Preoperative Preparation - Domain Overview
Preoperative Preparation (PREOP) covers everything that happens before the first incision: verifying the correct patient and procedure, positioning the patient safely, preparing the skin, draping the sterile field, and setting up the room and instrumentation. It accounts for approximately 12.7% of the CST exam (19 of 150 scored items).
What This Domain Covers
- Patient assessment, informed consent verification, and the Universal Protocol (site marking, preprocedure verification, and time-out).
- Safe patient positioning technique and injury prevention across supine, prone, lateral, lithotomy, and Trendelenburg positions.
- Surgical skin preparation - agent selection, application technique, and contraindications.
- Draping sequences and the core rules governing sterile field boundaries.
- Room and instrumentation setup, including case cart preparation and preference card use.
- The surgical scrub, gowning, and gloving process.
Why PREOP Matters in Practice
Every error prevented before incision - a wrong-site mismatch caught at time-out, a positioning injury avoided through proper padding, a contamination event avoided through correct draping sequence - protects the patient before the procedure even begins. This domain reflects the surgical technologist's direct, hands-on role in patient safety during the highest-risk transition period of the entire case.
Frequently Asked Questions
What percentage of the CST exam is PREOP?
Preoperative Preparation makes up approximately 12.7% of the exam, or 19 of the 150 scored questions.
What is the single most tested PREOP topic?
The Universal Protocol and time-out process is one of the most consistently tested PREOP topics, alongside patient positioning and its associated injury risks.
How is PREOP different from INTRA content?
PREOP covers everything up to and including the moment of incision - verification, positioning, prep, and draping - while INTRA covers the procedure itself, from instrument passing through closure.
Explore the full PREOP study suite: Glossary, Exam Tips, Exam Day Guide, and Common Mistakes.