diagnosis on its own; the nursing diagnoses used most often are Risk for Unstable Blood Glucose Level, Acute Confusion, Ineffective Health Self-Management, and Risk for Adult Falls. The nurse recognizes the signs early, confirms the glucose level, treats it right away by the facility protocol, rechecks, finds the cause, and teaches the client how to prevent the next episode.
At a glance
- What it is
- A blood glucose level too low to fuel the brain and body. The American Diabetes Association (ADA) uses three levels, shown in the table below.
- Main causes
- Too much insulin or sulfonylurea, a missed or delayed meal, more exercise than usual, alcohol without food, kidney or liver disease, and changes in medicines or illness.
- Key signs
- Shakiness, sweating, fast heartbeat, hunger, and anxiety; then confusion, slurred speech, unusual behaviour, seizures, or loss of consciousness.
- Nursing focus
- Check the glucose, treat promptly by protocol, recheck, prevent a repeat low, find the cause, and teach prevention.
- Act now
- Any client who cannot swallow safely, is unresponsive, or is having a seizure: nothing by mouth, call for help, and give glucagon or IV dextrose as ordered.
Why hypoglycemia happens
The brain runs almost entirely on glucose and cannot store much of it. When blood glucose falls, the body first stops releasing insulin, then releases glucagon and epinephrine, which tell the liver to release stored glucose. Epinephrine also causes the early warning signs: shakiness, sweating, a fast heartbeat, hunger, and anxiety. These are called autonomic (or adrenergic) symptoms.
If glucose keeps falling, the brain does not get enough fuel. This causes neuroglycopenic symptoms: confusion, trouble concentrating, slurred speech, blurred vision, odd behaviour, seizures, and coma. Severe or prolonged hypoglycemia can cause brain injury, heart rhythm problems, falls, and death.
In diabetes, the usual cause is a mismatch between medicine, food, and activity. Insulin and sulfonylureas (such as glipizide or glyburide) lower glucose whether or not the person has eaten. Kidney disease slows the clearance of insulin and some sulfonylureas, so their effect lasts longer. Alcohol blocks the liver from making new glucose, which can cause lows hours later, often overnight. Beta-blockers can hide the fast heartbeat and tremor, although sweating usually still occurs.
People who have had diabetes for many years, or who have frequent lows, may lose the early warning signs. This is called hypoglycemia unawareness. Their first sign may be confusion, which makes it harder for them to treat themselves.
Levels of hypoglycemia (ADA)
| Level | Blood glucose | What it means |
|---|---|---|
| Level 1 | Below 70 mg/dL (3.9 mmol/L) and at or above 54 mg/dL (3.0 mmol/L) | Alert value. Treat with fast-acting carbohydrate and look at the cause. |
| Level 2 | Below 54 mg/dL (3.0 mmol/L) | Clinically significant. Treat right away; the regimen needs review. |
| Level 3 | No set number | Severe: altered mental or physical function and the person needs help from someone else to recover. |
Nursing assessment
Subjective data
- Shakiness, sweating, pounding heart, hunger, anxiety, tingling around the mouth
- Headache, weakness, dizziness, blurred or double vision, trouble thinking
- Timing of the last meal, how much was eaten, and any nausea or vomiting
- Diabetes medicines: names, doses, timing, and any recent change
- Recent exercise, alcohol use, illness, or weight loss
- Night sweats, nightmares, or morning headache, which can point to lows during sleep
- Whether the client can tell when their glucose is low, and how they usually treat it
Objective data
- Point-of-care blood glucose or continuous glucose monitor reading, confirmed by fingerstick or lab glucose as the facility requires
- Level of consciousness, orientation, speech, behaviour, and ability to swallow safely
- Cool, clammy, pale skin; tremor; tachycardia
- Seizure activity or unresponsiveness
- Recent intake, NPO status, tube feeding or parenteral nutrition interruptions
