Type 1 Diabetes in Children: Lows, Sick Days and DKA

Pediatrics · Endocrine (Type 1 Diabetes)·Updated 2026-10-28

What it is

Type 1 diabetes is autoimmune destruction of the pancreatic beta cells, which leaves the child with an absolute lack of insulin. Without insulin, glucose cannot enter cells, so the body breaks down fat for fuel and produces ketones. That mechanism explains the core nursing rules: the child always needs basal insulin, even when ill and not eating, and ketones are checked whenever glucose is high or the child is sick.

What the NCLEX focuses on

New-onset signs: polyuria, polydipsia, weight loss despite a good appetite, fatigue, and new bedwetting in a toilet-trained child; many children first present in diabetic ketoacidosis (DKA).
Hypoglycemia signs: shakiness, sweating, pallor, tachycardia, irritability or sudden behavior change; young children cannot reliably describe symptoms.
A conscious child who can swallow receives fast-acting carbohydrate; a child who is unconscious, seizing or unable to swallow receives glucagon, never food or fluid by mouth.
Sick-day rules: continue basal insulin, check glucose every 2 to 3 hours, check ketones when glucose is above 250 mg/dL (13.9 mmol/L) or the child vomits, and give fluids.
Cerebral edema is the most dangerous complication of DKA in children: headache, falling heart rate, rising blood pressure and decreasing level of consciousness during the first hours of treatment.
The honeymoon phase is a temporary fall in insulin need weeks after diagnosis; insulin and monitoring continue.
Recurrent DKA with weight loss in an adolescent suggests deliberate insulin omission; ask privately.

Priority nursing actions

Check glucose at the first sign of a low; if no meter is available, treat as hypoglycemia.
Alert child who can swallow: give 15 g of fast-acting carbohydrate (such as 4 oz [120 mL] of juice), recheck in 15 minutes, repeat if still below 70 mg/dL (3.9 mmol/L), then give a snack or meal.
Unconscious or seizing child: turn to the side, give glucagon as prescribed, and call for emergency help.
In DKA: give isotonic IV fluids and a continuous insulin infusion as prescribed, monitor potassium and cardiac rhythm, and add dextrose as glucose falls while insulin continues.
Perform hourly neurologic checks during DKA treatment; report headache, bradycardia or decreasing responsiveness at once and prepare mannitol or hypertonic saline.

Numbers to know

Value	Target or threshold	Why it matters
Hypoglycemia	Below 70 mg/dL (3.9 mmol/L)	Treat immediately
Fast-acting carbohydrate	15 g, recheck in 15 minutes	Rule of 15 for the alert child who can swallow
Glucagon	0.5 mg below 25 kg; 1 mg at 25 kg or more	Severe hypoglycemia with no safe swallow
Ketone check	Glucose above 250 mg/dL (13.9 mmol/L) or vomiting	Detects early DKA
DKA	Glucose above 200 mg/dL (11.1 mmol/L), venous pH below 7.3, ketones present	Pediatric diagnostic criteria
A1C goal	Below 7% for most children	Individualized target that limits long-term complications

Common exam traps

Choosing juice by mouth for a child who is unresponsive or seizing: wrong because the child cannot protect the airway; give glucagon.
Choosing to skip long-acting insulin when the child is ill and not eating: wrong because illness raises glucose and ketones; basal insulin prevents DKA.
Choosing a cheese stick or crackers as the first treatment for a low: wrong because protein and fat slow absorption; simple sugar comes first.
Choosing a faster IV fluid rate for headache and bradycardia during DKA treatment: wrong because these are signs of cerebral edema; call for help.

What to teach

Carry fast-acting sugar and glucagon at all times; train school staff through the diabetes medical management plan and Section 504 plan.
Match tasks to development: a school-age child can do fingersticks, count simple carbohydrates and dial the pen after an adult confirms the dose; adults keep dose decisions.
Check glucose before and after exercise; activity can cause lows hours later, including overnight.
On sick days, never skip basal insulin; call the team for vomiting, moderate or large ketones, or rapid breathing.

Client handout: Type 1 Diabetes: Your Child at Home and School (nurse guide and printable patient handout).

Try 2 NCLEX-style questions on this topic

From the NCLEXPace question bank. Pick your answers, then check them inside NCLEXPace.

Question 1 · QID 99816A5B

The school nurse is called to a classroom where a 9-year-old with type 1 diabetes (weight 32 kg) is lying on the floor, unresponsive to voice, with jerking movements of both arms. A fingerstick glucose reads 34 mg/dL (1.9 mmol/L). Which action should the nurse take first?

Select the best answer.

A. Give 4 oz (120 mL) of juice by spoon in small amounts while closely monitoring for improvement in responsiveness
B. Apply glucose gel inside the cheek and massage the outside of the cheek to encourage absorption during the seizure
C. Inject glucagon 0.5 mg subcutaneously and monitor for return of consciousness before giving any oral carbohydrate
D. Turn the child on the side and inject glucagon 1 mg IM

Question 2 · QID 0391D7A9

The nurse plans diabetes self-care teaching for a 9-year-old with type 1 diabetes who uses insulin pens. Which tasks are developmentally appropriate for the child to perform? Select all that apply.

A. Calculate a correction dose from the glucose reading without an adult checking it
B. Count the carbohydrates in a simple snack using a food chart
C. Choose and clean a fingertip and operate the lancing device while a parent watches
D. Dial the prescribed dose on the pen after a parent confirms the number
E. Name 3 signs that mean the blood glucose is low
F. Decide on his own to skip an injection when he is not hungry

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Sources

Hockenberry MJ, Duffy EA, Gibbs KD. Wong's Nursing Care of Infants and Children. 12th ed. Elsevier; 2024.
American Diabetes Association Professional Practice Committee. 14. Children and Adolescents: Standards of Care in Diabetes-2025. Diabetes Care. 2025;48(Suppl 1).
Glaser N, Fritsch M, Priyambada L, et al. ISPAD Clinical Practice Consensus Guidelines 2022: Diabetic ketoacidosis and hyperglycemic hyperosmolar state. Pediatr Diabetes. 2022;23(7):835-856.
Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Diabetes.

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