Page 1 of 170
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DOMAIN I: ASSESSMENT OF THE DIABETES CONTINUUM
## Section 1.1: Diabetes Pathophysiology & Epidemiology
### Question 1
A 34-year-old patient presents with polyuria, polydipsia, and unintended weight loss of 15
pounds over 6 weeks. Laboratory findings reveal a fasting plasma glucose of 312 mg/dL, random
C-peptide of 0.2 ng/mL (normal 0.9-4.0 ng/mL), and positive glutamic acid decarboxylase
(GAD) antibodies. Which of the following best describes the underlying pathophysiology?
A. Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency
B. Progressive insulin resistance with relative insulin deficiency
C. Defective insulin secretion due to pancreatic exocrine disease
D. Insulin receptor antibodies blocking insulin action
**CorreCt Answer: A**
,Page 2 of 170
**Rationale:** This patient's presentation with classic hyperglycemic symptoms, markedly
elevated blood glucose, very low C-peptide (indicating minimal endogenous insulin production),
and positive GAD antibodies is consistent with autoimmune type 1 diabetes. Type 1 diabetes is
characterized by T-cell-mediated autoimmune destruction of pancreatic beta cells, leading to
absolute insulin deficiency. The presence of islet autoantibodies (GAD, IA-2, ZnT8, or ICA)
confirms the autoimmune etiology. Type 2 diabetes (B) involves insulin resistance with relative
insulin deficiency and is typically associated with normal or elevated C-peptide. Pancreatic
causes (C) would present with other manifestations of exocrine insufficiency. Insulin receptor
antibodies (D) are a rare cause of type B insulin resistance.
---
### Question 2
Which of the following best describes the pathophysiology of insulin resistance in type 2
diabetes?
A. Decreased number of insulin receptors on target cells
B. Impaired post-receptor signaling pathways in adipose, muscle, and hepatic tissues
C. Autoimmune destruction of pancreatic beta cells
D. Increased hepatic glucose production with normal peripheral glucose uptake
**CorreCt Answer: B**
**Rationale:** Insulin resistance in type 2 diabetes primarily results from impaired post-
receptor intracellular signaling pathways, particularly at the level of insulin receptor substrate
(IRS) proteins and downstream PI3K/Akt signaling in adipose tissue, skeletal muscle, and liver.
While there may be some reduction in insulin receptor number, the primary defect is
downstream. The pathophysiology involves a complex interplay of genetic predisposition,
obesity, physical inactivity, and chronic inflammation. Autoimmune destruction (C) characterizes
type 1 diabetes. Hepatic glucose production is increased in type 2 diabetes (D), but this is
accompanied by peripheral insulin resistance, not normal peripheral glucose uptake.
,Page 3 of 170
### Question 3
A 62-year-old patient with a 15-year history of type 2 diabetes is admitted with blood glucose of
820 mg/dL, serum osmolality of 340 mOsm/kg, and absent serum ketones. Which
pathophysiologic mechanism best explains this presentation?
A. Absolute insulin deficiency leading to lipolysis and ketogenesis
B. Severe hyperglycemia causing osmotic diuresis and profound dehydration with sufficient
insulin to prevent ketosis
C. Lactic acid accumulation from metformin toxicity
D. Impaired renal glucose excretion due to chronic kidney disease
**CorreCt Answer: B**
**Rationale:** This presentation is classic for Hyperosmolar Hyperglycemic State (HHS),
characterized by severe hyperglycemia (>600 mg/dL), hyperosmolality (>320 mOsm/kg), and
absent or minimal ketosis. In HHS, there is sufficient circulating insulin to prevent lipolysis and
ketogenesis but inadequate insulin to facilitate glucose uptake, resulting in severe hyperglycemia.
The osmotic diuresis leads to profound dehydration with electrolyte losses. HHS typically occurs
in older adults with type 2 diabetes. Option A describes diabetic ketoacidosis (DKA), which
presents with ketosis and acidosis. Option C describes a different condition. Option D does not
explain the presentation.
---
### Question 4
A 28-year-old patient with type 1 diabetes reports consistently elevated morning blood glucose
readings despite appropriate bedtime glucose and basal insulin. Which of the following
pathophysiologic phenomena is the MOST likely cause?
A. The Somogyi effect
, Page 4 of 170
B. The dawn phenomenon
C. Gastroparesis
D. Inadequate insulin absorption
**CorreCt Answer: B**
**Rationale:** The dawn phenomenon is characterized by early morning hyperglycemia
resulting from the normal surge of counterregulatory hormones (growth hormone, cortisol,
glucagon, epinephrine) that occurs between approximately 4:00 AM and 8:00 AM. This
hormonal surge increases hepatic glucose production, and in individuals with type 1 diabetes
who lack the ability to mount an endogenous insulin response, blood glucose rises significantly.
The Somogyi effect (A) is rebound hyperglycemia following nocturnal hypoglycemia, which is
less common and requires confirmation with nocturnal glucose monitoring. Gastroparesis (C)
typically causes erratic postprandial glucose excursions. Inadequate insulin absorption (D) would
cause more generalized hyperglycemia, not isolated morning elevations.
---
### Question 5
Which of the following genetic factors is MOST strongly associated with the development of
type 1 diabetes?
