🚧 Under construction — VoTechWorks is being built. A free tech program — complimentary, as our commitment to get America working.
voTechWorksGrade 13 · a vocational technology learning center, by urbanicity
newSchoolWorks.com › VoTechWorks › Health & Personal Services › Practical Nursing (LPN) › Medical-Surgical Nursing › Lesson 5
HLT-LPN37-03 · Lesson 5 · 18 clock hours · lab

Endocrine Disorders: Diabetes Management and Thyroid Conditions

Objective. Students will perform blood glucose monitoring, demonstrate safe insulin preparation and injection technique, and describe nursing care for patients with hypoglycemia, hyperglycemia, diabetic ketoacidosis, and thyroid disorders.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed clinician in the field or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

Endocrine Disorders: Diabetes Management and Thyroid Conditions

The LPN's Role in Endocrine Care

Endocrine disorders affect the body's ability to produce or respond to hormones. As an LPN, you will frequently care for patients with diabetes mellitus and thyroid conditions. Your role centers on accurate assessment, safe medication administration, timely recognition of complications, and patient teaching under RN and provider supervision.

---

Diabetes Mellitus: Key Concepts

Type 1 diabetes results from autoimmune destruction of pancreatic beta cells, leaving the patient with little or no insulin production. These patients require insulin to survive. Type 2 diabetes involves insulin resistance combined with progressive decline in insulin secretion; it is managed with lifestyle changes, oral agents, and often insulin.

Blood glucose goals vary by patient and provider order. In general, fasting blood glucose between 80–130 mg/dL and postprandial glucose below 180 mg/dL are common targets for adults with diabetes, but always follow the individual patient's prescribed parameters.

---

Blood Glucose Monitoring

Capillary blood glucose testing with a glucometer is a core LPN skill. Follow these steps:

1. Perform hand hygiene and don gloves.

2. Check glucometer calibration and verify test strip expiration date.

3. Cleanse the patient's fingertip with an alcohol swab and allow to dry completely — residual alcohol falsely lowers results.

4. Use the lancet to puncture the lateral aspect of the fingertip (less nerve-dense than the pad).

5. Obtain an adequate blood drop; wipe away the first drop if instructed by facility policy.

6. Apply blood to the test strip and read the result.

7. Dispose of the lancet immediately into the sharps container — never recap.

8. Document the result and report it according to the provider's parameters.

Critical action — low reading (below 70 mg/dL — hypoglycemia): Treat immediately per protocol. If the patient is conscious and able to swallow, administer a fast-acting carbohydrate source (e.g., 15 grams of simple carbohydrate). Recheck blood glucose in 15 minutes. Notify the RN and provider.

Critical action — high reading (above 300 mg/dL — severe hyperglycemia): Notify the RN and provider immediately. Assess for signs of diabetic ketoacidosis (DKA) or hyperosmolar hyperglycemic state (HHS). Anticipate orders for additional insulin, IV fluids, and lab work.

---

Insulin Preparation and Injection

Insulin is a high-alert medication. Errors can cause life-threatening hypoglycemia.

Syringe selection: Always use a U-100 insulin syringe when drawing from a U-100 vial. Each small line on a standard 1-mL U-100 syringe represents 1 unit.

Preparation steps:

1. Confirm the right patient, right drug, right dose, right route, and right time.

2. Check the insulin type, concentration, and expiration date.

3. Gently roll cloudy insulin (NPH) between the palms to mix — never shake.

4. Cleanse the vial top with an alcohol swab.

5. Draw air equal to the ordered dose into the syringe; inject air into the vial.

6. Invert the vial and withdraw the prescribed dose; remove air bubbles.

7. Verify the dose with a second licensed nurse per facility policy.

Injection technique: Insulin is given subcutaneously. Common sites include the abdomen (fastest absorption), outer thigh, upper arm, and upper outer buttock. Rotate injection sites systematically within the same region to prevent lipodystrophy — fatty lumps or indentations that impair absorption.

Sharps safety: Dispose of the needle and syringe immediately into the sharps container after use. Never recap needles.

---

Diabetic Ketoacidosis (DKA)

DKA is a life-threatening complication of diabetes, most common in Type 1. It occurs when insulin deficiency causes the body to break down fat for energy, producing ketones and causing metabolic acidosis.

Classic signs: Kussmaul respirations (deep, rapid breathing — the body's attempt to blow off CO₂ and compensate for acidosis), fruity or acetone breath (from ketones), nausea and vomiting, abdominal pain, altered mental status, dehydration, elevated blood glucose (often above 250 mg/dL), and ketones in the urine or blood.

