CSFA Exam Flashcards

Q: How many questions are on the CSFA exam and how much time do I get?

The CSFA exam has 175 total multiple-choice questions: 150 scored and 25 unscored pretest items used only for statistical analysis. You get 4 hours to complete the computer-based exam at a PSI test center, and pretest items are indistinguishable from scored ones during testing.

Q: What score do I need to pass the CSFA exam?

You must answer 99 of the 150 scored questions correctly, which is approximately 66%. The 25 unscored pretest items do not count toward your score, so treat every question on the exam as if it counts.

Q: What happens if I fail the CSFA exam, and how soon can I retest?

NBSTSA sets no mandatory waiting period before reapplying, but candidates may test no more than three times per calendar year, and each attempt requires a new application and the full testing fee. Once you've used all three attempts in a calendar year, you must wait until the next calendar year to test again.

Q: What is the CSFA pass rate?

NBSTSA's 2025 certification data reports a 62% first-time national pass rate for the CSFA exam, down from 71.2% in 2024 and 78.2% in 2023. This is noticeably lower than the CST exam's roughly 68-69% first-time pass rate over the same period.

Q: How long is CSFA certification valid, and how do I renew it?

NBSTSA shortened the certification cycle from four years to two years, effective January 1, 2020. To renew, CSFAs must earn 38 AST-approved continuing education credits (including at least 8 live credits) within the current two-year cycle and submit the NBSTSA renewal application.

Q: What are the CSFA content domains and their official weights?

Perioperative Care is 55% of the exam (83 of 150 scored items): Preoperative Preparation (8 items), Intraoperative Procedures (67 items, by far the largest single section), and Postoperative Procedures (8 items). Ancillary Duties is 14% (21 items: Administrative/Personnel 6, Equipment Sterilization/Maintenance 15). Advanced Science is 31% (46 items: Advanced Anatomy/Physiology 36, Advanced Principles of Microbiology 5, Surgical Pharmacology and Anesthesia 5).

Question 1

What three confirmations must the entire surgical team verbally complete during the Time-Out, immediately before incision?

Accepted Answer

Correct patient identity, correct surgical site/side, and correct procedure — required by the Universal Protocol to prevent wrong-patient, wrong-site, and wrong-procedure surgery.

Question 2

What three factors should guide suture selection for a given wound, per the CSFA content outline?

Accepted Answer

The intended usage/purpose of the closure, the tissue type being sutured, and the specific characteristics of the wound (tension, contamination, cosmetic priority) — not habit or availability alone.

Question 3

In what direction is surgical skin prep applied, and why does the pattern matter?

Accepted Answer

From the incision site outward to the periphery in a circular motion; once a sponge reaches the periphery it is discarded rather than returned to the center, keeping the cleanest area at the incision site.

Question 4

What philosophy do Halsted's Principles of surgery embody for a first assistant handling tissue?

Accepted Answer

Gentle tissue handling, meticulous hemostasis, strict aseptic technique, accurate anatomic dissection, and tension-free closure — minimizing trauma to preserve blood supply and reduce infection and scarring.

Question 5

How does applying traction and counter-traction assist tissue dissection?

Accepted Answer

Opposing tension is placed on tissue from two directions to create a taut, visible dissection plane, letting the surgeon separate structures cleanly with less inadvertent injury to surrounding anatomy.

Question 6

How does monopolar electrocautery complete its circuit, and what complication can occur if that pathway is disrupted?

Accepted Answer

Current flows from the active electrode through the patient's body to a dispersive (grounding) pad and back to the generator; if current finds an unintended alternate path (current diversion), it can burn tissue at a distant contact site.

Question 7

Why is bipolar cautery preferred over monopolar near delicate structures like nerves or digits?

Accepted Answer

Bipolar current flows only between the two tips of the forceps through the grasped tissue — no grounding pad or whole-body circuit is needed, so there is no current-diversion risk to surrounding structures.

Question 8

Where should the monopolar return electrode (grounding) pad be placed, and why?

Accepted Answer

Over a large, well-vascularized muscle mass close to the surgical site, avoiding bony prominences, scar tissue, and metal implants — poor placement increases burn risk and circuit impedance.

Question 9

What are the two primary methods of PERMANENT surgical hemostasis for a clamped vessel?

