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ISCD Certified Bone Densitometry Technologist

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Exam Review

Key Facts: ISCD CCD Exam

100

Multiple-Choice Questions

ISCD CCD Handbook

75

Passing Score

ISCD

100 min

Test Duration

ISCD

$400

Full/Professional Member Initial Fee

ISCD

5 years

Certification Validity

ISCD

The CCD exam is delivered online through the ISCD Learning Center: 100 multiple-choice questions in 100 minutes, with a published passing score of 75. Initial fees are $400 for Full/Professional Members and $725 for Community/Non-Members. Approved candidates have a 90-day eligibility window; certification is valid for five years.

Sample ISCD CCD Practice Questions

Try these sample questions to review concepts for the ISCD CCD exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 106+ question experience with AI tutoring.

1Peak bone mass in the adult skeleton is typically achieved by which age range?
A.Late teens to mid-20s
B.Mid-30s
C.Age 40-45
D.Age 50 (women) and age 60 (men)
Explanation: Peak bone mass is typically reached by the late second to mid-third decade of life (roughly ages 18-25). Genetics determines 60-80% of peak bone mass; modifiable factors include nutrition, weight-bearing activity, and avoiding tobacco and excessive alcohol.
2Which cell type is primarily responsible for bone resorption?
A.Osteoblast
B.Osteocyte
C.Osteoclast
D.Chondrocyte
Explanation: Osteoclasts are large multinucleated cells of hematopoietic (monocyte-macrophage lineage) origin that resorb bone by acidifying the resorption pit and secreting cathepsin K and matrix metalloproteinases. RANKL signaling from osteoblasts drives osteoclast differentiation; denosumab is a monoclonal antibody to RANKL.
3Cortical bone comprises approximately what percentage of the adult skeleton?
A.20%
B.50%
C.80%
D.100%
Explanation: The adult skeleton is about 80% cortical (compact) bone and 20% trabecular (cancellous) bone. Cortical bone forms the outer shell of long bones; trabecular bone predominates in vertebral bodies, the ends of long bones, and the pelvis. Trabecular bone has higher metabolic turnover and responds first to bone-active therapies.
4RANKL produced by osteoblasts and stromal cells binds to RANK on osteoclast precursors. Which endogenous decoy receptor inhibits this interaction?
A.Osteoprotegerin (OPG)
B.Sclerostin
C.FGF23
D.Calcitonin
Explanation: Osteoprotegerin (OPG) is a decoy receptor secreted by osteoblasts that binds RANKL and prevents it from activating RANK on osteoclasts, suppressing osteoclastogenesis. The RANK/RANKL/OPG axis is central to bone remodeling; denosumab is a fully human monoclonal antibody that mimics OPG by binding RANKL.
5Which Wnt pathway inhibitor secreted by osteocytes is the target of romosozumab?
A.DKK-1
B.Sclerostin
C.Noggin
D.Periostin
Explanation: Sclerostin, encoded by SOST and produced predominantly by osteocytes, inhibits Wnt-beta-catenin signaling and suppresses bone formation. Romosozumab is a humanized monoclonal antibody to sclerostin that increases bone formation and decreases bone resorption, used for one year in postmenopausal women at high fracture risk.
6Which two minerals are the primary constituents of hydroxyapatite, the inorganic phase of bone?
A.Magnesium and potassium
B.Calcium and phosphate
C.Sodium and chloride
D.Zinc and copper
Explanation: Hydroxyapatite [Ca10(PO4)6(OH)2] is the dominant crystalline mineral in bone, providing compressive strength and serving as the body's reservoir of calcium and phosphate. Type I collagen forms the organic matrix that gives bone its tensile strength.
7Which is the most abundant non-collagenous protein in bone matrix and a marker of bone formation?
A.Osteocalcin
B.Albumin
C.Hemoglobin
D.Cytokeratin
Explanation: Osteocalcin (bone Gla protein) is produced by osteoblasts, is vitamin K dependent, and is the most abundant non-collagenous protein in bone. Serum osteocalcin and procollagen type 1 N-propeptide (P1NP) are formation markers; CTX and NTX are resorption markers.
8Which serum bone turnover marker is the preferred RESORPTION marker in clinical practice?
A.P1NP
B.Bone-specific alkaline phosphatase
C.Serum CTX (C-terminal telopeptide of type I collagen)
D.Osteocalcin
Explanation: Serum CTX is the preferred resorption marker; it should be drawn fasting in the morning to minimize variability. P1NP is the preferred formation marker. CTX falls quickly with potent antiresorptives (bisphosphonates, denosumab) and is sometimes used to confirm adherence.
9Calcitriol (1,25-dihydroxyvitamin D) is produced primarily by which enzyme and tissue?
A.25-hydroxylase in liver
B.1-alpha-hydroxylase in proximal renal tubule
C.24-hydroxylase in distal nephron
D.Aromatase in gonads
Explanation: 1-alpha-hydroxylase (CYP27B1) in the proximal renal tubule converts 25-hydroxyvitamin D to active calcitriol. PTH up-regulates this enzyme, while FGF23 and high phosphate suppress it. Renal failure and rare 1-alpha-hydroxylase mutations cause calcitriol deficiency despite normal 25-OH-D.
10Which laboratory test is the BEST single measure of vitamin D status?
A.Serum 1,25-dihydroxyvitamin D
B.Serum 25-hydroxyvitamin D
C.Urine vitamin D
D.Serum vitamin D-binding protein
Explanation: Serum 25-hydroxyvitamin D (25-OH-D) is the accepted measure of vitamin D body stores because of its long half-life (~3 weeks) and stable serum levels. The Endocrine Society defines deficiency as <20 ng/mL and insufficiency as 21-29 ng/mL; ISCD positions are aligned with maintaining adequate stores for bone health.

