- What Domain 1 Actually Covers
- Preoperative Responsibilities You'll Be Tested On
- Intraoperative Procedures: The Real Weight of Domain 1
- Postoperative Care and Wound Management
- How PSI Writes Domain 1 Questions
- Scheduling Domain 1 Into Your Study Plan
- Common Mistakes Candidates Make on Domain 1
- Frequently Asked Questions
- Domain 1: Perioperative Care makes up 55% of the CSFA exam - more than the other two domains combined.
- Intraoperative Procedures drives most of Domain 1's weight, so hemostasis, exposure, and tissue handling questions dominate.
- The exam has 175 total questions (150 scored, 25 unscored pretest) over a 4-hour window administered by PSI.
- You need 99 correct scored answers to pass - Domain 1 alone can make or break that number.
What Domain 1 Actually Covers
If you've already reviewed the CSFA Exam Domains 2026: Complete Guide to All 3 Content Areas, you know the NBSTSA splits the exam into three content areas: Perioperative Care, Ancillary Duties, and Basic Science. Perioperative Care is by far the heaviest, accounting for 55% of the 150 scored questions on the exam. That means roughly 82-83 of the questions you'll answer for a score come directly from this single domain.
Domain 1 is not one narrow topic - it's an umbrella that spans the entire surgical episode from the moment a patient is prepped through the moment the incision is closed and dressed. NBSTSA groups this domain around three phases of care: preoperative, intraoperative, and postoperative. But the phases are not weighted equally. Intraoperative Procedures - the actual assisting work at the table - is what pushes Domain 1's percentage so high, because it includes tissue handling, hemostasis, exposure, retraction, and wound closure assistance, all of which are core to what a Certified Surgical First Assistant does every working day.
Preoperative Responsibilities You'll Be Tested On
Before intraoperative content takes over, expect questions on the preparatory work that sets up a safe procedure. This portion of Domain 1 tests your ability to apply clinical judgment before the first incision, not just recall facts.
Preoperative Assessment and Positioning
Candidates must understand how patient positioning choices affect surgical access, nerve protection, and physiological stability during long procedures.
- Verifying surgical site marking and patient identification against the consent
- Selecting and applying positioning devices to prevent pressure injury and nerve compression
- Recognizing positioning-related risks specific to procedure type (lateral, lithotomy, prone, Trendelenburg)
- Confirming skin prep technique and antisepsis based on surgical site and patient risk factors
You'll also see items on draping sequence, sterile field creation, and instrument/equipment verification - all framed as "first assistant" responsibilities rather than scrub tech duties, since the exam distinguishes between the two roles even when the tasks overlap.
Intraoperative Procedures: The Real Weight of Domain 1
This is where most of your Domain 1 study time should go. Intraoperative Procedures is the single largest content cluster on the entire CSFA exam, and it tests hands-on assisting skills that only make sense in the context of live surgery.
Hemostasis and Tissue Handling
Expect scenario-based questions asking you to identify the appropriate hemostatic technique or instrument for a given bleeding pattern or tissue type.
- Electrosurgical hemostasis versus mechanical methods (clips, ties, sutures)
- Recognizing when a bleeding vessel requires a different approach than surface oozing
- Atraumatic tissue handling principles to minimize damage during retraction and dissection
Exposure and Retraction
Questions test your understanding of how to maintain a clear operative field without compromising tissue integrity or surgeon visibility.
- Selecting retractor type based on anatomical location and depth
- Coordinating retraction with the surgeon's line of sight and instrument path
- Anticipating anatomical landmarks to avoid inadvertent injury during exposure
Suturing, Stapling, and Wound Closure Assistance
Because closure is a defining CSFA task, expect detailed questions on suture material selection, needle types, and layered closure technique.
- Absorbable versus non-absorbable suture selection by tissue type
- Stapling device indications and complication recognition
- Closure technique appropriate to wound tension and healing intent
Key Takeaway
Treat every intraoperative topic as a decision-making scenario, not a memorization list. PSI writes these items to test judgment - "what would you do next" - far more often than simple fact recall.
Postoperative Care and Wound Management
The final piece of Domain 1 covers what happens after closure. This portion is smaller than intraoperative content but still shows up consistently across the 150 scored questions.
- Dressing selection based on wound type, drainage, and infection risk
- Recognizing early signs of surgical site complications (dehiscence, hematoma, infection)
- Drain management and documentation of postoperative findings
- Communicating findings to the surgical team and documenting per protocol
Don't underestimate this section just because it's proportionally smaller than intraoperative content - a handful of missed postoperative questions can matter when you're trying to clear the 99-correct passing threshold across all 150 scored items.
How PSI Writes Domain 1 Questions
The CSFA exam is delivered as a computer-based multiple-choice test through PSI testing centers, with 175 total questions - 150 scored plus 25 unscored pretest items you won't be able to distinguish during the exam. You'll have 4 hours to complete the full exam, which gives you roughly 1.4 minutes per question if you pace evenly, though scenario-heavy Domain 1 items often take longer to read and reason through than Basic Science recall questions.
