2026 Endocrine Pathophysiology Nursing
Practice Questions Answer Rationales
Diabetes Thyroid Disorders Adrenal
Disorders Hormonal Regulation Metabolic
Changes Review
SECTION 1: DIABETES MELLITUS (Questions 1-40)
1. A patient with type 1 diabetes mellitus presents to the emergency
department with blood glucose of 580 mg/dL, pH 7.15, and deep rapid
respirations. Which pathophysiologic process best explains the Kussmaul
respirations?
A) Respiratory compensation for metabolic alkalosis
B) Respiratory compensation for metabolic acidosis
C) Direct stimulation of the respiratory center by hyperglycemia
D) Decreased oxygen carrying capacity of hemoglobin
Answer: B) Respiratory compensation for metabolic acidosis
Rationale: In diabetic ketoacidosis (DKA), the accumulation of ketone bodies
(acetoacetic acid and beta-hydroxybutyric acid) causes metabolic acidosis. The
body attempts to compensate by increasing the respiratory rate and depth
(Kussmaul respirations) to blow off carbon dioxide, thereby raising the pH. This is
a compensatory mechanism for the metabolic acidosis, not alkalosis (A).
Hyperglycemia does not directly stimulate the respiratory center (C), and while
DKA can cause dehydration, the primary cause of Kussmaul respirations is acid-
base compensation (D).
,2. Which laboratory finding is most specific for diagnosing diabetic
ketoacidosis compared to hyperosmolar hyperglycemic state?
A) Blood glucose >600 mg/dL
B) Serum osmolality >320 mOsm/kg
C) Positive serum ketones
D) Serum bicarbonate <18 mEq/L
Answer: C) Positive serum ketones
Rationale: The presence of ketones in the blood (beta-hydroxybutyrate) is the
hallmark that distinguishes DKA from hyperosmolar hyperglycemic state (HHS).
While blood glucose can be elevated in both conditions (A), serum osmolality is
typically higher in HHS (B), and bicarbonate can be low in both conditions due to
acidosis (D). Ketone production occurs because of absolute insulin deficiency in
DKA, leading to lipolysis and ketogenesis, which is not a prominent feature of
HHS.
3. A nurse is teaching a patient with type 2 diabetes about the pathophysiology
of insulin resistance. Which statement by the patient indicates understanding?
A) "My pancreas doesn't make any insulin at all."
B) "My cells don't respond properly to insulin, so my pancreas works harder."
C) "My liver produces too much insulin."
D) "My body destroys its own insulin before it can work."
Answer: B) "My cells don't respond properly to insulin, so my pancreas
works harder."
Rationale: Type 2 diabetes is characterized by insulin resistance, where target
tissues (muscle, adipose, liver) have decreased sensitivity to insulin. Initially, the
pancreas compensates by producing more insulin (hyperinsulinemia), but
eventually beta-cell function declines. Option A describes type 1 diabetes. The
liver does not produce insulin (C), and insulin is not destroyed by the body in type
2 diabetes (D).
,4. In the fasting state, which process is primarily impaired in a patient with
type 1 diabetes, leading to hyperglycemia?
A) Glycogenolysis
B) Gluconeogenesis
C) Suppression of hepatic glucose output
D) Peripheral glucose uptake
Answer: C) Suppression of hepatic glucose output
Rationale: In the fasting state, insulin normally suppresses hepatic glucose
production (glycogenolysis and gluconeogenesis). In type 1 diabetes, the lack of
insulin leads to unrestrained hepatic glucose output, which is the primary cause of
fasting hyperglycemia. While glycogenolysis (A) and gluconeogenesis (B) are
components of hepatic glucose output, option C encompasses both and is the most
comprehensive answer. Peripheral glucose uptake (D) is more relevant in the
postprandial state.
5. A patient with diabetes presents with a blood glucose of 45 mg/dL. Which
symptom would the nurse expect to assess first?