- Kidney and liver function, and the medication administration record for insulin and sulfonylurea timing
- Fall risk, especially in older adults and at night
Hypoglycemia vs. hyperglycemia
| Feature | Hypoglycemia | Hyperglycemia |
|---|---|---|
| Onset | Fast — minutes | Slow — hours to days |
| Skin | Cool, clammy, sweaty | Warm, dry, flushed |
| Thirst and urine | Usually normal | Increased thirst and urine output |
| Behaviour | Shaky, anxious, irritable, confused | Tired, drowsy, weak |
| Breath | Normal | Fruity odour and deep breathing if ketoacidosis develops |
| If unsure and no meter | Treat as hypoglycemia. A small amount of glucose will not harm a client who is high, but an untreated low can cause brain injury. | |
Nursing diagnoses used with hypoglycemia
- Risk for Unstable Blood Glucose Level — insulin or sulfonylurea use, poor intake, illness, or kidney disease
- Acute Confusion — the brain is short of glucose during a low
- Ineffective Health Self-Management — difficulty matching medicines, meals, and activity at home
- Risk for Adult Falls — dizziness, weakness, and confusion, especially at night
- Risk for Injury and Risk for Aspiration — during a seizure or if something is given by mouth to a client who cannot swallow safely
- Fear — fear of lows, especially after a severe or overnight episode
Worked care plans
Four plans in the same ADPIE shape. The scenario is a 72-year-old woman with type 2 diabetes who takes basal insulin and glipizide at home. She was admitted two days ago with pneumonia and has eaten very little since. Her kidney function is lower than her baseline. At 0630 the nurse finds her sweaty and confused, and her point-of-care blood glucose is 48 mg/dL. She is drowsy but follows commands and can swallow safely.
1. Acute Confusion
Problem-focusedSubjective: “Why am I here? I need to get the kids to school.” Says she feels “shaky and strange.”
Objective: Point-of-care glucose 48 mg/dL. Oriented to person only. Slurred speech, cool and clammy skin, fine tremor, heart rate above her baseline. Follows simple commands; swallow intact. Received her scheduled glipizide yesterday morning and her basal insulin last night, but ate less than a quarter of her meals.
Acute Confusion related to inadequate glucose supply to the brain, as evidenced by disorientation to time and place, slurred speech, and a blood glucose of 48 mg/dL.
- Blood glucose returns to at least 70 mg/dL, then into the target range the provider orders
- Client is oriented to her baseline level within the hour
- Client stays free of injury and aspiration during the episode
- Stay with the client and call for help; keep the bed low and side rails per policy
- Confirm she can swallow safely, then give fast-acting glucose by mouth in the amount the facility protocol states
- Recheck blood glucose 15 minutes after treatment and repeat treatment if it is still below 70 mg/dL
- If she becomes unable to swallow or unresponsive, give nothing by mouth, turn her on her side, and give glucagon or IV dextrose as ordered
- Once glucose is above 70 mg/dL, give a meal or snack with carbohydrate and protein to prevent another drop
- Reassess orientation, speech, and vital signs after each recheck
- Notify the provider, report the glipizide and insulin timing, and ask for the regimen to be reviewed
The first 15-minute recheck was 66 mg/dL; after a second treatment it was 94 mg/dL. She ate breakfast and was oriented to person, place, and time within 40 minutes. Goal met; continue close glucose monitoring because glipizide can cause the low to return.
2. Risk for Unstable Blood Glucose Level
Risk diagnosis- Insulin together with a sulfonylurea
- Poor oral intake during acute illness
- Reduced kidney function, which prolongs the effect of insulin and glipizide
- Older age
- Infection and illness, which can swing glucose either way
No “as evidenced by” — this names a problem that has not happened yet.
Risk for Unstable Blood Glucose Level related to combined insulin and sulfonylurea therapy, inadequate dietary intake, reduced kidney function, and acute infection.