Accepted Answer

Ligation (tying off the vessel with suture) and applying a mechanical hemostatic clip — both provide lasting occlusion, unlike temporary measures.

Question 10

Name three TEMPORARY hemostasis techniques and one safety limit among them.

Accepted Answer

Direct digital pressure (for diffuse oozing), vessel loops (encircle without crushing), and a pneumatic tourniquet — a tourniquet's inflation time is capped at about 2 hours to avoid ischemic and nerve injury.

Question 11

When are topical hemostatic agents like Surgicel or Gelfoam chosen over ligation?

Accepted Answer

For diffuse oozing from a raw surface where no single discrete bleeding vessel can be clamped or tied — thrombin-soaked Gelfoam adds an enzymatic clotting boost on top of the mechanical scaffold.

Question 12

What makes a taper point needle suitable for closing fascia or bowel?

Accepted Answer

Its round body has no cutting edges, so it separates tissue fibers rather than slicing them — ideal for softer, more friable tissue where minimizing trauma matters more than penetrating force.

Question 13

How does a reverse-cutting needle differ from a conventional cutting needle, and what is each used for?

Accepted Answer

Both have triangular, sharp-edged bodies for tough tissue like skin; a conventional cutting needle has its cutting edge on the inner curvature (risking suture pull-through), while a reverse-cutting needle places it on the outer curvature, reducing that risk — commonly preferred for skin closure.

Question 14

What is the key handling trade-off between monofilament and braided suture?

Accepted Answer

Monofilament passes smoothly with minimal tissue drag and fewer surfaces to harbor bacteria, but has more memory/kinking; braided suture handles and knots more securely with higher tensile strength, but its interstices can trap bacteria.

Question 15

Give one example each of an absorbable and a non-absorbable suture, and the general rule for choosing between them.

Accepted Answer

Vicryl (polyglactin 910) or PDS are absorbable and broken down by the body — used for internal layers; nylon or Prolene are non-absorbable and remain permanently or require removal — used for skin closure or mesh reinforcement.

Question 16

In USP suture sizing, does a higher number of zeros (e.g., 5-0 vs 2-0) mean a thicker or thinner strand?

Accepted Answer

Thinner. More zeros means a smaller diameter suture (5-0 is finer than 2-0) — fine sutures are used for delicate tissue like vessels or skin, thicker sutures for high-tension closures like fascia.

Question 17

Which suture pattern best everts wound edges, and how is it placed?

Accepted Answer

The vertical mattress suture, placed with a far-far bite followed by a near-near bite on the return pass — the added superficial bite rolls the skin edges outward for better apposition and cosmetic healing.

Question 18

Why might a surgeon choose a running LOCKED suture pattern over a simple running pattern?

Accepted Answer

Each loop locks into the prior stitch, adding compressive tension along the wound edge — useful for hemostasis in a bleeding tissue plane, though it can compromise blood supply if pulled too tight.

Question 19

Distinguish primary, secondary, and tertiary intention wound healing.

Accepted Answer

Primary intention: clean edges approximated and closed immediately (minimal scar). Secondary intention: wound left open to heal by granulation and contraction (used for contaminated wounds). Tertiary (delayed primary) intention: left open briefly to confirm no infection, then surgically closed days later.

Question 20

What surgical tasks do linear vs. intraluminal (circular) stapling devices perform?

Accepted Answer

Linear staplers fire parallel rows of staples (often with a cutting blade) to divide and seal tissue such as bowel; intraluminal/circular staplers create a circular anastomosis, most commonly for GI reconnections like esophagojejunostomy.

Question 21

Why would a first assistant choose a Bookwalter retractor over a handheld Army-Navy retractor?

Accepted Answer

The Bookwalter is a table-mounted, self-retaining system built for deep, sustained abdominal exposure without tiring an assistant's hands; the Army-Navy is a simple handheld retractor suited to small, superficial wounds needing brief retraction.

Question 22

How does a Penrose drain differ from a Jackson-Pratt drain in mechanism and typical use?

Accepted Answer

A Penrose drain is open and passive, wicking fluid by gravity/capillary action from a superficial space; a Jackson-Pratt drain is a closed system using a compressible bulb to create active suction, suited to deeper spaces where measurable output matters.

Question 23

At what points during a procedure must sharps, instruments, and sponges be counted?

