Clinical Laboratory DX Exam 2 Practice
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About this Exam
Prepare with the Clinical Laboratory DX Exam 2 Practice practice quiz. This question bank includes 10 questions covering disease, elevated, item, listed, and cause. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.
Sample Questions
Question
1
Which item is listed as a cause of decreased BUN?
Explanation:
Blood urea nitrogen reflects how much urea the liver makes from ammonia during protein metabolism. When nitrogen balance is negative, the body is losing more nitrogen than it gains, so there’s less amino acid substrate available for deamination and urea formation. With less urea produced, the BUN level falls. This direct link between inadequate nitrogen intake and reduced urea synthesis makes negative nitrogen balance the best explanation for a decrease in BUN in a nutrition-focused context.
Question
2
ANA is sensitive for which disease?
Explanation:
Antinuclear antibodies are extremely sensitive for systemic lupus erythematosus; most patients with SLE have ANA detectable, which is why it’s used as a first screening test when lupus is suspected. A positive ANA strongly supports the possibility of SLE, although it’s not specific—many other autoimmune diseases and even some healthy people can have a positive result. Because of that, a positive ANA prompts follow-up testing with more disease-specific antibodies (like anti-dsDNA or anti-Smith) to confirm and refine the diagnosis. In the other conditions listed, ANA can be present but not as consistently or characteristically as in SLE, making systemic lupus erythematosus the disease for which ANA testing is most sensitive.
Question
3
Which item is listed as a cause of increased BUN in the third group?
Explanation:
BUN rises when the kidneys aren’t clearing urea effectively or when more urea is produced from protein breakdown. Sepsis fits this by commonly causing acute kidney injury from reduced blood flow and inflammatory damage, along with a hypercatabolic state that increases protein breakdown and urea production. This combination pushes BUN higher. While other conditions can influence BUN, sepsis is the scenario here that most consistently leads to an elevated BUN due to both impaired clearance and increased production.
Question
4
Ketones are the end product of which metabolic process?
Explanation:
Ketones are produced when fatty acids are broken down for energy, especially during fasting or low carbohydrate intake. In the liver, fatty acids undergo beta-oxidation to yield acetyl-CoA. If carbohydrate supply is limited, oxaloacetate is diverted to gluconeogenesis, restricting the entry of acetyl-CoA into the citric acid cycle. The excess acetyl-CoA is then used to form ketone bodies—acetoacetate, beta-hydroxybutyrate, and acetone—which are released into the bloodstream and used by tissues (like the brain and muscle) as an alternative energy source during prolonged fasting. Thus, the end products of fatty acid breakdown in this context are ketone bodies.
Question
5
An elevated TSI level is most closely associated with which disease?
Explanation:
Elevated thyroid-stimulating immunoglobulins (TSI) are autoantibodies that bind to and activate the TSH receptor on thyroid cells, mimicking TSH and driving increased production of thyroid hormones. This antibody pattern is most characteristic of Graves disease, where TSI cause diffuse, hyperfunctioning thyroid activity and are often linked with other Graves features like eye signs. In Hashimoto's thyroiditis, the immune system mainly produces anti-thyroid peroxidase and anti-thyroglobulin antibodies, leading to hypothyroidism rather than TSI-mediated hyperthyroidism. Subacute thyroiditis involves inflammatory destruction of the thyroid with release of preformed hormones, not stimulation via TSH receptors, so TSI are not elevated. Goiter simply denotes thyroid enlargement from various causes and does not specifically indicate elevated TSI.
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Clinical Laboratory DX Exam 2 Practice
This practice set contains 10 questions from the matching question bank and focuses on disease, elevated, item, listed, and cause. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.
This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.
Frequently Asked Questions
This quiz contains a total of 10 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.
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