TL;DR
The CST exam, administered by the National Board of Surgical Technology and Surgical Assisting (NBSTSA), certifies surgical technologists who can maintain sterile fields, pass instruments, and assist in operating rooms. The exam has 200 multiple-choice questions (175 scored, 25 pretest) covering preoperative, intraoperative, and postoperative care, along with ancillary duties and basic sciences. You need a scaled score of approximately 56% to pass, but don't let that number fool you — the questions are scenario-based and require deep understanding of surgical procedures, instrumentation, and sterile technique. A focused 5–6 week study plan targeting your weakest areas will prepare you effectively.
How to Pass the CST Certified Surgical Technologist in 2026
| Total questions | 200 (175 scored) |
| Time allowed | 4 hours |
| Passing score | ~56% scaled |
| First-time pass rate | ~70% |
| Certification renewal | Every 4 years (CE credits required) |
| Average salary (CST) | $52,000/year |
The CST certification is the professional credential that validates your competency as a surgical technologist. Whether you're a recent graduate of an accredited surgical technology program or an experienced OR professional seeking certification, the exam tests your ability to function safely and effectively in the surgical environment.
The exam is divided into three main domains: Perioperative Care (covering preoperative patient preparation, intraoperative procedures, and postoperative duties), Administrative and Personnel (covering operating room management, sterilization, and professional responsibilities), and Basic Sciences (anatomy, physiology, microbiology, and pharmacology as they relate to surgical practice).
The most heavily tested area is intraoperative care — this includes instrument identification and handling, maintaining the sterile field, surgical counts, hemostasis, specimen handling, and anticipating the surgeon's needs during procedures. If you can master intraoperative concepts, you're well on your way to passing. The basic sciences section often trips up candidates who focused too much on hands-on skills and neglected the underlying anatomy, microbiology, and pharmacology.
Study Schedule
Week 1: Preoperative Care
- -Review patient identification and assessment procedures
- -Study skin preparation protocols — solutions, techniques, documentation
- -Master surgical positioning — supine, prone, lateral, lithotomy, Trendelenburg
- -Review patient safety during positioning — nerve damage, pressure points, restraints
- -Complete 2 adaptive sessions focused on preop modules
Week 2: Intraoperative Care — Instruments and Sterile Technique
- -Study surgical instrument classifications — cutting, grasping, retracting, clamping
- -Review instrument passing techniques — loaded vs unloaded, hand signals
- -Master surgical counts — initial, closing, and reconciliation procedures
- -Study sterile field maintenance — breaks in technique, contamination management
- -Complete 2 adaptive sessions and 1 topic drill on instruments
Week 3: Intraoperative Care — Hemostasis and Specimens
- -Study hemostasis methods — mechanical, chemical, thermal, pharmacological
- -Review electrosurgery safety — grounding pads, modes (cut vs coag), fire prevention
- -Master specimen handling — labeling, preservation, chain of custody
- -Study postoperative dressing application and wound classification
- -Review OR turnover procedures — cleaning, setup, time management
- -Complete 2 adaptive sessions on intraop modules
Week 4: Ancillary Duties and Sterilization
- -Review administrative responsibilities — case scheduling, preference cards, documentation
- -Master sterilization methods — steam, EtO, Sterrad, Cidex, biological indicators
- -Study sterilization monitoring — mechanical, chemical, biological indicators
- -Review packaging and wrapping techniques — shelf life, event-related sterility
- -Complete 2 adaptive sessions on ancillary modules
Week 5: Basic Sciences
- -Review surgical anatomy — body cavities, organ systems, surgical landmarks
- -Study microbiology — surgical site infections, chains of infection, asepsis principles
- -Review pharmacology — anesthetic agents, local anesthetics, antibiotics, hemostatic agents
- -Complete 2 adaptive sessions covering science modules
Week 6: Full Review and Exam Simulation
- -Take 2 full timed mock exams under realistic conditions
- -Review all missed questions — categorize errors by domain
- -Do targeted topic drills on your 3 weakest modules
- -Review exam logistics — test center rules, permitted items, timing strategy
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Start practicing free →Common Mistakes to Avoid
Focusing only on instrument identification
Instrument knowledge is important, but the exam tests broader surgical concepts — sterile technique, patient safety, pharmacology, and decision-making during complications. Balance your study across all domains.
Not understanding the WHY behind sterile technique
Don't just memorize rules — understand why they exist. When you understand the microbiology of surgical site infections, sterile field questions become logical rather than arbitrary.
Ignoring pharmacology
Know the common anesthetic agents (general and local), their effects, common medications used in surgery (epinephrine, heparin, thrombin, antibiotic irrigation), and medication safety principles. This is a frequently missed domain.
Confusing sterilization methods
Know which sterilization method is appropriate for which type of instrument — steam for heat-stable items, low-temperature methods (EtO, Sterrad) for heat-sensitive items. Know monitoring parameters and biological indicator requirements for each method.
Rushing through surgical count questions
Count questions test your understanding of when counts happen, what gets counted, and what to do when counts are incorrect. The answer to a wrong count is NEVER to ignore it — always follow facility protocol for count discrepancies.
Score Targets
The CST exam uses scaled scoring. You need approximately 56% of scored questions correct to pass (roughly 98 out of 175 scored questions). Note that 25 of the 200 questions are unscored pretest items — you won't know which ones, so treat every question as if it counts.
Aim for 65–70% on practice tests to give yourself a comfortable margin. The exam is scenario-based, and many questions require you to apply knowledge rather than simply recall facts, so practice test scores may be slightly lower than your actual knowledge level.
Your Valenke readiness report will show domain-specific scores. If any domain is below "Ready" level, focus your remaining study time there. Intraoperative care is the largest domain and carries the most weight.
Exam Day Checklist
- The exam is 4 hours — pace yourself at roughly 1 minute per question with time to review
- For instrument identification questions, visualize the instrument in your hand and think about what procedure you'd use it in
- When a question describes a break in sterile technique, the correct action is always to address it immediately — never ignore contamination
- For "what do you do first" questions, patient safety always comes before documentation or notification
- Skip questions you're unsure about and return to them — don't let one tough question eat 5 minutes
- Trust your clinical experience — if you've been in the OR, your instincts about correct technique are usually right
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