Medical Knowledge Diagnostic Procedures & Imaging 3

Question 1

Which blood test is the most sensitive initial screening test for thyroid function disorders?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Answer

TSH, secreted by the pituitary gland, is the most sensitive initial test for thyroid dysfunction because it rises in hypothyroidism and falls in hyperthyroidism before T3/T4 levels become abnormal.

Question 2

A lumbar puncture (spinal tap) is performed primarily to accomplish which diagnostic goal?

Accepted Answer

Obtain cerebrospinal fluid (CSF) for laboratory analysis

Answer

Lumbar puncture involves inserting a needle into the subarachnoid space to collect CSF, which is analyzed for infection, subarachnoid hemorrhage, or inflammatory neurological conditions.

Question 3

Diagnostic ultrasound imaging generates images using which physical principle?

Accepted Answer

High-frequency sound waves reflected from tissue interfaces

Answer

Ultrasound transmits high-frequency sound waves into the body; reflected echoes from tissue interfaces are processed to create real-time images of internal structures.

Question 4

Spirometry is a pulmonary function test used primarily to assess which parameters?

Accepted Answer

Lung volumes, capacities, and airflow rates during breathing

Answer

Spirometry measures how much air a patient can inhale and exhale and how quickly, providing key data to diagnose and monitor obstructive and restrictive lung diseases such as asthma and COPD.

Question 5

A blood culture is primarily ordered to detect which condition?

Accepted Answer

Presence of bacteria or fungi circulating in the bloodstream

Answer

Blood cultures involve incubating blood samples in enriched growth media to identify microorganisms causing bacteremia or fungemia, guiding targeted antimicrobial therapy.

Medical Knowledge Practice Test

Medical Knowledge Practice Test

Medical Knowledge Diagnostic Procedures & Imaging 3