CDCES (CERTIFIED DIABETES CARE AND
EDUCATION SPECIALIST) EXAM
Practice Exam — 250 MCQs
1. What is the primary role of a Certified Diabetes Care and Education Specialist (CDCES)?
A) Prescribing medications for diabetes management
B) Providing evidence-based diabetes self-management education and support to improve
outcomes (correct answer)
C) Performing surgical procedures for diabetes complications
D) Diagnosing diabetes and related conditions
Rationale: The CDCES provides evidence-based diabetes self-management education and
support (DSMES) to empower individuals with diabetes to make informed decisions about
their care, improve self-management skills, and achieve optimal health outcomes —
education and support, not prescribing or diagnosing.
2. What is the diagnostic criterion for diabetes using fasting plasma glucose (FPG)?
A) FPG ≥ 110 mg/dL on two separate occasions
B) FPG ≥ 126 mg/dL on two separate occasions (correct answer)
C) FPG ≥ 100 mg/dL on two separate occasions
D) FPG ≥ 140 mg/dL on two separate occasions
Rationale: Per ADA Standards of Care, diabetes is diagnosed when fasting plasma glucose
is ≥126 mg/dL (7.0 mmol/L) confirmed on two separate occasions, or with classic symptoms
of hyperglycemia; fasting is defined as no caloric intake for at least 8 hours.
3. What A1C level is diagnostic for diabetes?
A) A1C ≥ 5.7%
B) A1C ≥ 6.0%
C) A1C ≥ 6.5% (correct answer)
D) A1C ≥ 7.0%
,Rationale: An A1C ≥ 6.5% (48 mmol/mol) on two separate tests using a standardized,
NGSP-certified assay is diagnostic for diabetes; A1C 5.7–6.4% indicates prediabetes; A1C
below 5.7% is considered normal.
4. What is the 2-hour plasma glucose value diagnostic for diabetes on an oral glucose tolerance
test (OGTT)?
A) ≥ 140 mg/dL
B) ≥ 160 mg/dL
C) ≥ 180 mg/dL
D) ≥ 200 mg/dL (correct answer)
Rationale: During a 75g OGTT, a 2-hour plasma glucose of ≥200 mg/dL (11.1 mmol/L) is
diagnostic for diabetes; a 2-hour value of 140–199 mg/dL indicates impaired glucose
tolerance (prediabetes).
5. Which A1C range defines prediabetes?
A) 5.0–5.6%
B) 5.7–6.4% (correct answer)
C) 6.0–6.9%
D) 6.5–7.0%
Rationale: Prediabetes is defined as A1C 5.7–6.4% (ADA), fasting glucose 100–125 mg/dL
(impaired fasting glucose), or 2-hour OGTT glucose 140–199 mg/dL (impaired glucose
tolerance); all indicate increased risk for type 2 diabetes and cardiovascular disease.
6. What is the ADA general A1C target for most non-pregnant adults with diabetes?
A) Less than 6.0%
B) Less than 6.5%
C) Less than 7.0% (correct answer)
D) Less than 7.5%
Rationale: The ADA recommends an A1C goal of less than 7.0% for most non-pregnant
adults to reduce the risk of microvascular complications; less stringent goals (e.g., <8.0%)
may be appropriate for older adults with frailty, limited life expectancy, or high
hypoglycemia risk.
,7. What percentage of the population has undiagnosed type 2 diabetes?
A) 10%
B) 15%
C) 21% (correct answer)
D) 30%
Rationale: According to CDC data, approximately 21% of people with diabetes in the
United States are undiagnosed — highlighting the critical importance of screening, early
identification, and diabetes education to prevent complications from undetected disease.
8. What is "diabetes self-management education and support" (DSMES)?
A) A physician-led program focused on medication management
B) An ongoing process facilitating knowledge, skills, and ability for diabetes self-care,
informed by evidence-based guidelines (correct answer)
C) A program exclusively for newly diagnosed patients
D) A nutrition counseling program for weight loss
Rationale: DSMES is the ongoing process of facilitating the knowledge, skill, and ability
necessary for diabetes self-care; it addresses the biological, psychological, and social needs
of the person; evidence shows DSMES improves A1C, reduces complications, lowers costs,
and improves quality of life.
9. What are the four critical time points for DSMES referral per ADA guidelines?
A) Diagnosis, annually, with complications, and life changes
B) At diagnosis, annually, when complicating factors develop, and during transitions in
life and care (correct answer)
C) At diagnosis, at 3 months, at 6 months, and at 1 year
D) At diagnosis, when A1C is elevated, when medication changes, and at discharge
Rationale: ADA identifies four critical times for DSMES: (1) at diagnosis, (2) annually for
assessment and education updates, (3) when new complicating factors arise, and (4) during
transitions of care (hospitalization, new care setting, change in health status or life
circumstances).