- No further glucose below 70 mg/dL during the hospital stay
- Glucose stays within the target range the provider orders
- Insulin doses are timed with meals and adjusted to intake
- Check blood glucose at the times ordered (before meals and at bedtime, and overnight after a low) and whenever symptoms appear
- When intake is poor or the client is NPO, check with the provider before giving the sulfonylurea or insulin, and follow the hypoglycemia and insulin-hold policy
- Give mealtime insulin when the meal tray is present and the client is able to eat, per order
- Record the percentage of each meal eaten and report poor intake
- Watch kidney function results and tell the provider about changes
- Keep fast-acting glucose at the bedside or on the unit per policy
The provider stopped glipizide and reduced the basal insulin. Over the next 48 hours, all readings stayed within her ordered target with no lows. Risk not realised; continue plan.
3. Ineffective Health Self-Management
Problem-focusedSubjective: “When I’m not hungry I just skip lunch, but I always take my pills.” “Last month I got shaky twice, so I ate a chocolate bar.” Drinks two glasses of wine most evenings, often without dinner.
Objective: Does not carry glucose tablets. Checks her glucose “now and then.” No medical ID. Lives alone.
Ineffective Health Self-Management related to inadequate knowledge of how medicines, meals, and alcohol affect blood glucose, as evidenced by skipping meals after taking glucose-lowering medicine, treating lows with chocolate, and irregular glucose monitoring.
- Client states the signs of a low and the 15-15 rule before discharge
- Client shows how to check her glucose correctly
- Client describes a plan for meals, alcohol, and sick days
- Client carries fast-acting glucose and wears medical ID
- Ask what she already knows and what gets in the way at home
- Teach the signs of a low and the 15-15 rule, using teach-back
- Explain why chocolate and other fatty foods work slowly for a low
- Explain that alcohol can cause a delayed low, and that it should be taken with food
- Have her demonstrate glucose checks and record readings
- Refer to a diabetes educator and dietitian; involve family or a neighbour if she agrees
- Give written material in large print and plain language
She correctly explained the 15-15 rule and showed a correct glucose check. Her daughter will bring glucose tablets and order a medical ID. She is still unsure about limiting wine. Goal partially met; diabetes educator follow-up arranged.
4. Risk for Adult Falls
Risk diagnosis- Recent hypoglycemia with confusion
- Age over 65
- Weakness from pneumonia
- Getting up at night to use the toilet
- Unfamiliar hospital surroundings
No “as evidenced by” — this names a problem that has not happened yet.
Risk for Adult Falls related to episodes of hypoglycemia with confusion, age over 65, generalized weakness, nighttime toileting, and an unfamiliar environment.
- No falls during the hospital stay
- Client calls for help before getting up
- Complete the facility fall-risk assessment and apply its precautions
- Keep the bed low, the call light and a urinal or commode in reach, and a night light on
- Offer toileting on a schedule, including before sleep
- Check glucose if she becomes shaky, sweaty, dizzy, or confused before helping her up
- Have her sit at the edge of the bed before standing, and use non-slip footwear
No falls. She used the call light at night on both nights and waited for help. Risk not realised; continue plan.
Free download
NCLEX Readiness Diagnostic
Fifty questions with a written rationale on every option, scored by section so you can see which content area is weakest. Sent as a PDF.
Interventions and rationales
Client and family teaching
- Know your own signs of a low: shaky, sweaty, hungry, fast heartbeat, confused, or irritable
- If you feel low, check your glucose. If it is below 70 mg/dL, take 15–20 g of fast-acting sugar, wait 15 minutes, and check again
- Examples of about 15 g: glucose tablets (check the label for how many), half a cup of juice or regular soda, or one tablespoon of sugar or honey
- Once you are back above 70 mg/dL, eat a meal or snack if your next meal is more than an hour away
- Always carry glucose tablets or gel, and wear a medical ID
- Teach a family member when and how to use your glucagon (nasal or injection) and to call 911 if you are unresponsive or do not improve
- Do not skip or delay meals after taking insulin or a sulfonylurea
- If you drink alcohol, have it with food, and check your glucose at bedtime; lows can happen hours later
- Check your glucose before and after exercise and before driving; do not drive while low
- If you use a continuous glucose monitor, keep low alerts turned on
- Tell your provider about every low, especially lows at night or ones you did not feel
NurseStudyPrep.com
You’ve read the care plan. Now answer one.
