- The Sleep Disorders Specialist exam from the NBRC has 180 multiple-choice items: 160 scored plus 20 pretest, in 240 minutes.
- Study Analysis is the heaviest domain at 53 of 160 scored items, so scoring and reporting skills matter most.
- Sleep Disorders Testing (37 items) is dominated by therapeutic interventions during testing, worth 28 scored items.
- Administrative Functions has only 8 scored items, but its objectives are among the most concrete and memorizable.
How the NBRC Blueprint Is Built
The Sleep Disorders Specialist credential (CRT-SDS/RRT-SDS) is issued by the National Board for Respiratory Care (NBRC). Its exam is organized around a Detailed Content Outline (DCO) that breaks the profession into five domains, fourteen subdomains, 66 numbered objectives, and 77 lettered subpoints. The version currently in force took effect in September 2023, and you can read it directly on the NBRC's SDS program page or through the current content outlines listing.
The exam delivers 180 multiple-choice questions in 240 minutes. Of those, 160 are scored and 20 are pretest items that do not count toward your result. You cannot tell which are which, so every question deserves full effort. That works out to roughly 80 seconds per question across the whole session, which is generous for recall items and tight for multi-step scoring or statistics-verification items.
One point worth stating clearly: the NBRC publishes scored item counts per domain, not percentage labels. Anything you see quoted as a "percentage weight" is a derived figure, so this guide sticks to the official counts. For fees, the exact passing cut score, and maintenance requirements, check the issuer directly or see our companion articles on SDS certification cost and the SDS passing score.
Domain Weights at a Glance
| Domain | Scored Items (of 160) | Subdomains |
|---|---|---|
| 1. Pre-Testing | 29 | Identification and Care of At-Risk Individuals (12); Study Preparations (17) |
| 2. Sleep Disorders Testing | 37 | Signal Maintenance During Testing (4); Therapeutic Interventions During Testing (28); Study Conclusion (5) |
| 3. Study Analysis | 53 | Record Review (2); Sleep Staging (8); Sleep Event Identification (27); Sleep Event Reporting (16) |
| 4. Administrative Functions | 8 | Data and Equipment Maintenance (4); Management (4) |
| 5. Treatment Plan | 33 | Development (9); Implementation (9); Evaluation (15) |
Two patterns jump out. First, Domains 2 and 3 together account for 90 of 160 scored items, more than half the exam. Second, within those domains, a handful of subdomains carry disproportionate weight: Therapeutic Interventions During Testing (28), Sleep Event Identification (27), and Sleep Event Reporting (16). If you only have limited study hours, those three subdomains plus Study Preparations (17) and Evaluation (15) cover 103 scored items.
Domain 1: Pre-Testing (29 Scored Items)
Pre-Testing covers everything that happens before the first electrode touches a patient. It splits into two subdomains, and the second one is the larger.
I.A Identification and Care of At-Risk Individuals (12 items)
This subdomain tests whether you can recognize who needs testing and which test fits them.
- Recognizing sleep disorder signs and symptoms from history, interview, or clinical assessment in outpatient, perioperative, and inpatient settings.
- Identifying special factors such as cultural background, gender identity, primary language, disabilities, and co-morbid conditions.
- Matching the diagnostic modality to patient factors, co-morbidities, and insurance requirements. The outline names six: polysomnography (with or without therapeutic intervention), home sleep apnea testing, the Multiple Sleep Latency Test (MSLT), the Maintenance of Wakefulness Test (MWT), actigraphy, and overnight oximetry.
- Communicating diagnostic and therapeutic findings and recommendations to the health care team.
Expect scenario questions here: a patient profile, a clinical question, and four possible testing choices. Knowing the intended use of each modality is the entire skill. MSLT and MWT, for example, address daytime sleepiness and alertness rather than nocturnal breathing, while overnight oximetry and home testing serve different diagnostic roles than attended polysomnography.
I.B Study Preparations (17 items)
The largest Pre-Testing subdomain, with 14 numbered objectives that read like a technologist's setup checklist.
- Pulling critical information from the medical record and selecting the correct study montage.
- Setting up equipment and evaluating calibrations for accuracy and linearity of amplified signals.
- Confirming adequate audiovisual signals and recommending modifications to the prescriber's order when needed.
- Assessing current clinical condition, explaining procedures, and obtaining informed consent from the patient or caregiver.
- Documenting medications and identifying those that may affect test results.
- Applying electrodes and sensors to capture airflow, snoring, body position, ECG, respiratory effort, EEG, leg movements, eye movements, chin EMG, and SpO2, plus exhaled CO2 and transcutaneous CO2 where indicated.
- Documenting signal quality, including electrode impedances and physiologic calibration results.
Sensor placement and calibration questions reward hands-on familiarity. If you have not set up a full montage recently, review the channel-by-channel purpose of each sensor, since questions often ask what a specific signal problem implies about placement or equipment.