A) Polyuria
B) Polydipsia
C) Diaphoresis
D) Blurred vision
Answer: C) Diaphoresis
Rationale: Hypoglycemia triggers the sympathetic nervous system, causing
symptoms such as diaphoresis, tremors, palpitations, and anxiety. These are early
adrenergic symptoms. Polyuria (A) and polydipsia (B) are symptoms of
hyperglycemia. Blurred vision (D) can occur with both hypo- and hyperglycemia
but is not the first expected symptom.
, 6. Which pathophysiologic mechanism explains why patients with DKA
develop abdominal pain?
A) Direct irritation of the peritoneum by ketones
B) Gastric distention from polyphagia
C) Dehydration-induced mesenteric ischemia
D) Metabolic acidosis causing smooth muscle paralysis
Answer: A) Direct irritation of the peritoneum by ketones
Rationale: Ketone bodies are acidic and can cause direct irritation of the
peritoneum, leading to abdominal pain in DKA. While dehydration (C) can
contribute to abdominal discomfort, the primary mechanism is ketone-induced
irritation. Polyphagia (B) is a symptom of hyperglycemia, not a cause of
abdominal pain. Metabolic acidosis (D) does not typically cause smooth muscle
paralysis.
7. A patient with type 2 diabetes has a hemoglobin A1c of 9.2%. Which
interpretation is most accurate?
A) The patient's average blood glucose over the past 2-3 weeks has been elevated
B) The patient's average blood glucose over the past 2-3 months has been elevated
C) The patient had a single episode of severe hyperglycemia
D) The patient is at low risk for diabetes-related complications
Answer: B) The patient's average blood glucose over the past 2-3 months has
been elevated
Rationale: Hemoglobin A1c reflects the average blood glucose over the lifespan
of red blood cells, approximately 2-3 months. An A1c of 9.2% indicates poor
glycemic control and a significantly elevated average blood glucose. It does not
reflect a single episode (C) or a short-term average (A). An A1c >7% indicates
increased risk for complications (D).
Practice Questions Answer Rationales
Diabetes Thyroid Disorders Adrenal
Disorders Hormonal Regulation Metabolic
Changes Review
SECTION 1: DIABETES MELLITUS (Questions 1-40)
1. A patient with type 1 diabetes mellitus presents to the emergency
department with blood glucose of 580 mg/dL, pH 7.15, and deep rapid
respirations. Which pathophysiologic process best explains the Kussmaul
respirations?
A) Respiratory compensation for metabolic alkalosis
B) Respiratory compensation for metabolic acidosis
C) Direct stimulation of the respiratory center by hyperglycemia
D) Decreased oxygen carrying capacity of hemoglobin
Answer: B) Respiratory compensation for metabolic acidosis
Rationale: In diabetic ketoacidosis (DKA), the accumulation of ketone bodies
(acetoacetic acid and beta-hydroxybutyric acid) causes metabolic acidosis. The
body attempts to compensate by increasing the respiratory rate and depth
(Kussmaul respirations) to blow off carbon dioxide, thereby raising the pH. This is
a compensatory mechanism for the metabolic acidosis, not alkalosis (A).
Hyperglycemia does not directly stimulate the respiratory center (C), and while
DKA can cause dehydration, the primary cause of Kussmaul respirations is acid-
base compensation (D).
,2. Which laboratory finding is most specific for diagnosing diabetic
ketoacidosis compared to hyperosmolar hyperglycemic state?
A) Blood glucose >600 mg/dL
B) Serum osmolality >320 mOsm/kg
C) Positive serum ketones
D) Serum bicarbonate <18 mEq/L
Answer: C) Positive serum ketones
Rationale: The presence of ketones in the blood (beta-hydroxybutyrate) is the
hallmark that distinguishes DKA from hyperosmolar hyperglycemic state (HHS).
