CRCST Practice Test: 150 Questions, 3-Hour Full Exam (Free)

Published 2026-11-05 · Facts and text checked 2026-11-02 · Questions from our CRCST study guide · Reviewed by Hana N., Quality Reviewer

This free full-length CRCST practice exam has 150 questions and a 3-hour timer, the same length as the real exam, which has 125 scored and 25 unscored questions. At the end you see your result by HSPA section and every answer explained. The questions come from our CRCST study guide.

The real exam
Fact	Value and source
Number of questions	150 questions (125 scored, 25 unscored)HSPA: Certification Handbook (revised January 2026) · checked 2026-10-10
Exam time	3 hoursHSPA: Certification Handbook (revised January 2026) · checked 2026-10-10
Passing score (how it works)	Pass/fail only: HSPA does not publish a numeric passing score. The cut point is set with a criterion-referenced method (Angoff, with the Beuk compromise).HSPA: CRCST certification page · checked 2026-10-10

Start the timer when you are ready. You can change answers until you finish; questions you leave blank count as wrong. Answers and explanations appear when you finish, with your result by area. Nothing is saved.

3:00:000 of 150 answered

Question 1

A chemical indicator that reacts to time, temperature, and presence of steam is classified as:

Question 2

In a prevacuum steam sterilizer, the standard sterilization cycle is:

Question 3

A prevacuum steam sterilizer is set for a sterilization cycle. Which temperature and time combination is correct for this type of sterilizer?

Question 4

When rinsing a lumen after manual cleaning, what is the minimum volume of water that should be flushed through each channel?

Question 5

To prevent damage to the sterile wrapper during transport, how should sharp instruments be oriented in a wrapped set?

Question 6

What is the typical soak time range recommended for enzymatic cleaners used on surgical instruments?

Question 7

A technician is testing a pair of scissors for cutting performance. According to standard practice, how should the scissors be tested?

Question 8

In a gravity displacement steam sterilizer, where does steam enter the chamber?

Question 9

Why should gross soil be rinsed from instruments under cool running water rather than warm or hot water during initial cleaning?

Question 10

According to AAMI standards, which step must precede sterilization of a reusable surgical instrument?

Question 11

To minimize back strain when lifting, how close should a load be held to the body?

Question 12

Where should delicate microsurgical scissors and fine forceps be placed in a sterilization tray?

Question 13

When positioning a concave container within a set, what rule must be followed to avoid a wet pack?

Question 14

In a steam-flush pressure-pulse (SFPP) cycle, air removal is achieved primarily by:

Question 15

How is air removed from the chamber during a gravity displacement sterilization cycle?

Question 16

For a gravity displacement steam sterilizer, what is the minimum temperature and time required for sterilization?

Question 17

When performing sterile gowning, which area of the gown is considered unsterile?

Question 18

A pass-through washer-decontaminator is designed to:

Question 19

What material is commonly used to test the cutting ability of scissors during instrument inspection?

Question 20

Before processing an electrosurgical device used in thoracic surgery, what is a critical inspection step?

Question 21

During a chemical spill in the central service department, after protecting yourself and alerting others, what is the next immediate action?

Question 22

After cleaning a laparoscopic grasper, a sterile processing technician inspects it under 2.5x magnification and notices a discolored spot on the jaw serrations. What should the technician do next?

Question 23

During manual cleaning, if the water temperature exceeds which threshold, protein can denature and chemically bond to the instrument surface?

Question 24

A technician is processing a load of wrapped linen packs using a gravity displacement steam sterilizer set to 121°C. According to standard parameters, what is the minimum exposure time required for this cycle?

Question 25

A prevacuum steam sterilizer is set to 134°C. After the vacuum phase, what is the typical sterilization hold time for such a cycle?

Question 26

Where should the count sheet be placed in a sterilization set, and how should it be protected?

Question 27

After cleaning up a chemical spill, the contaminated absorbent material must be disposed of. What documentation is typically required for the disposal process?

Question 28

A gravity displacement steam sterilizer is set to run a wrapped instrument cycle at 250°F (121°C). What are the correct exposure time and pressure range for this cycle?

Question 29

A central service technician is validating the performance of a washer-decontaminator. Which combination of verification methods provides a comprehensive assessment of the machine's effectiveness?

Question 30

When processing microvascular instruments, which action is most critical during inspection?

Question 31

When manually cleaning instruments with visible dried-on organic soil, the best approach is to:

Question 32

A central service technician receives a set of instruments from a surgery involving a carcinoma specimen. Understanding the prefix 'carcin/o', which statement is correct regarding processing these instruments?

Question 33

How should basins and cups be oriented in a sterilization set to prevent moisture accumulation?

Question 34

During sterilization, how should a lumen instrument be oriented to allow condensate to drain?