Accepted Answer

Before the case begins (baseline), before closing any body cavity, at skin closure, and whenever new items are added to the field or personnel are relieved — accurate counts prevent retained surgical items, a preventable 'never event.'

Question 24

What is the standard insufflation pressure for laparoscopic pneumoperitoneum, and what does a Veress needle do?

Accepted Answer

CO2 is typically insufflated to 12-15 mmHg; the Veress needle is a blind-entry instrument whose spring-loaded blunt inner stylet retracts on contact with the abdominal wall and springs back out once inside the peritoneal cavity, shielding viscera during entry.

Question 25

What must happen to a surgical wound before a sterile dressing is applied?

Accepted Answer

The wound is cleaned and prepared — excess blood and debris removed and surrounding skin addressed — so the dressing chosen (dry gauze, negative-pressure therapy, etc.) matches the wound's drainage and healing needs.

Question 26

What general timing principle guides when non-absorbable skin sutures or staples are removed?

Accepted Answer

Earlier removal (about 5-7 days) is favored in well-vascularized, low-tension areas like the face for cosmetic results, while higher-tension areas like the trunk or extremities are typically left 10-14 days to preserve wound strength and prevent dehiscence.

Question 27

What is the CSFA's responsibility during a patient's emergence from anesthesia?

Accepted Answer

Ensure the patient's safety and privacy — removing drapes, cords, and instruments from the patient, guarding against fall or self-extubation injury, and maintaining dignity through transfer out of the OR.

Question 28

What defines the legal boundary of a CSFA's scope of practice in the operating room?

Accepted Answer

State practice acts, facility policy, and direct delegation by the supervising surgeon — a CSFA assists under the surgeon's direction and never independently performs tasks outside that delegated first-assist role.

Question 29

What are the three elements of the OR fire triangle, and how is fire risk reduced during a procedure?

Accepted Answer

Oxygen (an enriched or open O2 source), fuel (drapes, alcohol-based prep, hair), and an ignition source (electrocautery, laser); risk is reduced by letting prep solutions fully dry and coordinating cautery activation with the anesthesia provider when supplemental oxygen is in use.

Question 30

What time and temperature define standard gravity-displacement steam sterilization?

Accepted Answer

A minimum of 121°C (250°F) for roughly 15-30 minutes, depending on the load — steam displaces air downward within the chamber under gravity alone, without a mechanical vacuum assist.

Question 31

How does prevacuum steam sterilization improve on gravity displacement?

Accepted Answer

A pump actively pulls air out of the chamber before steam is injected at a higher 132°C (270°F), giving faster, more reliable penetration into packs and shorter overall cycle times than gravity displacement.

Question 32

When is ethylene oxide (EtO) gas sterilization used instead of steam?

Accepted Answer

For heat- and moisture-sensitive items — certain endoscopes, plastics, and electronic components — that would be damaged by autoclaving; EtO requires an extended aeration period afterward to clear toxic residue before the item is safe to use.

Question 33

What does the Bowie-Dick test verify, and how often is it performed?

Accepted Answer

It verifies adequate air removal in a prevacuum steam sterilizer; it is run once daily in an empty chamber before the first instrument load of the day.

Question 34

What does a Class 5 chemical indicator confirm, and why does suspected prion contamination require a different protocol?

Accepted Answer

A Class 5 integrating indicator confirms that all critical sterilization parameters — time, temperature, and steam saturation — were met for that specific load; prions resist routine steam sterilization, so contaminated instruments require an extended cycle at 134°C rather than standard parameters.

Question 35

What three structures form the boundaries of Calot's triangle, and why is it critical during cholecystectomy?

Accepted Answer

The cystic duct, the common hepatic duct, and the inferior edge of the liver; safely identifying the cystic artery and duct within this triangle before clamping or cutting is key to avoiding bile duct injury.

Question 36

What are the boundaries of Hesselbach's triangle, and which type of hernia passes through its floor?

Accepted Answer

Bounded by the inferior epigastric vessels laterally, the rectus sheath edge medially, and the inguinal ligament inferiorly; a direct inguinal hernia pushes through this triangle's floor, medial to the epigastric vessels.

Question 37

How does an indirect inguinal hernia's path differ from a direct hernia's?

Accepted Answer

An indirect hernia is congenital, exiting through the deep inguinal ring lateral to the inferior epigastric vessels and following the spermatic cord or round ligament; a direct hernia is an acquired weakness that bulges directly through Hesselbach's triangle, medial to those vessels.

