👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: low blood sugar · low glucose · insulin reaction
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Use this quick-reference guide to spot, treat, and prevent Hypoglycemia on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
🩺 Signs
Shaky, sweaty, tachycardic
Confusion, irritable, slurred
Seizure, coma if severe
✅ Do
Rule of 15: 15g carb, recheck 15min
4 oz juice, glucose tabs
Repeat ×3 then protein snack
📌 Unconscious
IV D50 if IV access
Glucagon IM/SubQ if no IV
NPO if can't swallow
⚠️ Causes
Too much insulin, skipped meal
Excess exercise, alcohol
📚 Hypoglycemia — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Hypoglycemia is a blood glucose below 70 mg/dL. The brain depends on glucose, so symptoms come on fast and are an emergency. Causes include too much insulin, skipped meals, and excess exercise. Remember 'cold and clammy, need some candy.'
Neuroglycopenic: confusion, slurred speech, blurred vision, seizures, coma
Onset is rapid (vs the gradual onset of hyperglycemia)
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Nursing priorities
What to do, in order
If conscious: give 15 g fast-acting carbohydrate (4 oz juice, glucose tabs), recheck in 15 min
Repeat the 15/15 rule until glucose > 70, then give a complex carb + protein snack
If unconscious or NPO: IV dextrose 50% (D50) or IM/SubQ glucagon
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Red flags — report now
Escalate immediately
Unconscious, seizing, or unable to swallow — do NOT give oral food/fluids; use IV D50 or glucagon
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Labs & values
Numbers to know
Blood glucose < 70 mg/dL
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Patient teaching
What patients must know
Always carry a fast sugar source; treat early symptoms immediately
Recognize that beta blockers can mask the early shaky/tachycardic warning signs
❓ Hypoglycemia: NCLEX FAQs
What are the priority nursing interventions for Hypoglycemia?
If conscious: give 15 g fast-acting carbohydrate (4 oz juice, glucose tabs), recheck in 15 min. Repeat the 15/15 rule until glucose > 70, then give a complex carb + protein snack. If unconscious or NPO: IV dextrose 50% (D50) or IM/SubQ glucagon.
What are the warning signs of Hypoglycemia a nurse must report?
Unconscious, seizing, or unable to swallow — do NOT give oral food/fluids; use IV D50 or glucagon.
What do I need to know about Hypoglycemia for the NCLEX?
Adrenergic: shakiness, diaphoresis, tachycardia, hunger, anxiety. Neuroglycopenic: confusion, slurred speech, blurred vision, seizures, coma. Onset is rapid (vs the gradual onset of hyperglycemia).
What patient teaching is important for Hypoglycemia?
Always carry a fast sugar source; treat early symptoms immediately. Recognize that beta blockers can mask the early shaky/tachycardic warning signs.