A nurse in a health care provider’s office is reviewing lab results and notes a phenytoin level was drawn.
Which level would the nurse consider as therapeutic documentation?
9 mcg/mL
4 mcg/mL
24 mcg/mL
17 mcg/mL
The Correct Answer is D
According to web search results, the total phenytoin reference range for children and adults is **10-20 µg/mL**¹. This means that a level of 17 mcg/mL falls within the therapeutic range.
Option A is within the therapeutic range but is on the lower end.
Option B is below the therapeutic range.
Option C is above the therapeutic range and could be considered toxic.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A half-life is the time it takes for the concentration of a drug in the body to decrease by half. In this case, the medication has an 8-hour half-life, so after 8 hours, the concentration of the medication in the client's body would be reduced to 400mg (half of the initial dose of 800mg). After another 8 hours (16 hours total), the concentration would be reduced to 200mg. After another 8 hours (24 hours total), the concentration would be reduced to 100mg.
Correct Answer is A
Explanation
Donepezil is a medication used to treat Alzheimer's dementia. Its main mechanism of action is the inhibition of the acetylcholinesterase enzyme in the brain ¹. This increases the availability of acetylcholine at cholinergic synapses ⁵, which can improve cognition and function in clients with Alzheimer's dementia ¹.
Option B is incorrect because donepezil does not decrease acetylcholine in the periphery to increase movement.
Option C is incorrect because donepezil does not delay the transmission of acetylcholine at the neuronal junction.
Option D is incorrect because donepezil does not bind dopamine at neuron receptor sites to increase ability.
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