Nursing priorities:

---

Hypoglycemia

Signs include shakiness, diaphoresis, pallor, tachycardia, confusion, and seizure in severe cases. Treat promptly. Unconscious patients must not receive anything by mouth — notify the RN immediately for IV dextrose or glucagon administration.

---

Thyroid Disorders

Hypothyroidism (underactive thyroid) slows body processes. Signs include fatigue, weight gain, cold intolerance, constipation, dry skin, bradycardia, and depression. The classic severe form is myxedema coma — a medical emergency. Treatment is thyroid hormone replacement (e.g., levothyroxine). Teach patients to take it consistently, on an empty stomach, and not to stop without provider guidance.

Hyperthyroidism (overactive thyroid) speeds body processes. Signs include weight loss, heat intolerance, diaphoresis, tachycardia, palpitations, tremor, and anxiety. Thyroid storm is a life-threatening exacerbation — report high fever, extreme tachycardia, and agitation immediately. Antithyroid medications, beta-blockers, and supportive care are used under provider orders.

Nursing priority for both: Monitor vital signs, cardiac rhythm, weight, and mental status. Educate patients on consistent medication adherence.

Key terms10

HypoglycemiaBlood glucose below 70 mg/dL; causes symptoms such as shakiness, diaphoresis, and confusion; treated promptly with fast-acting carbohydrates in conscious patients.
HyperglycemiaAbnormally elevated blood glucose; in diabetes, values above 300 mg/dL require immediate notification of the provider and assessment for DKA or HHS.
Diabetic Ketoacidosis (DKA)A life-threatening complication of diabetes characterized by insulin deficiency, ketone production, metabolic acidosis, elevated blood glucose, Kussmaul respirations, and fruity breath.
Kussmaul RespirationsDeep, rapid, labored breathing seen in metabolic acidosis (particularly DKA) as the body attempts to compensate by exhaling carbon dioxide.
LipodystrophyAbnormal fatty tissue changes (lumps or indentations) at insulin injection sites caused by repeated injections in the same spot; prevented by systematic site rotation.
U-100 InsulinThe standard insulin concentration in the United States, meaning 100 units of insulin per milliliter; must be drawn with a U-100 insulin syringe to ensure accurate dosing.
HypothyroidismA condition in which the thyroid gland produces insufficient thyroid hormone, slowing metabolic processes; treated with thyroid hormone replacement therapy.
Thyroid StormA sudden, severe, life-threatening exacerbation of hyperthyroidism marked by extreme fever, tachycardia, and altered mental status; requires emergency intervention.
Subcutaneous InjectionInjection into the fatty tissue layer beneath the skin; the correct route for insulin administration.
Electrolyte Monitoring (DKA)Frequent measurement of serum electrolytes, especially potassium, during DKA treatment, because insulin therapy causes potassium to shift into cells and can precipitate hypokalemia.