Question 35

A technician finds that a hemostat's ratchet engages but slips under minimal pressure. Which action is correct?

Question 36

After cleaning an arthroscopy instrument set, a technician performs a visual inspection. The suffix '-oscopy' indicates that which component requires magnification to check for damage?

Question 37

A technician must select a basket for a wrapped instrument set. Basket A allows 0.5 inches of clearance between instruments and the lid, while Basket B allows 1 inch. Which basket should be chosen to meet sterilization standards?

Question 38

What are the typical temperature and exposure time for a gravity displacement steam sterilization cycle?

Question 39

After brushing a lumen, what is the minimum volume of water that should be flushed through the channel to rinse?

Question 40

During a washer-decontaminator cycle, the printout shows that the temperature in the thermal disinfection phase dropped to 75°C for 15 seconds before returning to 85°C. What should the technician do?

Question 41

Which color is used for commercial spill kits designed to handle acid spills?

Question 42

In a hospital steam sterilizer, a biological indicator fails repeatedly despite all mechanical parameters being within range. What is the most likely cause?

Question 43

During reprocessing of a flexible bronchoscope, what is the purpose of leak testing?

Question 44

Which of the following parameters must be recorded on a washer-decontaminator cycle printout to verify mechanical performance?

Question 45

According to AAMI standards, how often should a cleaning verification test such as a TOSI be performed?

Question 46

A technician is validating an ethylene oxide sterilization cycle. Which biological indicator organism is most appropriate to use?

Question 47

A technician is sorting hemostatic forceps and needs to distinguish a Kelly clamp from a Crile clamp. Which feature correctly differentiates them?

Question 48

Why is insulation integrity testing necessary for electrosurgical instruments even if they appear visually undamaged?

Question 49

In a medical device washer-decontaminator, the thermal disinfection phase must maintain the target temperature for a minimum duration. What is that minimum?

Question 50

A surgical instrument set is labeled for a procedure involving a carcinoma. What is the primary implication for the central service technician handling these instruments?

Question 51

A technician in the clean assembly area realizes she forgot to inspect a wrapped set, so she carries it back into the decontamination room to check it under magnification. What is the primary concern with this action?

Question 52

How should instruments be arranged in a tray to ensure the assembler can verify all items are present?

Question 53

A central service technician has just provided care for a patient with Clostridium difficile infection. Which hand hygiene method is required?

Question 54

A contaminated surgical instrument is placed on a clean transport cart. The instrument's outer surface acts as which link in the chain of infection?

Question 55

A technician notices that after manual cleaning, the instruments still feel slippery even after thorough rinsing. The technician is concerned because residual detergent can:

Question 56

Which of the following parameters is typical for a prevacuum steam sterilization cycle?

Question 57

After running a steam sterilization cycle, the biological indicator is incubated. The growth indicator shows no color change for the test spore, but the control vial turns yellow. What should the technician conclude?

Question 58

During assembly, which ratchet position should be used for a hinged instrument with multiple locking teeth to keep the jaws partially open?

Question 59

A sterile processing technician is assembling a surgical instrument tray for sterilization. She places a chemical integrator inside the tray. According to standard practice, where should she position the integrator to best monitor sterilization conditions?

Question 60

A palmar arch clamp is designed for use on which area?

Question 61

During functional testing of a hemostat, the technician closes the ratchet one tooth at a time and applies light pressure. What is the technician checking for?

Question 62

A technician inspecting a trocar assembly finds a dent near the seal of the cannula. What is the most likely consequence if this cannula is used in a laparoscopic procedure?

Question 63

A technician is setting up the sink for manual cleaning. What is the recommended water temperature range?

Question 64

In a busy central service department, a technician spends most of the shift in the decontamination area performing repetitive instrument cleaning. Which strategy best reduces the risk of cumulative trauma disorder?

Question 65

When cleaning a hemostat with a box lock, which type of brush should be used?

Question 66

A technician rotates the shaft of a laparoscopic grasper and observes wobbling at the tip. What is the most likely cause?

Question 67

A technician is lifting a 10-pound instrument tray with arms extended forward. Approximately how much compressive force is placed on the lumbar spine?

Question 68

A technician is preparing a load for a prevacuum steam sterilizer. The required exposure time for sterilization at 134°C is:

Question 69

What is the typical absolute pressure achieved during the vacuum phase of a prevacuum steam sterilization cycle?

Question 70

When manually cleaning instruments, the temperature of the water should be maintained between:

Question 71

After inspecting an instrument and finding no defects, what must be documented in the inspection record?

Question 72

A Class 5 chemical integrating indicator for steam sterilization verifies that which three parameters have been met?

Question 73

When carrying a heavy instrument tray from the sterilizer to the assembly table, which action best prevents back injury?

