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DOH Bone (DOH-BONE) Practice Tests & Test Prep by Exam Edge - Topics


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Understanding what is on the DOH Bone exam is crucial step in preparing for the exam. You will need to have an understanding of the testing domain (topics covered) to be sure you are studing the correct information.

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DOH Bone Densitometry Exam Blueprint

Understanding the exact breakdown of the DOH Bone Densitometry test will help you know what to expect and how to most effectively prepare. The DOH Bone Densitometry has multiple-choice questions The exam will be broken down into the sections below:

DOH Bone Densitometry Exam Blueprint
Domain Name
Osteoporosis and Bone Health
Equipment Operation and Quality Control
Patient Preparation and Safety
DXA Scanning of Lumbar Spine
DXA Scanning of Forearm
DXA Scanning of Proximal Femur

DOH Bone Densitometry - Exam Topics Sample Questions

The bone remodeling cycle is initiated by what?

Correct Answer:
osteocyctes. 


the bone remodeling cycle is critical to maintaining the structural integrity and health of bones. it is a dynamic process that involves the coordinated actions of three primary types of bone cells: osteocytes, osteoclasts, and osteoblasts. each of these cells plays a unique and vital role in the remodeling process, ensuring the replacement of old bone tissue with new bone tissue to maintain bone strength and mineral homeostasis.

osteocytes, the most abundant type of bone cells, are primarily responsible for initiating the bone remodeling cycle. these cells are mature bone cells that originate from osteoblasts and are embedded within the bone matrix. osteocytes act as mechanosensors, detecting changes in mechanical stress or damage to the bone. when such changes are detected, osteocytes can signal the need for bone remodeling.

upon receiving signals from osteocytes, osteoclasts are recruited to the site of remodeling. osteoclasts are large, multinucleated cells that specialize in resorbing, or breaking down, bone tissue. this resorption is a critical phase in the remodeling cycle, as it helps to remove old or damaged bone. osteoclasts achieve this through the secretion of acids and enzymes that dissolve the mineral matrix and collagen fibers of the bone.

following the phase of bone resorption by osteoclasts, osteoblasts are then recruited to the same site to begin the bone formation phase. osteoblasts are cells that synthesize new bone matrix, depositing minerals to form new bone tissue. this not only compensates for the bone loss caused by osteoclasts but also ensures the renewal and ongoing health of the bone.

the entire process is tightly regulated by interactions among osteocytes, osteoclasts, and osteoblasts, with osteocytes playing the initiating role. this regulatory system ensures that bone remodeling can respond adequately to mechanical demands and repair needs, thereby maintaining overall skeletal strength and functionality. the importance of osteocytes in initiating this cycle highlights their role not just as structural components of bone, but as key regulators of bone metabolism and health.

How are patients positioned for DXA scans of the forearm?

Correct Answer:
the patient is positioned next to the machine.


patient positioning is crucial for accurate dual-energy x-ray absorptiometry (dxa) scans of the forearm. proper positioning ensures that the scan captures the best possible image quality and delivers accurate bone density measurements. the process begins with the patient being seated next to the dxa machine. this proximity allows for easy access and adjustment during the scanning procedure.

for the forearm scan specifically, the patient's forearm is placed on a platform, typically a perspex board or a plastic support aid. this platform helps stabilize the arm and ensure it remains immobile during the scan. to further restrict movement, the arm is usually secured with straps. it is essential that the forearm is correctly aligned along the length of the scanner to ensure that the images are clear and properly calibrated.

the positioning of the forearm involves meticulous placement with respect to the machine's scanning field. the forearm measurement in a dxa scan typically extends from the ulnar styloid process (near the wrist) to the tip of the elbow. during positioning, the patient's elbow joint is flexed, and the palm is turned downwards. this orientation aligns the bones in a manner optimal for scanning. the base of the thumb should be placed approximately 1cm below the top edge of the scanning area to maintain consistent positioning.

to align the forearm correctly with the shoulder, the patient is asked to lean forward slightly. this adjustment ensures that the shoulder and the forearm are in a straight line, which is crucial for the scanner to capture the entire length of the forearm accurately. such alignment helps in reducing scan errors and provides a precise measurement of bone density along the forearm.

overall, proper patient positioning for a dxa forearm scan is a systematic process that requires attention to detail to ensure the accuracy and reliability of the scan results. by following these precise positioning guidelines, clinicians can obtain dependable data necessary for diagnosing and monitoring conditions related to bone density.