Barkley Psychiatric-Mental Health Nurse Practitioner
(PMHNP) Diagnostic Readiness Test (DRT) | 100 Actual
Practice Questions and Verified Answers
Question 1
A PMHNP is explaining to a patient how selective serotonin reuptake
inhibitors (SSRIs) exert their therapeutic effect. Which of the following
best describes the initial mechanism of action?
A) Inhibition of monoamine oxidase enzymes
B) Blockade of postsynaptic serotonin receptors
C) Inhibition of presynaptic serotonin reuptake transporters (SERT)
D) Direct agonism at 5-HT1A receptors
Answer: C) Inhibition of presynaptic serotonin reuptake
transporters (SERT)
Explanation: SSRIs bind to and block the serotonin transporter
(SERT) on the presynaptic neuron, preventing reuptake of serotonin
from the synaptic cleft. This increases synaptic serotonin
availability. Clinical effects are delayed due to downstream receptor
adaptations. Option A describes MAOIs; B describes antagonists
(e.g., some antipsychotics); D describes buspirone.
,Question 2
The mesolimbic dopamine pathway, when hyperactive, is most closely
associated with which symptoms of schizophrenia?
A) Negative symptoms (avolition, anhedonia)
B) Positive symptoms (hallucinations, delusions)
C) Cognitive symptoms (impaired working memory)
D) Affective symptoms (depression, anxiety)
Answer: B) Positive symptoms (hallucinations, delusions)
Explanation: Hyperactivity in the mesolimbic pathway (VTA to
nucleus accumbens) is linked to positive psychotic symptoms.
Hypoactivity in the mesocortical pathway is associated with negative
and cognitive symptoms.
Question 3
A patient with generalized anxiety disorder has been on an SSRI for 8
weeks with partial response. The PMHNP considers augmentation with
buspirone. Buspirone's primary mechanism is:
A) GABA-A receptor positive allosteric modulation
B) Serotonin 5-HT1A receptor partial agonism
C) Dopamine D2 receptor antagonism
D) Norepinephrine reuptake inhibition
Answer: B) Serotonin 5-HT1A receptor partial agonism
Explanation: Buspirone is a 5-HT1A partial agonist. It lacks
,GABAergic activity, dependence potential, or significant sedation. It
is not a D2 antagonist or NRI.
Question 4
Which of the following laboratory tests is essential to monitor in a patient
initiated on clozapine?
A) Liver function tests weekly
B) Absolute neutrophil count (ANC) weekly for 6 months, then every 2
weeks, then monthly
C) Serum creatinine and BUN every 3 months
D) Thyroid stimulating hormone (TSH) every 6 months
Answer: B) Absolute neutrophil count (ANC) weekly for 6 months,
then every 2 weeks, then monthly
Explanation: Clozapine carries a risk of agranulocytosis. The REMS
program requires ANC monitoring: weekly for the first 6 months,
every 2 weeks for the next 6 months, then monthly thereafter. LFTs,
renal function, and thyroid are not specific to clozapine REMS
(though clozapine can affect metabolic parameters).
Question 5
The therapeutic serum level range for lithium in the maintenance
treatment of bipolar disorder is typically:
A) 0.2–0.4 mEq/L
, B) 0.6–1.2 mEq/L
C) 1.5–2.0 mEq/L
D) 2.5–3.5 mEq/L
Answer: B) 0.6–1.2 mEq/L
Explanation: The therapeutic maintenance range is 0.6–1.2 mEq/L,
with levels of 0.8–1.0 often targeted. Acute mania may require the
higher end (1.0–1.2). Toxicity generally begins above 1.5 mEq/L.
Question 6
Which neurotransmitter system is primarily targeted by varenicline, a
medication used for smoking cessation?
A) Dopamine D2 receptors
B) Nicotinic acetylcholine receptors (partial agonist)
C) Opioid mu receptors
D) Cannabinoid CB1 receptors
Answer: B) Nicotinic acetylcholine receptors (partial agonist)
Explanation: Varenicline is a partial agonist at alpha4beta2 nicotinic
acetylcholine receptors. It reduces cravings and withdrawal
symptoms while blocking the rewarding effects of nicotine.
