AAST REGISTRY EXAM COMPLETE STUDY
GUIDE WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS GRADED A+
Domain 1: Day Testing & Multiple Sleep Latency Test (MSLT)
Domain 2: Electrocardiogram (ECG) & Cardiovascular
Dynamics
Domain 3: Sleep Disordered Breathing (SDB)
Domain 4: Sleep Staging, Waveforms, & Parameters (SPWSP)
Domain 5: Advanced Technical Integration & Signal
Processing
Domain 6: Comprehensive Review & Differential Diagnosis
,Domain 1: Day Testing & Multiple Sleep Latency Test (MSLT)
Q1. During a Multiple Sleep Latency Test (MSLT), a patient
achieves sleep onset on nap 2 within 3 minutes but does not
exhibit REM sleep. On nap 3, sleep onset occurs at 4
minutes, and REM sleep is observed 9 minutes after the first
epoch of sleep. How should the technologist document the
REM latency for nap 3?
A) 4 minutes
B) 9 minutes
C) 13 minutes
D) REM latency cannot be calculated if sleep onset occurs before
5 minutes.
• Correct Answer: B
• Rationale: REM latency is defined as the elapsed time from
the very first epoch of sleep onset to the first epoch of REM
sleep. In this scenario, REM sleep occurred 9 minutes after
sleep onset, making 9 minutes the correct metric.
Q2. A patient undergoing an MSLT is suspected of having
narcolepsy. To fulfill the diagnostic criteria using this day
testing tool, what specific combination of findings must be
demonstrated across the series of naps?
A) A mean sleep latency of ≤ 8 minutes and at least one Sleep
Onset REM Period (SOREMP)
B) A mean sleep latency of ≤ 8 minutes and two or more
SOREMPs (including the preceding PSG)
, C) A mean sleep latency of ≤ 10 minutes and at least three
SOREMPs
D) A mean sleep latency of ≤ 5 minutes regardless of the
presence of REM sleep
• Correct Answer: B
• Rationale: According to clinical standards for sleep
disorders, a diagnosis of narcolepsy requires a mean sleep
latency of 8 minutes or less on the MSLT, along with at least
two SOREMPs across the entire test (a SOREMP on the
overnight PSG within 15 minutes of sleep onset can count as
one of these).
Q3. A technologist is preparing a patient for a five-nap MSLT
protocol. Nap 1 is scheduled to begin exactly how long after
the termination of the preceding overnight polysomnography
(PSG)?
A) 1.5 to 2 hours
B) 3 hours
C) 45 minutes to 1 hour
D) Exactly 60 minutes
• Correct Answer: A
• Rationale: Standard clinical guidelines dictate that the first
nap of the MSLT must begin between 1.5 and 2 hours after
the patient is woken up from the overnight diagnostic sleep
study to ensure standardized testing conditions.
GUIDE WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS GRADED A+
Domain 1: Day Testing & Multiple Sleep Latency Test (MSLT)
Domain 2: Electrocardiogram (ECG) & Cardiovascular
Dynamics
Domain 3: Sleep Disordered Breathing (SDB)
Domain 4: Sleep Staging, Waveforms, & Parameters (SPWSP)
Domain 5: Advanced Technical Integration & Signal
Processing
Domain 6: Comprehensive Review & Differential Diagnosis
,Domain 1: Day Testing & Multiple Sleep Latency Test (MSLT)
Q1. During a Multiple Sleep Latency Test (MSLT), a patient
achieves sleep onset on nap 2 within 3 minutes but does not
exhibit REM sleep. On nap 3, sleep onset occurs at 4
minutes, and REM sleep is observed 9 minutes after the first
epoch of sleep. How should the technologist document the
REM latency for nap 3?
A) 4 minutes
B) 9 minutes
C) 13 minutes
D) REM latency cannot be calculated if sleep onset occurs before
5 minutes.
• Correct Answer: B
• Rationale: REM latency is defined as the elapsed time from
the very first epoch of sleep onset to the first epoch of REM
sleep. In this scenario, REM sleep occurred 9 minutes after
sleep onset, making 9 minutes the correct metric.
Q2. A patient undergoing an MSLT is suspected of having
narcolepsy. To fulfill the diagnostic criteria using this day
testing tool, what specific combination of findings must be
demonstrated across the series of naps?
A) A mean sleep latency of ≤ 8 minutes and at least one Sleep
Onset REM Period (SOREMP)
B) A mean sleep latency of ≤ 8 minutes and two or more
SOREMPs (including the preceding PSG)
, C) A mean sleep latency of ≤ 10 minutes and at least three
SOREMPs
D) A mean sleep latency of ≤ 5 minutes regardless of the
presence of REM sleep
• Correct Answer: B
• Rationale: According to clinical standards for sleep
disorders, a diagnosis of narcolepsy requires a mean sleep
latency of 8 minutes or less on the MSLT, along with at least
two SOREMPs across the entire test (a SOREMP on the
overnight PSG within 15 minutes of sleep onset can count as
one of these).
Q3. A technologist is preparing a patient for a five-nap MSLT
protocol. Nap 1 is scheduled to begin exactly how long after
the termination of the preceding overnight polysomnography
(PSG)?
A) 1.5 to 2 hours
B) 3 hours
C) 45 minutes to 1 hour
D) Exactly 60 minutes
• Correct Answer: A
• Rationale: Standard clinical guidelines dictate that the first
nap of the MSLT must begin between 1.5 and 2 hours after
the patient is woken up from the overnight diagnostic sleep
study to ensure standardized testing conditions.