Question 74

A technician needs a spill kit for a base (alkali) chemical. Which color coding should she look for?

Question 75

A technician is preparing a battery-powered surgical saw for decontamination. What is the first step?

Question 76

When cleaning the handpiece of a battery-powered surgical tool, which method is correct?

Question 77

A technician applies a disinfectant to a countertop and wipes it dry after 30 seconds. The disinfectant label instructs a 10-minute wet contact time. What is the primary problem with this practice?

Question 78

What feature must a set count sheet include to assist with instrument identification?

Question 79

When assembling a set of hinged instruments, what is the correct position for the box lock to ensure proper steam penetration?

Question 80

A technician lubricates a pneumatic drill and then packages it for sterilization. According to best practices, within what time frame should the tool be sterilized after lubrication?

Question 81

When loading a steam sterilizer with instruments that have lumens, the lumen axis should be:

Question 82

According to typical manufacturer guidelines, after approximately how many use cycles should a pneumatic handpiece be sent for preventive maintenance?

Question 83

A technician is inspecting a clamp and must determine whether it is an appendectomy clamp or a tonsillectomy clamp based on jaw shape. Which of the following is the key distinguishing feature?

Question 84

After cleaning a laparoscopic instrument, the technician flushes the lumen and brushes it from both ends. What is an additional method to confirm the channel is clean?

Question 85

A surgical instrument is received in decontamination with visible blood and tissue from a patient known to have Creutzfeldt-Jakob disease. The instrument is also heavily soiled. According to the hierarchy of microbial resistance, which of the following must be added to the standard reprocessing protocol?

Question 86

A technician notices the sink water temperature is 145°F. What is the primary risk of cleaning instruments at this temperature?

Question 87

During inspection of a pneumatic drill, which step specifically checks the condition of the chuck and internal bearings?

Question 88

Which organism is used in biological indicators to validate steam sterilization cycles?

Question 89

Which organism is commonly used as a biological indicator for steam sterilization?

Question 90

What is the recommended soak time for an enzymatic cleaner when cleaning instruments?

Question 91

After a bilateral surgical procedure, a bilateral retractor set is returned with one retractor missing. What is the likely consequence?

Question 92

While cleaning a suction tube with a narrow lumen, which brush size should be selected?

Question 93

A steam sterilizer is being set for a load of wrapped surgical instruments. The cycle parameters must be selected based on the type of sterilizer. Which of the following combinations is correct for a gravity displacement sterilizer?

Question 94

Which type of forceps used in cardiovascular surgery is designed with fine, atraumatic teeth to minimize vessel trauma?

Question 95

Which of the following is a characteristic feature of a Castroviejo needle holder?

Question 96

According to regulatory requirements, how long must sterilization load records be retained?

Question 97

After an orthopedic procedure using a large reamer, the technician must clean the instrument. Which step is most critical to prevent damage during cleaning?

Question 98

During ultrasonic cleaning, cavitation bubbles implode and create localized conditions. What is the approximate temperature reached at the point of implosion?

Question 99

For the most reliable indication of washer-decontaminator conditions, where should a chemical indicator be placed?

Question 100

How long should a laparoscopic grasper be soaked in an enzymatic cleaner according to standard protocols?

Question 101

A flexible bronchoscope is returned to decontamination after a procedure on a patient with suspected tuberculosis. The technician knows that leak testing is required. What is the primary reason for performing leak testing on a flexible bronchoscope before cleaning?

Question 102

How long should each instrument surface be rinsed under running warm water during manual cleaning?

Question 103

A technician is drying a rigid endoscope lumen using compressed air. Facility guidelines state the pressure should be between:

Question 104

During manual cleaning of microsurgical scissors, which practice best prevents damage?

Question 105

While inspecting a laparoscopic trocar assembly, a technician inserts the obturator and feels a slight catch when retracting it. What should the technician suspect?

Question 106

When testing a reusable electrosurgical pencil, what functional check must be performed?

Question 107

Why is deionized or distilled water recommended for the final rinse in manual cleaning?

Question 108

During inspection of a laparoscopic grasping forceps, the technician rotates the shaft and observes wobble at the tip. This most likely indicates:

Question 109

A central service technician is processing a wrapped instrument tray and an unwrapped metal tray in the same steam sterilizer load. According to standard steam sterilization parameters, which statement correctly describes the exposure time for these items?

Question 110

Why are tungsten carbide inserts used in the jaws of some needle holders?

Question 111

After cleaning a surgical instrument, a technician must inspect it under magnification. According to AAMI standards, what magnification range is recommended for this inspection?

Question 112

A suction tube consists of a metal cannula and a removable inner stylet. During inspection, what must the technician do?