Domain 2: Sleep Disorders Testing (37 Scored Items)
Domain 2 is the in-lab, overnight portion of the job. One subdomain overwhelmingly dominates it.
II.A Signal Maintenance During Testing (4 items)
Three objectives: recognize inadequate signals or artifacts, correct them as appropriate, and document the corrections. Few questions, but they are among the most answerable if you know your artifact patterns and the standard first-line fixes.
II.B Therapeutic Interventions During Testing (28 items)
What this subdomain demands
This is the clinical core of the exam, and it spans recognition, treatment initiation, titration, patient coaching, emergencies, and documentation.
- Recognize disorders across sleep, cardiac, neurological, pulmonary, and gastrointestinal categories (including GI findings such as pH and distention).
- Start therapy: PAP (continuous, auto, bilevel), other non-invasive therapy such as Adaptive Servo Ventilation and Average Volume-Assured Pressure Support, oxygen, and a mandibular advancement device such as a disposable oral appliance.
- Optimize therapy based on patient response, including PAP, ASV/AVAPS, oxygen, permanent oral appliance, mandibular advancement device, and patient positioning.
- Coach the patient in cooperative behaviors while adjusting therapy.
- Recognize and respond to medical emergencies such as seizures, stroke, and respiratory distress, with interventions differing between in-hospital and freestanding sleep centers.
- Respond to unsafe environments such as a combative patient or family member, fire, or earthquake.
- Document event times: artifacts, recording abnormalities, therapeutic adjustments, parasomnias, lights off/on, and staff entering the room.
Notice the in-hospital versus freestanding distinction in the emergency objective. Your response options, available support, and escalation paths differ by setting, and the exam expects you to know the difference. Titration questions typically present a recorded event pattern and ask what adjustment is appropriate, so practice reasoning from the evidence to the intervention rather than memorizing settings in isolation.
II.C Study Conclusion (5 items)
Post-study calibrations, equipment removal, reviewing the post-study questionnaire, describing the post-study process to the patient or caregiver, and summarizing observations for analysis. Straightforward procedural content that is worth locking down because the question count is small but predictable.
Domain 3: Study Analysis (53 Scored Items)
This is the heaviest domain by a wide margin, representing roughly a third of all scored items. It rewards precision and a methodical approach more than any other part of the exam. If you are weighing how demanding the credential is overall, see our breakdown in How Hard Is the SDS Exam?
III.A Record Review (2 items)
Identify critical information from the medical history (medications, co-morbid conditions) and review the summary of study observations and patient questionnaires. Tiny in item count, but it sets up the interpretation context for everything else in the domain.
III.B Sleep Staging (8 items)
Score sleep stages for adult patients and for pediatric patients. The outline lists these as two separate objectives, which signals that pediatric scoring rules are tested distinctly. Do not assume adult criteria transfer.
III.C Sleep Event Identification (27 items)
Recognizing events from in-lab testing
Seven event categories, each of which can appear as a tracing-based question.
- Sleep-disordered breathing
- Abnormal limb movements
- Abnormal cardiac rhythm
- Abnormal EEG waveforms (for example, seizure activity or voltage changes)
- Parasomnias (for example, night terrors and REM behavior disorder)
- Arousals
- Abnormal CO2 levels or hypoventilation
Evaluating home sleep apnea testing data
A separate objective with five elements that candidates often underprepare for.
- Validity of the recording
- Sleep-disordered breathing events
- Oximetry
- Artifacts
- Cardiac rhythm
The home testing objective starts with validity. Before you interpret events from a portable recording, you must be able to judge whether the data are usable at all. That is a distinct skill from scoring a full in-lab study and deserves its own review block.
III.D Sleep Event Reporting (16 items)
This subdomain is where the exam gets quantitative. It asks you to verify statistics, indices, and counts, and to produce a valid report.
Statistics you must be able to verify
The outline lists specific generated values to check.
- Oxygen saturation, sleep latency, REM latency, sleep efficiency, total sleep time, total time in bed, total recording time, sleep stage percentages, and wake after sleep onset.
- For MSLT and MWT: mean sleep latency and REM periods.
- Event frequencies: obstructive, central, and mixed apneas; obstructive and central hypopneas; arousals; abnormal limb movements; snoring; RERAs; Cheyne-Stokes respirations; sleep-related hypoventilation; periodic breathing; and CO2 levels.
- Indices for apneas, hypopneas, RERAs, respiratory events from portable monitors, arousals, abnormal limb movements, and desaturations.
- Abnormalities in EEG (spike wave, alpha-delta, alpha-intrusion), REM (density, latency), and ECG activity.
- A valid written report including both objective and subjective information.
Domain 4: Administrative Functions (8 Scored Items)
The smallest domain, split evenly into two subdomains of four items each. It is easy to dismiss, but eight items is not nothing on an exam where every point counts, and the content is far more memorizable than scoring or titration.
IV.A Data and Equipment Maintenance (4 items)
- Store each patient's information according to government and industry standards.
- Correct problems with data acquisition and recording equipment.