10. What is the hallmark pathophysiology of type 1 diabetes?
A) Insulin resistance with relative insulin deficiency
, B) Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency
(correct answer)
C) Excess glucagon secretion from alpha cells
D) Impaired incretin effect from the gastrointestinal tract
Rationale: Type 1 diabetes results from autoimmune destruction of insulin-producing beta
cells in the pancreatic islets of Langerhans, leading to absolute insulin deficiency; persons
with type 1 diabetes require exogenous insulin for survival; autoantibodies (anti-GAD,
anti-insulin, anti-IA-2, anti-ZnT8) are markers of this process.
11. What is the primary defect in type 2 diabetes?
A) Autoimmune beta cell destruction
B) Combination of insulin resistance and progressive beta cell failure (correct answer)
C) Complete absence of insulin secretion
D) Overproduction of insulin by the pancreas
Rationale: Type 2 diabetes is characterized by a dual defect: insulin resistance (particularly
in muscle, liver, and adipose tissue) combined with progressive beta cell failure unable to
compensate for increased insulin demand; this leads to relative insulin deficiency and
hyperglycemia.
12. What is the Ominous Octet concept in type 2 diabetes pathophysiology?
A) Eight medications used to treat type 2 diabetes
B) Eight pathophysiological defects contributing to hyperglycemia in type 2 diabetes
including beta cell failure, alpha cell excess, muscle insulin resistance, liver glucose
overproduction, and others (correct answer)
C) Eight diagnostic criteria for type 2 diabetes
D) Eight complications of poorly controlled type 2 diabetes
Rationale: Ralph DeFronzo's "Ominous Octet" describes eight organs/mechanisms
contributing to type 2 diabetes hyperglycemia: beta cell failure, alpha cell dysfunction
(excess glucagon), muscle insulin resistance, hepatic glucose overproduction, decreased
incretin effect, increased lipolysis (adipocytes), renal glucose reabsorption (kidney), and
brain neurotransmitter dysfunction.
13. What autoantibodies are associated with type 1 diabetes?
A) Anti-nuclear antibody (ANA) and anti-dsDNA
EDUCATION SPECIALIST) EXAM
Practice Exam — 250 MCQs
1. What is the primary role of a Certified Diabetes Care and Education Specialist (CDCES)?
A) Prescribing medications for diabetes management
B) Providing evidence-based diabetes self-management education and support to improve
outcomes (correct answer)
C) Performing surgical procedures for diabetes complications
D) Diagnosing diabetes and related conditions
Rationale: The CDCES provides evidence-based diabetes self-management education and
support (DSMES) to empower individuals with diabetes to make informed decisions about
their care, improve self-management skills, and achieve optimal health outcomes —
education and support, not prescribing or diagnosing.
2. What is the diagnostic criterion for diabetes using fasting plasma glucose (FPG)?
A) FPG ≥ 110 mg/dL on two separate occasions
B) FPG ≥ 126 mg/dL on two separate occasions (correct answer)
C) FPG ≥ 100 mg/dL on two separate occasions
D) FPG ≥ 140 mg/dL on two separate occasions
Rationale: Per ADA Standards of Care, diabetes is diagnosed when fasting plasma glucose
is ≥126 mg/dL (7.0 mmol/L) confirmed on two separate occasions, or with classic symptoms
of hyperglycemia; fasting is defined as no caloric intake for at least 8 hours.
3. What A1C level is diagnostic for diabetes?
A) A1C ≥ 5.7%
B) A1C ≥ 6.0%
C) A1C ≥ 6.5% (correct answer)
D) A1C ≥ 7.0%
,Rationale: An A1C ≥ 6.5% (48 mmol/mol) on two separate tests using a standardized,
NGSP-certified assay is diagnostic for diabetes; A1C 5.7–6.4% indicates prediabetes; A1C
below 5.7% is considered normal.
4. What is the 2-hour plasma glucose value diagnostic for diabetes on an oral glucose tolerance
test (OGTT)?
A) ≥ 140 mg/dL
B) ≥ 160 mg/dL
C) ≥ 180 mg/dL
D) ≥ 200 mg/dL (correct answer)
Rationale: During a 75g OGTT, a 2-hour plasma glucose of ≥200 mg/dL (11.1 mmol/L) is
diagnostic for diabetes; a 2-hour value of 140–199 mg/dL indicates impaired glucose
tolerance (prediabetes).