Question 113

Following manual cleaning, a technician inspects a set of rongeurs. Under what magnification and lighting condition should this inspection be performed?

Question 114

What are the recommended environmental parameters for storing sterile instrument packages according to AAMI standards?

Question 115

When assembling a wrapped instrument set, how much clearance must be maintained between the instruments and the lid or wrapper?

Question 116

A heavily soiled surgical instrument arrives in the decontamination area. What is the first step in processing?

Question 117

When testing the cutting ability of scissors during instrument inspection, which material is most commonly used to simulate tissue?

Question 118

Why is Geobacillus stearothermophilus the preferred biological indicator for validating steam sterilization cycles?

Question 119

Which elements must be included in a standard inspection record for an instrument?

Question 120

Which of the following infectious agents is most resistant to standard sterilization methods, including heat, chemicals, and radiation?

Question 121

When lifting a heavy instrument tray with a partner, which body mechanics should both technicians use?

Question 122

A steam sterilizer recently failed a Bowie-Dick test. The maintenance log shows that preventive maintenance was performed 6 months ago, but the manufacturer recommends quarterly maintenance. Which action is most appropriate?

Question 123

When selecting a needle for a subcutaneous injection, which of the following characteristics is most specific to this route?

Question 124

A technician notices that a set of wrapped instruments has rust stains after steam sterilization. Prior to sterilization, the instruments were manually cleaned and thoroughly rinsed. Which step in the reprocessing cycle was most likely performed incorrectly?

Question 125

A set of microvascular clamps is received in the decontamination area. What is the most important handling precaution to prevent damage?

Question 126

In an EtO sterilization room, the continuous gas monitor reads 2 ppm of ethylene oxide. According to standard safety protocols, what action should be taken?

Question 127

A technician inspects a hemostat that appears clean under standard lighting. Without using magnification, the technician passes it into a set. During surgery, the ratchet slips. What defect was most likely missed?

Question 128

A technician notices that a wrapped set contains a cellulose-based absorbent pad. Why is this problematic for hydrogen peroxide plasma sterilization?

Question 129

A surgical pack has been opened and its contents are on the sterile field. A circulating nurse hands the scrub technician a package of gauze that has been removed from its outer wrapper. The scrub technician should:

Question 130

When manually cleaning a hemostat, what must be done before submerging to ensure effective cleaning of the hinge?

Question 131

To safely handle sharp instruments during inspection, the technician should use a:

Question 132

A central service department implements a new EtO sterilizer. Which combination of safety measures represents the three layers of protection required for EtO safety?

Question 133

A set of instruments is assembled with heavy items placed on top of lightweight items, and the tray is packed tightly to prevent shifting. During sterilization, which of the following is the primary risk?

Question 134

After brushing a lumen instrument, what is the minimum volume of water that should be flushed through each channel?

Question 135

The mechanical aeration system in an EtO sterilization facility has failed, and the department must aerate a load at room temperature (20°C). What is the minimum aeration time required to ensure safe residual gas levels?

Question 136

A sterile processing technician is setting up a gravity displacement cycle for a load of wrapped linens. Which set of parameters should be selected?

Question 137

A wrapped set of instruments without lumens is scheduled for steam sterilization. The sterilizer is an older model that only supports gravity displacement cycles. What is the appropriate exposure temperature and time for this load?

Question 138

Which statement accurately describes the effectiveness of alcohol-based hand rubs?

Question 139

What minimum magnification range is recommended for inspecting instruments during assembly?

Question 140

Why must an ultrasonic cleaner solution be degassed before use?

Question 141

During inspection, a technician finds that a scalpel blade has a small chip in the cutting edge. What is the appropriate action?

Question 142

When testing a sharp instrument such as a scalpel blade, what safety precaution must be observed?

Question 143

A load of heat-sensitive devices is being prepared for ethylene oxide sterilization. What are the acceptable preconditioning parameters?

Question 144

After manual cleaning, which material is appropriate for drying instruments to prevent fiber shedding?

Question 145

When using chemical indicators in a washer-decontaminator, where should the indicator be placed to provide the most meaningful check of cycle conditions?

Question 146

Which of the following correctly describes a key difference between a pre-vacuum steam sterilizer cycle and a gravity-displacement cycle?

Question 147

A tabletop steam sterilizer uses a dynamic air removal cycle that alternately pressurizes and depressurizes the chamber to purge air. This cycle is known as:

Question 148

Before using a chemical for the first time, a technician needs to know if the work area requires special ventilation. In which section of the SDS would this information be found?

Question 149

At what concentration of ethylene oxide in air should the continuous gas monitoring system trigger an alarm and at what concentration should it initiate evacuation?

Question 150

When pushing a loaded case cart, what hand position minimizes strain on the arms and back?

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