100+ Free ISCD CCD Practice Questions

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Peak bone mass in the adult skeleton is typically achieved by which age range?

Late teens to mid-20s

Mid-30s

Age 40-45

Age 50 (women) and age 60 (men)

to track

2026 Statistics

Key Facts: ISCD CCD Exam

100

Multiple-Choice Questions

ISCD CCD Handbook

75/100

Passing Score

ISCD

100 min

Test Duration

ISCD

$300

Member Exam Fee

ISCD

5 years

Certification Validity

ISCD

1,409

Active CCD Professionals

ISCD Certification Registry

The ISCD Certified Clinical Densitometrist (CCD) exam is a 100-question, 100-minute online proctored test for clinicians (physicians, NPs, PAs, fellows, PhDs) who interpret bone density scans. You need 75/100 correct to pass. Fees are $300 for ISCD members and $625 for non-members. Certification is valid for 5 years. The 2023 ISCD Official Positions on TBS, follow-up BMD testing, and DXA reporting are heavily tested.

Sample ISCD CCD Practice Questions

Try these sample questions to test your ISCD CCD exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ 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.

Questions

100 scored questions

Time Limit

1 hour 40 minutes

Passing Score

75/100 (75%)

Exam Fee

$300 member / $625 non-member (ISCD)

ISCD CCD Exam Content Outline

16%

Overview of Bone Physiology

Bone development, structure, peak bone mass, remodeling, and bone biomarkers

18%

Imaging Technologies

DXA principles, QCT, pQCT, QUS, radiation safety, and quality control

35%

Interpretation

T-scores, Z-scores, BMD, LSC, ROI selection, VFA, TBS, reporting per ISCD Official Positions

16%

Risk Assessment

Epidemiology, risk factors, FRAX, secondary causes of bone loss, clinical evaluation

15%

Management

Lifestyle, calcium and vitamin D, bisphosphonates, denosumab, romosozumab, anabolics, and monitoring

How to Pass the ISCD CCD Exam

What You Need to Know

Passing score: 75/100 (75%)
Exam length: 100 questions
Time limit: 1 hour 40 minutes
Exam fee: $300 member / $625 non-member

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ISCD CCD Study Tips from Top Performers

1Memorize ISCD interpretation rules — when to exclude vertebrae, total hip vs femoral neck choice, and forearm 33% radius use

2Master FRAX treatment thresholds: NOF/Bone Health & Osteoporosis Foundation US thresholds are >=3% 10-year hip and >=20% major osteoporotic fracture risk

3Know VFA indications: T-score <-1.0 plus age, height loss, undocumented fracture, or chronic glucocorticoid use

4Learn the 2023 TBS positions: appropriate for adults >=40 years, use L1-L4 without exclusions, do not report with severe artifact

5Practice LSC math — change in BMD must exceed 2.77 x precision error to be significant

Frequently Asked Questions

What is the ISCD CCD exam?

The Certified Clinical Densitometrist (CCD) exam is the ISCD's NCCA-accredited credential for clinicians who interpret bone densitometry. It is open to physicians, certified nurse practitioners, certified physician assistants, fellows, residents, and PhDs. The exam covers ISCD Official Positions, DXA interpretation, fracture risk assessment, and osteoporosis management.

How many questions are on the CCD exam and how long is it?

The CCD exam has 100 multiple-choice questions and you have 100 minutes (1 hour 40 minutes) to complete it. Each correct answer is worth 1 point and there is no penalty for wrong answers, so you should answer every question. As of 2025, the CCD exam is delivered online through the ISCD Learning platform.

What is the passing score for the CCD exam?

You need 75 out of 100 correct (75%) to pass the ISCD CCD exam. Results are typically released within 1-2 weeks after the close of the testing window. Newly certified professionals appear on the ISCD certification registry, and the credential is valid for 5 years.

How much does the CCD exam cost?

The CCD exam fee is $300 for ISCD Professional or Full Members and $625 for Community Members or Non-Members (2025 rates). ISCD membership starts at $200 annually and provides access to journals, ACCME credit, and exam discounts that often offset membership costs for first-time test-takers.

Who is eligible to take the CCD exam?

CCD certification is open to clinicians who interpret bone densitometry: licensed physicians (MD, DO, or international equivalent), certified nurse practitioners, certified physician assistants, fellows, residents, and non-licensed medical practitioners with a PhD in a relevant field. Candidates must be in good standing in their licensure or training program.

What ISCD Official Positions are tested on the CCD exam?

The exam tests the most current ISCD Official Positions. Key 2023 updates include the use of L1-L4 for Trabecular Bone Score (TBS) without exclusions, follow-up BMD testing intervals tied to predefined objectives, and revised DXA reporting requirements. The 2019 Adult, Pediatric, and FRAX Positions remain in scope along with the 2023 revisions.

How should I study for the CCD exam?

ISCD recommends taking the Quality Bone Densitometry for Clinicians course, reading the current ISCD Adult, Pediatric, and FRAX Official Positions, and reviewing the Journal of Clinical Densitometry. Practice questions are critical for mastering interpretation rules (T-score vs Z-score, ROI selection, VFA indications, TBS reporting). Plan 60-100 hours of focused study over 8-12 weeks.