A. HLA-DR3 and HLA-DR4 haplotypes
B. TCF7L2 gene variant
C. PPARG gene polymorphism
D. KCNJ11 gene mutation
**CorreCt Answer: A**
CDCES® CERTIFICATION EXAM PREP QUESTION
BANK | 250+ PRACTICE QUESTIONS WITH
VERIFIED ANSWERS & DETAILED RATIONALES |
LATEST CBDCE BLUEPRINT & ADA STANDARDS
OF CARE | COMPLETE STUDY GUIDE | A+
DOMAIN I: ASSESSMENT OF THE DIABETES CONTINUUM
## Section 1.1: Diabetes Pathophysiology & Epidemiology
### Question 1
A 34-year-old patient presents with polyuria, polydipsia, and unintended weight loss of 15
pounds over 6 weeks. Laboratory findings reveal a fasting plasma glucose of 312 mg/dL, random
C-peptide of 0.2 ng/mL (normal 0.9-4.0 ng/mL), and positive glutamic acid decarboxylase
(GAD) antibodies. Which of the following best describes the underlying pathophysiology?
A. Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency
B. Progressive insulin resistance with relative insulin deficiency
C. Defective insulin secretion due to pancreatic exocrine disease
D. Insulin receptor antibodies blocking insulin action
**CorreCt Answer: A**
,Page 2 of 170
**Rationale:** This patient's presentation with classic hyperglycemic symptoms, markedly
elevated blood glucose, very low C-peptide (indicating minimal endogenous insulin production),
and positive GAD antibodies is consistent with autoimmune type 1 diabetes. Type 1 diabetes is
characterized by T-cell-mediated autoimmune destruction of pancreatic beta cells, leading to
absolute insulin deficiency. The presence of islet autoantibodies (GAD, IA-2, ZnT8, or ICA)
confirms the autoimmune etiology. Type 2 diabetes (B) involves insulin resistance with relative
insulin deficiency and is typically associated with normal or elevated C-peptide. Pancreatic
causes (C) would present with other manifestations of exocrine insufficiency. Insulin receptor
antibodies (D) are a rare cause of type B insulin resistance.
---
### Question 2
Which of the following best describes the pathophysiology of insulin resistance in type 2
diabetes?
A. Decreased number of insulin receptors on target cells
B. Impaired post-receptor signaling pathways in adipose, muscle, and hepatic tissues
C. Autoimmune destruction of pancreatic beta cells
D. Increased hepatic glucose production with normal peripheral glucose uptake
**CorreCt Answer: B**
**Rationale:** Insulin resistance in type 2 diabetes primarily results from impaired post-
receptor intracellular signaling pathways, particularly at the level of insulin receptor substrate
(IRS) proteins and downstream PI3K/Akt signaling in adipose tissue, skeletal muscle, and liver.
While there may be some reduction in insulin receptor number, the primary defect is
downstream. The pathophysiology involves a complex interplay of genetic predisposition,
obesity, physical inactivity, and chronic inflammation. Autoimmune destruction (C) characterizes
type 1 diabetes. Hepatic glucose production is increased in type 2 diabetes (D), but this is
accompanied by peripheral insulin resistance, not normal peripheral glucose uptake.
,Page 3 of 170
### Question 3
A 62-year-old patient with a 15-year history of type 2 diabetes is admitted with blood glucose of
820 mg/dL, serum osmolality of 340 mOsm/kg, and absent serum ketones. Which
pathophysiologic mechanism best explains this presentation?
A. Absolute insulin deficiency leading to lipolysis and ketogenesis
B. Severe hyperglycemia causing osmotic diuresis and profound dehydration with sufficient
insulin to prevent ketosis
C. Lactic acid accumulation from metformin toxicity
D. Impaired renal glucose excretion due to chronic kidney disease
**CorreCt Answer: B**
**Rationale:** This presentation is classic for Hyperosmolar Hyperglycemic State (HHS),
characterized by severe hyperglycemia (>600 mg/dL), hyperosmolality (>320 mOsm/kg), and
absent or minimal ketosis. In HHS, there is sufficient circulating insulin to prevent lipolysis and
ketogenesis but inadequate insulin to facilitate glucose uptake, resulting in severe hyperglycemia.
The osmotic diuresis leads to profound dehydration with electrolyte losses. HHS typically occurs
in older adults with type 2 diabetes. Option A describes diabetic ketoacidosis (DKA), which
presents with ketosis and acidosis. Option C describes a different condition. Option D does not
explain the presentation.
---
### Question 4
A 28-year-old patient with type 1 diabetes reports consistently elevated morning blood glucose
readings despite appropriate bedtime glucose and basal insulin. Which of the following
pathophysiologic phenomena is the MOST likely cause?
A. The Somogyi effect
, Page 4 of 170
B. The dawn phenomenon
C. Gastroparesis
D. Inadequate insulin absorption
**CorreCt Answer: B**
**Rationale:** The dawn phenomenon is characterized by early morning hyperglycemia
resulting from the normal surge of counterregulatory hormones (growth hormone, cortisol,
glucagon, epinephrine) that occurs between approximately 4:00 AM and 8:00 AM. This
hormonal surge increases hepatic glucose production, and in individuals with type 1 diabetes
who lack the ability to mount an endogenous insulin response, blood glucose rises significantly.
The Somogyi effect (A) is rebound hyperglycemia following nocturnal hypoglycemia, which is
less common and requires confirmation with nocturnal glucose monitoring. Gastroparesis (C)
typically causes erratic postprandial glucose excursions. Inadequate insulin absorption (D) would
cause more generalized hyperglycemia, not isolated morning elevations.
---
### Question 5
Which of the following genetic factors is MOST strongly associated with the development of
type 1 diabetes?
A. HLA-DR3 and HLA-DR4 haplotypes
B. TCF7L2 gene variant
C. PPARG gene polymorphism
D. KCNJ11 gene mutation
**CorreCt Answer: A**