About the ISCD CCD Exam

Clinician credential for DXA interpretation, fracture risk assessment, and osteoporosis management. The CCD exam tests ISCD Official Positions, T-score and Z-score interpretation, FRAX, VFA, TBS, and treatment thresholds.

Exam sponsor: ISCD. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

100 multiple-choice questions through the ISCD Learning Center, online only. Access lasts 90 days after approval; once begun the 100-minute session cannot be paused.

Time Limit

1 hour 40 minutes

Passing Score

75 out of 100

Exam / Certification Fees

$400 Full/Professional Member; $725 Community/Non-Member

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

16%

Overview of Bone Physiology

Bone development, microarchitecture, remodeling, peak bone mass and fracture burden

20%

Imaging Technologies

Radiation physics and safety, DXA acquisition and artifacts, vertebral fracture assessment and radiographs

33%

Interpretation

Study quality, T-scores and Z-scores, BMD, least significant change, interpretation, reporting and special populations

16%

Risk Assessment

Fracture epidemiology, clinical and secondary risk factors, history, labs, imaging and FRAX

15%

Management

Lifestyle and fall prevention, osteoporosis medicines, DXA surveillance and patient education

Preparing for the ISCD CCD Exam

What You Need to Know

  • Passing score: 75 out of 100
  • Assessment: 100 multiple-choice questions through the ISCD Learning Center, online only. Access lasts 90 days after approval; once begun the 100-minute session cannot be paused.
  • Time limit: 1 hour 40 minutes
  • Exam / certification fees: $400 Full/Professional Member; $725 Community/Non-Member Official sources

Using Our Practice Resources

  • Work through all 106 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

ISCD CCD: Suggested Study Strategy

1Practice the adult ISCD rules for vertebra exclusion, selection of the lowest valid hip score, and indications for one-third radius DXA.
2For U.S. BHOF treatment decisions in postmenopausal women and men aged 50 or older with low bone mass at the femoral neck or total hip, learn the 10-year FRAX thresholds of at least 3% for hip or 20% for major osteoporotic fracture.
3For the adult ISCD VFA indication, check for a T-score below −1.0 plus one qualifying trigger, such as historical height loss over 4 cm or prednisone-equivalent therapy of at least 5 mg daily for at least three months.
4Apply 2023 ISCD TBS guidance for adults aged 40 or older. Use L1–L4 without exclusions when eligible, follow the manufacturer’s BMI range, and withhold TBS when severe structural or pathological artifact is present.
5For comparable BMD studies, use the site-specific facility least significant change. At 95% confidence, LSC equals 2.77 times precision error and a change of that magnitude or larger is statistically significant.

Frequently Asked Questions

What is the ISCD CCD exam format?

The Certified Clinical Densitometrist exam assesses clinicians who interpret bone densitometry. It has 100 multiple-choice questions and a 100-minute time limit. Approved candidates have 90 days to complete the exam through the ISCD Learning Center. Once started, the exam must be completed in one sitting.

What is the passing score for the CCD exam?

ISCD requires 75 correct answers out of 100, with one point per correct answer. The score report is available on completion, and the credential is valid for five years.

How much does the CCD exam cost?

The initial fee is $400 for Full or Professional Members and $725 for Community Members or nonmembers. Retest fees are $225 and $300 for the same membership tiers, respectively.

Who is eligible to take the CCD exam?

Clinicians who interpret bone densitometry, including licensed physicians, certified nurse practitioners, advanced practice registered nurses, certified physician assistants, fellows and residents. PhDs who research bone densitometry and current CCD certificants may also qualify. Licensed clinicians must be in good standing. A program director must confirm good standing for fellows and residents. The ISCD candidate guide specifies the documentation for each route.

When can I retake the CCD exam?

Wait 30 days after an unsuccessful attempt before submitting the retake application. ISCD permits up to three attempts within one year of the original failure. After three unsuccessful attempts, complete 12 additional hours of Category 1 CME or Category A CE in musculoskeletal health and bone densitometry after the last unsuccessful exam. Retest fees are $225 for Full or Professional Members and $300 for Community Members or nonmembers.

Where can I find the official CCD exam topics?

Use the five-domain content outline linked from ISCD’s CCD certification page. Interpretation accounts for 33 of 100 questions. For clinical rules, consult the 2023 ISCD Adult Official Positions and the applicable Pediatric and FRAX positions.

How long should I study for the CCD exam?

This independent study plan allocates 90 hours across the five domains, with the largest block for interpretation. Adjust the time to your experience interpreting DXA. ISCD’s Quality Bone Densitometry course is optional.