5. Which A1C range defines prediabetes?
A) 5.0–5.6%
B) 5.7–6.4% (correct answer)
C) 6.0–6.9%
D) 6.5–7.0%
Rationale: Prediabetes is defined as A1C 5.7–6.4% (ADA), fasting glucose 100–125 mg/dL
(impaired fasting glucose), or 2-hour OGTT glucose 140–199 mg/dL (impaired glucose
tolerance); all indicate increased risk for type 2 diabetes and cardiovascular disease.
6. What is the ADA general A1C target for most non-pregnant adults with diabetes?
A) Less than 6.0%
B) Less than 6.5%
C) Less than 7.0% (correct answer)
D) Less than 7.5%
Rationale: The ADA recommends an A1C goal of less than 7.0% for most non-pregnant
adults to reduce the risk of microvascular complications; less stringent goals (e.g., <8.0%)
may be appropriate for older adults with frailty, limited life expectancy, or high
hypoglycemia risk.
,7. What percentage of the population has undiagnosed type 2 diabetes?
A) 10%
B) 15%
C) 21% (correct answer)
D) 30%
Rationale: According to CDC data, approximately 21% of people with diabetes in the
United States are undiagnosed — highlighting the critical importance of screening, early
identification, and diabetes education to prevent complications from undetected disease.
8. What is "diabetes self-management education and support" (DSMES)?
A) A physician-led program focused on medication management
B) An ongoing process facilitating knowledge, skills, and ability for diabetes self-care,
informed by evidence-based guidelines (correct answer)
C) A program exclusively for newly diagnosed patients
D) A nutrition counseling program for weight loss
Rationale: DSMES is the ongoing process of facilitating the knowledge, skill, and ability
necessary for diabetes self-care; it addresses the biological, psychological, and social needs
of the person; evidence shows DSMES improves A1C, reduces complications, lowers costs,
and improves quality of life.
9. What are the four critical time points for DSMES referral per ADA guidelines?
A) Diagnosis, annually, with complications, and life changes
B) At diagnosis, annually, when complicating factors develop, and during transitions in
life and care (correct answer)
C) At diagnosis, at 3 months, at 6 months, and at 1 year
D) At diagnosis, when A1C is elevated, when medication changes, and at discharge
Rationale: ADA identifies four critical times for DSMES: (1) at diagnosis, (2) annually for
assessment and education updates, (3) when new complicating factors arise, and (4) during
transitions of care (hospitalization, new care setting, change in health status or life
circumstances).
10. What is the hallmark pathophysiology of type 1 diabetes?
A) Insulin resistance with relative insulin deficiency
, B) Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency
(correct answer)
C) Excess glucagon secretion from alpha cells
D) Impaired incretin effect from the gastrointestinal tract
Rationale: Type 1 diabetes results from autoimmune destruction of insulin-producing beta
cells in the pancreatic islets of Langerhans, leading to absolute insulin deficiency; persons
with type 1 diabetes require exogenous insulin for survival; autoantibodies (anti-GAD,
anti-insulin, anti-IA-2, anti-ZnT8) are markers of this process.
11. What is the primary defect in type 2 diabetes?
A) Autoimmune beta cell destruction
B) Combination of insulin resistance and progressive beta cell failure (correct answer)
C) Complete absence of insulin secretion
D) Overproduction of insulin by the pancreas
Rationale: Type 2 diabetes is characterized by a dual defect: insulin resistance (particularly
in muscle, liver, and adipose tissue) combined with progressive beta cell failure unable to
compensate for increased insulin demand; this leads to relative insulin deficiency and
hyperglycemia.
12. What is the Ominous Octet concept in type 2 diabetes pathophysiology?
A) Eight medications used to treat type 2 diabetes
B) Eight pathophysiological defects contributing to hyperglycemia in type 2 diabetes
including beta cell failure, alpha cell excess, muscle insulin resistance, liver glucose
overproduction, and others (correct answer)
C) Eight diagnostic criteria for type 2 diabetes
D) Eight complications of poorly controlled type 2 diabetes
Rationale: Ralph DeFronzo's "Ominous Octet" describes eight organs/mechanisms
contributing to type 2 diabetes hyperglycemia: beta cell failure, alpha cell dysfunction
(excess glucagon), muscle insulin resistance, hepatic glucose overproduction, decreased
incretin effect, increased lipolysis (adipocytes), renal glucose reabsorption (kidney), and
brain neurotransmitter dysfunction.
13. What autoantibodies are associated with type 1 diabetes?
A) Anti-nuclear antibody (ANA) and anti-dsDNA