Question 7
Which of the following antidepressants has the highest risk of
discontinuation syndrome due to its short half-life and lack of active
(PMHNP) Diagnostic Readiness Test (DRT) | 100 Actual
Practice Questions and Verified Answers
Question 1
A PMHNP is explaining to a patient how selective serotonin reuptake
inhibitors (SSRIs) exert their therapeutic effect. Which of the following
best describes the initial mechanism of action?
A) Inhibition of monoamine oxidase enzymes
B) Blockade of postsynaptic serotonin receptors
C) Inhibition of presynaptic serotonin reuptake transporters (SERT)
D) Direct agonism at 5-HT1A receptors
Answer: C) Inhibition of presynaptic serotonin reuptake
transporters (SERT)
Explanation: SSRIs bind to and block the serotonin transporter
(SERT) on the presynaptic neuron, preventing reuptake of serotonin
from the synaptic cleft. This increases synaptic serotonin
availability. Clinical effects are delayed due to downstream receptor
adaptations. Option A describes MAOIs; B describes antagonists
(e.g., some antipsychotics); D describes buspirone.
,Question 2
The mesolimbic dopamine pathway, when hyperactive, is most closely
associated with which symptoms of schizophrenia?
A) Negative symptoms (avolition, anhedonia)
B) Positive symptoms (hallucinations, delusions)
C) Cognitive symptoms (impaired working memory)
D) Affective symptoms (depression, anxiety)
Answer: B) Positive symptoms (hallucinations, delusions)
Explanation: Hyperactivity in the mesolimbic pathway (VTA to
nucleus accumbens) is linked to positive psychotic symptoms.
Hypoactivity in the mesocortical pathway is associated with negative
and cognitive symptoms.
Question 3
A patient with generalized anxiety disorder has been on an SSRI for 8
weeks with partial response. The PMHNP considers augmentation with
buspirone. Buspirone's primary mechanism is:
A) GABA-A receptor positive allosteric modulation
B) Serotonin 5-HT1A receptor partial agonism
C) Dopamine D2 receptor antagonism
D) Norepinephrine reuptake inhibition
Answer: B) Serotonin 5-HT1A receptor partial agonism
Explanation: Buspirone is a 5-HT1A partial agonist. It lacks
,GABAergic activity, dependence potential, or significant sedation. It
is not a D2 antagonist or NRI.
Question 4
Which of the following laboratory tests is essential to monitor in a patient
initiated on clozapine?
A) Liver function tests weekly
B) Absolute neutrophil count (ANC) weekly for 6 months, then every 2
weeks, then monthly
C) Serum creatinine and BUN every 3 months
D) Thyroid stimulating hormone (TSH) every 6 months
Answer: B) Absolute neutrophil count (ANC) weekly for 6 months,
then every 2 weeks, then monthly
Explanation: Clozapine carries a risk of agranulocytosis. The REMS
program requires ANC monitoring: weekly for the first 6 months,
every 2 weeks for the next 6 months, then monthly thereafter. LFTs,
renal function, and thyroid are not specific to clozapine REMS
(though clozapine can affect metabolic parameters).
Question 5
The therapeutic serum level range for lithium in the maintenance
treatment of bipolar disorder is typically:
A) 0.2–0.4 mEq/L
, B) 0.6–1.2 mEq/L
C) 1.5–2.0 mEq/L
D) 2.5–3.5 mEq/L
Answer: B) 0.6–1.2 mEq/L
Explanation: The therapeutic maintenance range is 0.6–1.2 mEq/L,
with levels of 0.8–1.0 often targeted. Acute mania may require the
higher end (1.0–1.2). Toxicity generally begins above 1.5 mEq/L.
Question 6
Which neurotransmitter system is primarily targeted by varenicline, a
medication used for smoking cessation?
A) Dopamine D2 receptors
B) Nicotinic acetylcholine receptors (partial agonist)
C) Opioid mu receptors
D) Cannabinoid CB1 receptors
Answer: B) Nicotinic acetylcholine receptors (partial agonist)
Explanation: Varenicline is a partial agonist at alpha4beta2 nicotinic
acetylcholine receptors. It reduces cravings and withdrawal
symptoms while blocking the rewarding effects of nicotine.
Question 7
Which of the following antidepressants has the highest risk of
discontinuation syndrome due to its short half-life and lack of active