Question 38

Moving lateral to medial, what does the NAVEL mnemonic list for femoral triangle contents?

Accepted Answer

Nerve (femoral nerve), Artery (femoral artery), Vein (femoral vein), Empty space (femoral canal), Lymphatics — the lateral-to-medial order matters for locating structures during femoral vascular or hernia procedures.

Question 39

Why is the recurrent laryngeal nerve a key structure to protect during thyroid or parathyroid surgery?

Accepted Answer

It innervates the intrinsic muscles that control vocal cord movement; injury can cause hoarseness or, if bilateral, airway compromise — it runs close to the inferior thyroid artery and the ligament of Berry, both high-risk dissection zones.

Question 40

What is the functional purpose of the Circle of Willis?

Accepted Answer

It connects the anterior and posterior cerebral circulations through communicating arteries, providing collateral blood flow that can maintain brain perfusion if one contributing vessel becomes occluded.

Question 41

What does the SITS mnemonic identify, and why does it matter for shoulder procedures?

Accepted Answer

The four rotator cuff muscles — Supraspinatus, Infraspinatus, Teres minor, Subscapularis — which stabilize the humeral head in the glenoid; recognizing each is essential for shoulder arthroscopy and repair assisting.

Question 42

What changes in the rectus sheath's structure at the arcuate line, and why does it matter for abdominal closure?

Accepted Answer

Below the arcuate line, the posterior rectus sheath disappears, leaving only transversalis fascia behind the rectus muscle — this thinner posterior support is a recognized area of relative weakness relevant to abdominal wall closure and hernia risk.

Question 43

What proportion of the liver's blood supply comes from the portal vein versus the hepatic artery?

Accepted Answer

Roughly 70-75% arrives via the portal vein (nutrient-rich, lower-oxygen blood from the gut) and about 25-30% via the hepatic artery (oxygen-rich) — this dual supply is why isolated arterial injury alone is less likely to cause total hepatic ischemia.

Question 44

How do the territories supplied by the celiac trunk and the superior mesenteric artery (SMA) differ?

Accepted Answer

The celiac trunk supplies foregut derivatives — stomach, spleen, liver, and proximal duodenum; the SMA supplies midgut structures from the distal duodenum through the proximal two-thirds of the transverse colon.

Question 45

At what vertebral level is the esophageal hiatus located, and what passes through it?

Accepted Answer

T10 — the esophagus and both vagus nerves pass through this diaphragmatic opening, making it the relevant landmark in hiatal hernia repair and fundoplication.

Question 46

Why are displaced intracapsular femoral neck fractures at higher risk of avascular necrosis than extracapsular (intertrochanteric) fractures?

Accepted Answer

The femoral head depends on retinacular vessels (branches of the medial/lateral femoral circumflex arteries) that run along the femoral neck; a displaced intracapsular fracture can tear these vessels, while extracapsular fractures spare them because they lie outside the joint capsule.

Question 47

What is the most common causative organism of surgical site infections, and what complicates treatment of resistant strains?

Accepted Answer

Staphylococcus aureus is the leading SSI pathogen; MRSA (methicillin-resistant S. aureus) strains resist standard beta-lactam antibiotics, requiring alternative agents such as vancomycin.

Question 48

What do the four CDC surgical wound classifications (Class I-IV) predict?

Accepted Answer

Clean, Clean-Contaminated, Contaminated, and Dirty-Infected classifications predict a wound's relative infection risk, guiding decisions on prophylactic antibiotics and whether to close the wound primarily or leave it open.

Question 49

What is malignant hyperthermia, and what is the immediate first-line treatment?

Accepted Answer

A life-threatening hypermetabolic reaction to volatile anesthetics or succinylcholine, causing rapid temperature rise, muscle rigidity, and tachycardia; treated immediately with IV dantrolene sodium plus active cooling and discontinuing the triggering agent.

Question 50

Which agent reverses heparin, and which reverses warfarin — are they interchangeable?

Accepted Answer

Protamine sulfate reverses heparin by binding and neutralizing it; Vitamin K (phytonadione) reverses warfarin by restoring vitamin K-dependent clotting factor synthesis — the two work through different mechanisms and are not interchangeable.

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