A safety item in the NCLEX format. On Prep, every option gets a written rationale — including the three that are wrong.
A client with type 1 diabetes is found unresponsive in bed. The point-of-care blood glucose is 38 mg/dL, and the client has no IV access. Which action by the nurse is most appropriate?
Why B. An unresponsive client cannot protect their airway, so nothing goes by mouth — juice and glucose gel can both be aspirated. Glucagon works without IV access, and the side-lying position protects the airway if it causes vomiting. Waiting 15 minutes leaves a severe low untreated. Prep also explains why each wrong option looks reasonable.
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Frequently asked questions
What is the nursing diagnosis for hypoglycemia?
Hypoglycemia is a medical finding, so it goes in the “related to” part. Common nursing diagnoses are Risk for Unstable Blood Glucose Level, Acute Confusion, Ineffective Health Self-Management, Risk for Adult Falls, and Risk for Injury.
What blood sugar level is hypoglycemia?
The ADA defines hypoglycemia as a blood glucose below 70 mg/dL (3.9 mmol/L). Below 54 mg/dL (3.0 mmol/L) is Level 2, and any low that needs another person’s help to treat is Level 3 (severe).
What is the 15-15 rule?
Give 15 g of fast-acting carbohydrate, wait 15 minutes, and recheck. Repeat if glucose is still below 70 mg/dL, then give a meal or snack. The ADA suggests 15–20 g; follow your facility protocol.
What is the priority nursing action for a client with hypoglycemia?
Treat the low right away. If the client can swallow safely, give fast-acting carbohydrate by mouth. If not, protect the airway, give nothing by mouth, and give glucagon or IV dextrose as ordered.
Why can hypoglycemia come back after it is treated?
Sulfonylureas and long-acting insulin keep lowering glucose for hours, and kidney disease makes their effect last longer. That is why the client needs a meal or snack and more frequent glucose checks afterwards.
What is hypoglycemia unawareness?
Loss of the early warning signs of a low, such as shakiness and sweating. It is more common with long-standing diabetes and frequent lows. The first sign may be confusion, so regular glucose checks and CGM alerts are important.
References
- Herdman, T. H., Kamitsuru, S., & Lopes, C. T. (Eds.). NANDA International Nursing Diagnoses: Definitions and Classification, 2024–2026. Thieme.
- American Diabetes Association Professional Practice Committee. Standards of Care in Diabetes—2026. Diabetes Care, 49(Supplement 1).
- International Hypoglycaemia Study Group. Glucose concentrations of less than 3.0 mmol/L (54 mg/dL) should be reported in clinical trials. Diabetes Care, 2017;40(1):155–157.
- Seaquist, E. R., et al. Hypoglycemia and diabetes: a report of a workgroup of the American Diabetes Association and the Endocrine Society. Diabetes Care, 2013;36(5):1384–1395.
- Harding, M. M., Kwong, J., & Hagler, D. Lewis’s Medical-Surgical Nursing: Assessment and Management of Clinical Problems, 12th ed. Elsevier, 2023.
- Ignatavicius, D. D., Rebar, C. R., & Heimgartner, N. M. Medical-Surgical Nursing: Concepts for Clinical Judgment and Collaborative Care, 11th ed. Elsevier, 2024.
Glucose thresholds for treatment, carbohydrate amounts, recheck times, glucagon and IV dextrose products and doses, inpatient glucose targets, and monitoring schedules vary by client, by provider, and by facility. Follow the provider’s written orders and your own institution’s hypoglycemia protocol. This page supports study and does not replace course instruction or clinical judgement.