Domain 1 questions are typically written as short clinical vignettes: a brief description of a procedure, patient condition, or intraoperative event, followed by a "what should the first assistant do" or "what is the most appropriate technique" prompt. This style rewards candidates who have hands-on clinical exposure from a CAAHEP-accredited Surgical First Assistant program, since the vignettes assume familiarity with real operating room workflow rather than textbook definitions alone.
Scheduling Domain 1 Into Your Study Plan
Because Domain 1 represents 55% of the scored exam, it deserves more than half of your total study hours - not just proportional time, but front-loaded priority since intraoperative reasoning skills take longer to build than fact memorization. If you haven't built a full plan yet, the CSFA Study Guide 2026: How to Pass on Your First Attempt lays out a broader framework you can adapt around this domain-specific schedule.
Intraoperative Procedures Foundation
- Study hemostasis techniques and instrument selection by tissue type
- Review exposure and retraction principles across common procedure types
- Work through scenario-based practice items, not flashcards alone
Closure Technique and Preoperative Review
- Master suture, staple, and closure decision-making
- Review positioning, prepping, and draping standards
- Cross back to Domain 2 and Domain 3 topics to keep them warm
Postoperative Integration and Full Practice
- Study wound complication recognition and dressing selection
- Take full-length timed practice sets covering all three domains
- Review missed questions by domain to identify remaining Domain 1 gaps
Repetition matters here, but so does variety in question exposure. Rotating through different scenario types on our practice test platform helps you get comfortable with how PSI phrases intraoperative decision-making questions before you sit for the real exam.
| Domain | Exam Weight | Primary Focus |
|---|---|---|
| Domain 1: Perioperative Care | 55% | Preoperative, intraoperative, and postoperative assisting tasks |
| Domain 2: Ancillary Duties | 14% | Supporting responsibilities outside direct surgical assisting |
| Domain 3: Basic Science | 31% | Anatomy, physiology, microbiology, and pharmacology foundations |
For a breakdown of the other two content areas, see the dedicated guides on CSFA Domain 2: Ancillary Duties (14%) - Complete Study Guide 2026 and CSFA Domain 3: Basic Science (31%) - Complete Study Guide 2026.
Common Mistakes Candidates Make on Domain 1
Because Domain 1 feels the most "practical" and familiar to working surgical technologists transitioning into the first assistant role, many candidates underestimate how differently PSI frames the material compared to on-the-job experience.
- Relying on job experience instead of exam-style reasoning. Real-world habits don't always match the "most appropriate" answer PSI is looking for in a vignette.
- Skimming postoperative content. It's a smaller slice of Domain 1, but skipping it outright leaves easy points on the table.
- Under-practicing timed scenarios. With 175 questions in 4 hours, slow reasoning on long intraoperative vignettes can eat into time needed elsewhere.
- Ignoring how heavily this domain affects overall difficulty. If you're wondering why this exam has a reputation for being tough, our How Hard Is the CSFA Exam? Complete Difficulty Guide 2026 article explains how Domain 1's weight directly shapes that difficulty.
It's also worth remembering the practical side of pursuing this credential. The CSFA exam requires graduation from a CAAHEP-accredited Surgical First Assistant program, and registration costs $240 for AST members or $350 for non-members. If you're still weighing whether the investment makes sense relative to career outcomes, Is the CSFA Certification Worth It? Complete ROI Analysis 2026 and CSFA Certification Cost 2026: Complete Pricing Breakdown cover the full financial picture, while CSFA Salary Guide 2026: Complete Earnings Analysis looks at what certified assistants can expect to earn. For a broader look at practice question formats across all domains, check out Best CSFA Practice Questions 2026: What to Expect on the Exam, and try a set on our full-length practice exams to gauge where you stand before scheduling your test date.
Frequently Asked Questions
NBSTSA weights the exam to reflect actual job duties. Since intraoperative assisting - hemostasis, exposure, tissue handling, and closure - is the core function of a Certified Surgical First Assistant, Perioperative Care carries the largest share of scored questions.
The exam includes 150 scored questions, and Domain 1 accounts for 55% of that total. The exam also includes 25 additional unscored pretest questions mixed in among the 175 total questions, which are not identified during the test.
Intraoperative Procedures carries the most weight within Domain 1, covering hemostasis, exposure, retraction, and closure assistance. Preoperative and postoperative content still appear but in smaller proportion, so allocate study time accordingly rather than splitting it evenly.
No. PSI testing centers do not allow textbooks, notes, study materials, personal electronics, or personal items in the testing room for any part of the exam. Scratch paper is provided but must be returned at the end of your session.
No. NBSTSA does not publish domain-specific passing thresholds - you need 99 correct answers across all 150 scored questions combined from all three domains, not a separate passing score within Domain 1 alone.