While blood glucose can be elevated in both conditions (A), serum osmolality is
typically higher in HHS (B), and bicarbonate can be low in both conditions due to
acidosis (D). Ketone production occurs because of absolute insulin deficiency in
DKA, leading to lipolysis and ketogenesis, which is not a prominent feature of
HHS.
3. A nurse is teaching a patient with type 2 diabetes about the pathophysiology
of insulin resistance. Which statement by the patient indicates understanding?
A) "My pancreas doesn't make any insulin at all."
B) "My cells don't respond properly to insulin, so my pancreas works harder."
C) "My liver produces too much insulin."
D) "My body destroys its own insulin before it can work."
Answer: B) "My cells don't respond properly to insulin, so my pancreas
works harder."
Rationale: Type 2 diabetes is characterized by insulin resistance, where target
tissues (muscle, adipose, liver) have decreased sensitivity to insulin. Initially, the
pancreas compensates by producing more insulin (hyperinsulinemia), but
eventually beta-cell function declines. Option A describes type 1 diabetes. The
liver does not produce insulin (C), and insulin is not destroyed by the body in type
2 diabetes (D).
,4. In the fasting state, which process is primarily impaired in a patient with
type 1 diabetes, leading to hyperglycemia?
A) Glycogenolysis
B) Gluconeogenesis
C) Suppression of hepatic glucose output
D) Peripheral glucose uptake
Answer: C) Suppression of hepatic glucose output
Rationale: In the fasting state, insulin normally suppresses hepatic glucose
production (glycogenolysis and gluconeogenesis). In type 1 diabetes, the lack of
insulin leads to unrestrained hepatic glucose output, which is the primary cause of
fasting hyperglycemia. While glycogenolysis (A) and gluconeogenesis (B) are
components of hepatic glucose output, option C encompasses both and is the most
comprehensive answer. Peripheral glucose uptake (D) is more relevant in the
postprandial state.
5. A patient with diabetes presents with a blood glucose of 45 mg/dL. Which
symptom would the nurse expect to assess first?
A) Polyuria
B) Polydipsia
C) Diaphoresis
D) Blurred vision
Answer: C) Diaphoresis
Rationale: Hypoglycemia triggers the sympathetic nervous system, causing
symptoms such as diaphoresis, tremors, palpitations, and anxiety. These are early
adrenergic symptoms. Polyuria (A) and polydipsia (B) are symptoms of
hyperglycemia. Blurred vision (D) can occur with both hypo- and hyperglycemia
but is not the first expected symptom.
, 6. Which pathophysiologic mechanism explains why patients with DKA
develop abdominal pain?
A) Direct irritation of the peritoneum by ketones
B) Gastric distention from polyphagia
C) Dehydration-induced mesenteric ischemia
D) Metabolic acidosis causing smooth muscle paralysis
Answer: A) Direct irritation of the peritoneum by ketones
Rationale: Ketone bodies are acidic and can cause direct irritation of the
peritoneum, leading to abdominal pain in DKA. While dehydration (C) can
contribute to abdominal discomfort, the primary mechanism is ketone-induced
irritation. Polyphagia (B) is a symptom of hyperglycemia, not a cause of
abdominal pain. Metabolic acidosis (D) does not typically cause smooth muscle
paralysis.
7. A patient with type 2 diabetes has a hemoglobin A1c of 9.2%. Which
interpretation is most accurate?
A) The patient's average blood glucose over the past 2-3 weeks has been elevated
B) The patient's average blood glucose over the past 2-3 months has been elevated
C) The patient had a single episode of severe hyperglycemia
D) The patient is at low risk for diabetes-related complications
Answer: B) The patient's average blood glucose over the past 2-3 months has
been elevated
Rationale: Hemoglobin A1c reflects the average blood glucose over the lifespan
of red blood cells, approximately 2-3 months. An A1c of 9.2% indicates poor
glycemic control and a significantly elevated average blood glucose. It does not
reflect a single episode (C) or a short-term average (A). An A1c >7% indicates
increased risk for complications (D).
