1 Endocrine Assessment and Nursing Foundations

Hormones and feedback

Hormones are chemical messengers released into the bloodstream. They coordinate processes such as metabolism, growth, stress responses, and fluid balance; their effects depend on the target tissue and the amount of hormone available. Endocrine glands include the pituitary, thyroid, and adrenal glands, as well as hormone-producing cells of the pancreas.

Feedback and hormone levels

Many hormones are regulated through negative feedback. In the thyroid pathway, the hypothalamus signals the pituitary, the pituitary releases thyroid-stimulating hormone (TSH), and TSH stimulates the thyroid to produce T4 and T3. As thyroid hormone levels rise, the signals that drive TSH release decrease.

This feedback pattern helps explain why a primary thyroid problem often produces opposite-direction changes in TSH and thyroid hormone. Hormone levels can also vary with time of day, illness, stress, medication use, and other physiologic conditions, so results should be interpreted in context rather than in isolation.

Focused endocrine assessment

A focused endocrine assessment combines the patient’s history, physical findings, medication review, and relevant laboratory results. Ask about changes in energy, weight, appetite, thirst, urination, temperature tolerance, sleep, mood, and bowel patterns. Clarify when symptoms began and how they have progressed, whether there has been recent illness or stress, and whether the patient or family has a history of endocrine disease.

Review prescription and nonprescription medicines and supplements, including how the patient takes them. Some medicines can affect hormone levels or test interpretation. Ask about the patient’s usual self-management routine, access to medicines and monitoring supplies, ability to recognize warning signs, and barriers to following the plan.

Assess vital signs, weight, hydration, mental status, skin, and other findings guided by symptoms and the care plan. For a patient with diabetes, include glucose-monitoring practices and recent low- or high-glucose events. Because thyroid disorders can affect many body systems, connect reported symptoms with findings such as heart-rate or weight changes rather than assessing the neck alone.

Endocrine tests and nursing responsibilities

Endocrine testing may use blood, urine, or saliva. Some tests involve a single measurement; others assess how hormone levels change after a stimulating or suppressing medicine. Before collecting a sample, confirm the ordered test and its preparation requirements. Fasting, collection time, medication instructions, and timed specimen collection vary, so check local instructions and clarify uncertainties. Document relevant medicines, symptoms, and collection timing, and report results or symptoms that require prompt follow-up.

Thyroid testing

TSH and free T4 are common tests; T3 or thyroid antibodies may also be tested. TSH is often checked first. A high TSH commonly accompanies primary hypothyroidism, while a low TSH commonly accompanies hyperthyroidism. For example, high TSH with low free T4 commonly suggests primary hypothyroidism. Interpret the pattern with the patient’s history, clinical assessment, and thyroid hormone results.

Diabetes testing

Tests used to assess or diagnose diabetes include A1C, fasting plasma glucose, an oral glucose tolerance test, and, in some symptomatic situations, random plasma glucose. A1C reflects average glucose over roughly three months, whereas fasting glucose is a point-in-time measurement. Diagnostic testing differs from routine home glucose monitoring, and abnormal results may need confirmation according to clinical criteria. A home glucose-meter result by itself does not diagnose diabetes.

Cortisol testing

Morning cortisol and, when indicated, an ACTH (corticotropin) stimulation test may be used when assessing whether cortisol production is inadequate. The test choice and timing matter. Record steroid exposure and follow the prescriber’s instructions; do not independently stop prescribed steroids for testing.

Patient education and safety

Use plain language and tailor teaching to the patient’s priorities. Use teach-back by asking the patient to explain or demonstrate the plan in their own words. Reinforce the purpose and schedule of medicines, the monitoring plan, follow-up testing, and when to contact the care team. Encourage patients to discuss medicines and supplements that may affect test results rather than stopping or changing them on their own.

For diabetes, explain monitoring as prescribed, how to recognize and respond to hypoglycemia, and whom to contact when illness disrupts the usual routine. A glucose below $70\ \text{mg/dL}$ ($3.9\ \text{mmol/L}$) is an alert value. If the person is awake and able to swallow, fast-acting glucose is generally used and glucose is rechecked after $15$ minutes. Repeat treatment if glucose remains low, following the individualized plan.

If the person cannot safely swallow or has severe symptoms, do not give food or drink by mouth. Activate emergency help and use prescribed glucagon or other treatment according to protocol. Suspected severe hypoglycemia, altered consciousness, persistent vomiting, marked dehydration, or abnormal deep or rapid breathing warrants urgent assessment. Diabetic ketoacidosis (DKA) and hyperglycemic hyperosmolar state (HHS) are life-threatening emergencies; follow emergency protocols and escalate promptly rather than relying on routine self-care advice.

Applying assessment and safety principles

Apply the assessment and safety principles to these clinical situations:

• A patient has high TSH and low free T4. This pattern commonly suggests primary hypothyroidism; interpret it with the patient’s history and clinical assessment.

• An ACTH stimulation test may be ordered after an initial cortisol test to assess whether the adrenal glands increase cortisol production in response to stimulation. Follow the ordered timing and medication instructions.

• A patient with diabetes is sweaty and confused, and the glucose reading is $58\ \text{mg/dL}$. Treat this as hypoglycemia. Assess whether the patient can swallow; give fast-acting glucose only if safe and follow the care plan or protocol. If the patient cannot swallow safely, give nothing by mouth and initiate urgent assistance and prescribed emergency treatment.

• A home glucose-meter result alone cannot diagnose diabetes. Diagnosis uses appropriate laboratory testing and clinical criteria; home monitoring supports ongoing care.