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Diabetes Mellitus is one of the most frequently tested topics on the NCLEX-RN Exam. Questions commonly focus on insulin administration, blood glucose monitoring, diabetic complications, nursing interventions, patient education, medication management, and emergency care.
NCLEX questions often require candidates to identify priority interventions, recognize signs and symptoms, and apply clinical judgment to diabetic patient scenarios.
Diabetes Mellitus is a chronic metabolic disorder characterized by elevated blood glucose levels resulting from insufficient insulin production, ineffective insulin utilization, or both.
Insulin is a hormone produced by the pancreas that helps glucose enter body cells for energy.
When insulin is absent or ineffective, glucose remains in the bloodstream, causing hyperglycemia.
| Type | Description |
|---|---|
| Type 1 Diabetes | Autoimmune destruction of pancreatic beta cells causing absolute insulin deficiency |
| Type 2 Diabetes | Insulin resistance combined with decreased insulin production |
| Gestational Diabetes | Diabetes occurring during pregnancy |
| Prediabetes | Blood glucose higher than normal but not high enough for diabetes diagnosis |
Remember the "Three Ps."
Polyuria + Polydipsia + Polyphagia = Think Hyperglycemia
Hypoglycemia is generally considered blood glucose below 70 mg/dL.
Cold and clammy = Need some candy
Hypoglycemic patients are often:
| Hyperglycemia | Hypoglycemia |
|---|---|
| Warm, dry skin | Cool, clammy skin |
| Increased thirst | Sweating |
| Frequent urination | Tremors |
| Blurred vision | Confusion |
| Fatigue | Irritability |
| Gradual onset | Rapid onset |
| Insulin | Onset | Peak | Duration |
|---|---|---|---|
| Rapid-Acting (Lispro) | 15 min | 1 hr | 3–5 hrs |
| Short-Acting (Regular) | 30–60 min | 2–4 hrs | 5–8 hrs |
| Intermediate (NPH) | 1–2 hrs | 4–12 hrs | 12–18 hrs |
| Long-Acting (Glargine) | 1–2 hrs | No Peak | 24 hrs |
Think:
"Rapid insulin works right away."
Think:
"Long acting lasts all day."
DKA is a life-threatening complication most commonly seen in Type 1 Diabetes.
DKA = Dehydration + Ketones + Acidosis
HHS is most commonly seen in Type 2 Diabetes.
| DKA | HHS |
|---|---|
| Type 1 Diabetes | Type 2 Diabetes |
| Ketones Present | Minimal Ketones |
| Acidosis Present | No Significant Acidosis |
| Younger Patients | Older Patients |
Patient teaching questions are extremely common.
When answering diabetes questions, prioritize:
Diabetes Mellitus is one of the highest-yield subjects on the NCLEX-RN exam. Nurses should be confident in recognizing hyperglycemia, hypoglycemia, insulin actions, diabetic complications, and patient education principles.
Mastering these concepts can significantly improve NCLEX performance and clinical nursing practice.
4 Frequently Asked Questions About the NCLEX Nursing License & Exam
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