- Satisfy requirements, including performing and documenting biomedical equipment quality control, routine equipment processing, and inventory maintenance.
IV.B Management (4 items)
- Implement policies and procedures such as secure data archiving, patient confidentiality, and safety.
- Implement quality improvement programs such as patient satisfaction measurement and inter-scorer reliability.
Inter-scorer reliability is a particularly testable concept because it ties directly back to Domain 3. If you understand why labs measure agreement between scorers, you will also understand why scoring consistency matters on the exam itself.
Domain 5: Treatment Plan (33 Scored Items)
Domain 5 moves from the night of the study to long-term patient management. It has three subdomains with 9, 9, and 15 scored items.
V.A Development (9 items)
- Assess patient or caregiver needs and barriers to optimal therapy, including educational level, cultural and gender identity factors, disabilities, and insurance requirements.
- Select equipment and interface to maximize adherence and efficacy.
- Communicate assessment details to the health care team.
- Assist in developing an individualized treatment plan, including behavior modifications and co-morbid condition management.
V.B Implementation (9 items)
- Assist in generating the prescription.
- Educate the patient or caregiver about the therapeutic plan.
- Adjust equipment settings to comply with the prescription.
- Document educational assessments, interventions, and the patient's or caregiver's comprehension of the plan.
V.C Evaluation (15 items)
- Analyze PAP data downloads.
- Evaluate mask fit.
- Analyze results from follow-up studies: nocturnal oximetry, repeated home sleep testing, and actigraphy.
- Document treatment outcomes.
- Communicate results and recommended revisions to the healthcare provider.
Evaluation is the standout here. Reading a PAP download and deciding whether the problem is mask leak, residual events, or poor usage is a high-value, high-frequency skill in clinical practice, and the exam reflects that. Pair it with mask fit evaluation, since leak patterns and fit problems are closely linked. For context on how these responsibilities translate into employment, see our guides to SDS jobs and the SDS salary guide.
Sequencing Your Prep by Domain
Rather than generic study advice, here is a domain-driven sequence that follows the item counts and the way the skills build on each other. For a fuller plan, read our SDS study guide, and use the SDS cheat sheet for final review.
Pre-Testing and Administrative Functions
- Memorize the six diagnostic modalities and when each applies.
- Work through the full sensor and montage list in I.B.12 and I.B.13.
- Cover Domain 4 in short sessions; it is compact and quick to lock in.
Sleep Disorders Testing
- Concentrate on II.B: therapy initiation, titration logic, and emergency response by facility type.
- Drill artifact recognition and correction for II.A.
Study Analysis
- Spend the most time here: 53 of 160 scored items.
- Practice adult and pediatric staging separately, then event identification across all seven categories, then home sleep test validity.
- Recompute statistics by hand until relationships between time metrics are automatic.
Treatment Plan and Full Review
- Focus on PAP download analysis, mask fit, and follow-up study interpretation.
- Finish with timed mixed practice using the SDS practice tests.
Why this order? Domains 1 and 4 are foundational and quick, Domain 2 builds the clinical judgment you will need, and Domain 3 gets the longest runway because it is both the largest and the most skill-dependent. Treatment Plan comes last because it draws on everything before it. Adjust the timing around your own experience: working technologists may compress Domain 2, while newer candidates may need extra time there.
Before you commit to a schedule, confirm that you qualify. Our SDS requirements article covers eligibility, and SDS exam dates covers scheduling. If you are still deciding whether to pursue the credential, Is the SDS Certification Worth It? walks through the value proposition. When you are ready to test yourself against realistic question styles, start with a full-length SDS practice exam.
Key Takeaway
Use the official DCO as your checklist. For every numbered objective, ask whether you could answer a scenario question on it. Mark the ones where you hesitate, and weight your review toward Study Analysis, Therapeutic Interventions During Testing, and Evaluation, where the item counts are highest.
Frequently Asked Questions
Five: Pre-Testing, Sleep Disorders Testing, Study Analysis, Administrative Functions, and Treatment Plan. Together they contain 160 scored items (29, 37, 53, 8, and 33 respectively), plus 20 unscored pretest items for a total of 180 questions.
Study Analysis, with 53 of 160 scored items. Within it, Sleep Event Identification (27 items) and Sleep Event Reporting (16 items) are the biggest subdomains, so scoring, event recognition, and statistics verification deserve the most study time.
Yes. Home sleep apnea testing appears as a diagnostic modality in Pre-Testing and as a dedicated data-evaluation objective in Study Analysis, covering validity, sleep-disordered breathing, oximetry, artifacts, and cardiac rhythm. It also reappears in Treatment Plan as a possible follow-up study.
No. The 20 pretest items are mixed in with the 160 scored questions and are not flagged, so treat every question as if it counts. Only the 160 scored items determine your result.
The NBRC publishes the Detailed Content Outline for the SDS exam, effective September 2023, on its website. It is the authoritative source for every objective and subpoint. For background on the credential itself, see our What Is SDS Certification? overview.