Worked examples4

1. The provider orders 18 units of regular insulin from a U-100 vial using a standard U-100 insulin syringe. How many units should be marked on the syringe, and how many milliliters does that represent?
  1. U-100 means 100 units per 1 mL.
  2. The ordered dose is 18 units.
  3. Set up the proportion: 100 units = 1 mL, so 18 units = X mL.
  4. X = 18 ÷ 100 = 0.18 mL.
  5. On the U-100 insulin syringe, draw up to the 18-unit marking — each small line equals 1 unit, so count 18 lines.
Answer: Draw up to the 18-unit mark on the syringe, which equals 0.18 mL.
2. A patient's blood glucose reading is 54 mg/dL. The facility protocol states: 'For blood glucose below 70 mg/dL in a conscious patient, give 15 grams of fast-acting carbohydrate and recheck in 15 minutes.' The patient is alert and able to swallow. What are the nurse's priority actions in order?
  1. Recognize the reading of 54 mg/dL is below 70 mg/dL — this is hypoglycemia requiring immediate treatment.
  2. Confirm the patient is conscious and able to swallow safely before giving anything by mouth.
  3. Administer 15 grams of a fast-acting carbohydrate per protocol (e.g., 4 oz of juice or regular soda).
  4. Notify the RN and document the blood glucose reading, time, treatment given, and patient response.
  5. Recheck the blood glucose in 15 minutes; if still below 70 mg/dL, repeat treatment and notify provider.
Answer: Treat immediately with 15 g of fast-acting carbohydrate, notify the RN, and recheck blood glucose in 15 minutes.
3. A patient's blood glucose is 58 mg/dL before breakfast. After receiving 15 grams of carbohydrate, the nurse rechecks in 15 minutes and gets a reading of 74 mg/dL. Is this result acceptable, and what should the nurse do next?
  1. 74 mg/dL is above 70 mg/dL, so the blood glucose has returned to an acceptable range after treatment.
  2. The nurse should assess the patient for resolution of symptoms (shakiness, diaphoresis, confusion).
  3. Encourage the patient to eat their scheduled meal or snack to prevent recurrence.
  4. Document the original low reading, the treatment administered, the follow-up reading, and patient status.
  5. Continue monitoring and report any recurrence or persistent symptoms to the RN.
Answer: 74 mg/dL is acceptable (above 70 mg/dL); encourage the patient to eat, document all findings, and continue monitoring.
4. The provider orders 22 units of NPH insulin (U-100). Before drawing up the dose, what is the correct volume to draw, and what preparation step is unique to NPH insulin compared to regular insulin?
  1. Calculate volume: 22 units ÷ 100 units/mL = 0.22 mL.
  2. On the U-100 syringe, draw up to the 22-unit marking.
  3. NPH is a cloudy, intermediate-acting insulin that contains a suspension — it must be gently rolled between the palms before drawing to evenly distribute the suspension.
  4. Never shake insulin, as shaking creates air bubbles and may alter the dose drawn.
  5. Regular insulin is clear and requires no mixing step.
Answer: Draw to the 22-unit mark (0.22 mL); gently roll the NPH vial between the palms before drawing — do not shake.
In class: Lab station 1 – Blood glucose monitoring: each student performs capillary blood glucose testing using a glucometer on a practice finger or simulation device, documents the result, and states the action to take for a reading below 70 mg/dL and a reading above 300 mg/dL. · Lab station 2 – Insulin preparation: students draw up a prescribed dose of regular insulin from a vial using sterile technique, identify the correct syringe markings, and describe the rotation of injection sites; instructor evaluates each student individually. · Case-based theory segment: instructor leads a facilitated discussion of a patient presenting with DKA (Kussmaul respirations, fruity breath, altered mental status, elevated blood glucose and ketones), walking through nursing assessments, IV fluid and insulin administration principles, electrolyte monitoring, and patient teaching for discharge.
Materials: Glucometers and test strips, lancets, alcohol swabs, insulin syringes (U-100), normal saline vials labeled as insulin for practice, sharps containers, gloves, Lewis's Medical-Surgical Nursing, drug reference handbook
Check: Students perform all steps of blood glucose monitoring and insulin preparation correctly on a pass/fail skills checklist (100% on critical safety steps including correct dose, sterile technique, and proper sharps disposal); written quiz on DKA and hypoglycemia nursing care scored at 80% or higher.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Physiological Integrity: Pharmacological and Parenteral Therapies
1. A nurse checks a patient's blood glucose and obtains a reading of 62 mg/dL. The patient is alert and able to swallow. Which action should the nurse take first?
Physiological Integrity: Physiological Adaptation
2. A patient with type 1 diabetes is brought to the unit with Kussmaul respirations, fruity-smelling breath, blood glucose of 420 mg/dL, and confusion. Which condition do these findings most likely indicate?
Physiological Integrity: Pharmacological and Parenteral Therapies
3. When preparing to draw insulin from a U-100 vial, the nurse selects which syringe?
Physiological Integrity: Reduction of Risk Potential
4. During DKA treatment, a nurse is monitoring a patient receiving IV insulin. Which electrolyte imbalance is the priority to monitor because insulin infusion can cause it to drop to dangerous levels?
Health Promotion and Maintenance
5. A nurse is teaching a patient how to rotate insulin injection sites. Which statement by the nurse is correct?
Health Promotion and Maintenance
6. A patient is started on levothyroxine for hypothyroidism. Which instruction is most important for the nurse to include in discharge teaching?
Physiological Integrity: Physiological Adaptation
7. A patient with a history of hyperthyroidism suddenly develops a high fever, extreme tachycardia, and severe agitation. The nurse recognizes this as which emergency?
Safe and Effective Care Environment: Safety and Infection Control
8. After performing a fingerstick blood glucose test, which action by the student nurse requires immediate correction by the instructor?
Record this lesson on my transcript. Sign in with your key and enrollment email to record lessons (enroll free if you have no key). This page stays open to read and practise.
← Previous lessonProgram planNext lesson →