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Central Sterile Technician interview questions, and how to answer them

A central sterile interview checks two things at once: whether you'll follow a reprocessing process exactly when nobody's watching, and whether you can keep the supply side moving while the OR keeps calling. Most managers care far more about how you think through a problem than about polished answers. Bring real examples, even small ones from a school externship or a stockroom job.

12 questions7 minute read

Part 1

1.What do you think a central sterile technician does all day?

Why they ask

People apply expecting a quiet packing job and quit when they hit decontam or the floor runs. The manager wants to know you've pictured the whole thing.

How to answer

  • Name the zones: decontamination, prep and pack, sterilization, sterile storage
  • Mention the distribution side: case carts, crash cart exchanges, restocking sterile supply rooms
  • Say you expect to rotate between them
  • Add one thing you've done or seen that's close, like a stockroom or an externship shift

2.A biological indicator from this morning's steam load comes back positive. What do you do?

Why they ask

This is the single scariest routine event in the department. They want to hear that you'd stop, escalate and follow the recall policy, not quietly rerun it.

How to answer

  • Tell the lead or supervisor right away
  • Pull the load record to see which trays were in it and where they went
  • Quarantine anything still in the department and follow the recall policy for anything already sent out
  • Take the sterilizer out of use until it's tested and cleared
  • Document every step on the load record

3.The OR calls because a tray opened with a wet pack. How do you handle the call and what happens next?

Why they ask

Wet packs are common and the call is often tense. They want to see you stay calm, get a replacement moving and look for the cause.

How to answer

  • Get a replacement tray or set to the room first, since the patient is waiting
  • Ask which tray, which sterilizer and roughly when it was run
  • Tell the lead so the load can be checked
  • Think about causes: cooling time, overloaded racks, heavy trays, wrapping
  • Follow up with the OR once you know what happened
4.You're halfway through assembling a big tray and a unit calls needing a crash cart replaced now. What do you do?

Why they ask

Central sterile is the version of this job where interruptions come from the floors, not just the OR. They're checking how you prioritize and whether you protect the half-built tray.

How to answer

  • A code cart is urgent, so it comes first
  • Stop the tray at a clean point and leave a note of exactly where you stopped, or hand it to a coworker
  • Swap the cart and bring the used one back for checking
  • Recount what you've already placed before finishing the tray
5.How would you build a case cart from a surgeon's preference card?

Why they ask

Case cart picking is a big part of the distribution side. A missed item on a cart can hold up a case as badly as a missing instrument.

How to answer

  • Read the card for the case, the surgeon and any notes on extras
  • Pull the instrument trays, peel packs and disposable supplies it lists
  • Scan each item into the tracking system and check expiration dates
  • Flag anything backordered or out for repair to the OR before the case, not during it

Part 2

6.What does event-related sterility mean to you when you're rotating stock on a floor?

Why they ask

Restocking sterile supply rooms is part of this title. They want to know you'll check packages, not just shelve them.

How to answer

  • A package stays sterile until something compromises it, like a tear, moisture or a crushed wrap
  • Check every package's integrity as you handle it
  • Rotate older stock to the front and pull anything with a manufacturer's expiration that's passed
  • Send anything questionable back for reprocessing instead of leaving it on the shelf
7.Walk me through cleaning a cannulated instrument, like a suction tip or a drill bit.

Why they ask

Lumens are where bioburden hides. They're checking that you know manual cleaning isn't optional just because a washer exists.

How to answer

  • Check the manufacturer's instructions for use first
  • Flush and brush the channel with the correct size brush, under water
  • Use the right detergent and soak time from the IFU
  • Rinse, then load it so the washer can reach the lumen, using a flushing port if there is one
  • Inspect it on the clean side with a lighted magnifier
8.How do you learn instruments you've never seen before?

Why they ask

Nobody knows every instrument when they start. They want someone who'll look it up instead of guessing.

How to answer

  • Check the count sheet and any photos in the tracking system
  • Ask a lead or experienced tech
  • Keep your own notes or flash cards of instruments you had to look up
  • Review them on breaks until they stick
9.A vendor drops off loaner trays late the night before a case. What do you do?

Why they ask

Late loaners are a constant headache and a common source of rushed, poorly processed sets. They want to hear you won't cut corners because of the clock.

How to answer

  • Check them in against the vendor's inventory sheet
  • Process them fully, starting in decontam, even if they arrive looking clean
  • Follow the vendor's IFU for cleaning and sterilization cycles
  • Tell the lead and the OR if timing means the tray won't be ready for the case
10.Tell me about a time you found a mistake someone else made.

Why they ask

In this department, catching errors is part of the job, and so is reporting them without drama.

How to answer

  • Give a real example, even from a non-hospital job
  • Say how you raised it and with whom
  • Explain how it got fixed
  • Mention what changed afterward, if anything

Part 3

11.How do you feel about working in decontamination for a full shift?

Why they ask

Decontam is hot, wet and physical, and plenty of new hires leave over it. The manager wants honesty.

How to answer

  • Say plainly that you know it's hot and heavy on PPE
  • Mention any physical or messy work you've done before
  • Show you understand why the gear and the process matter
  • Say you're fine rotating through it
12.Where are you with certification?

Why they ask

Many departments hire before certification but expect you to pass within a set window, and some states require it.

How to answer

  • Name the credential you hold or are studying for, like the CRCST
  • Say how you're logging hands-on hours if you're still working toward it
  • Show you know the rules depend on the state and the hospital

Questions to ask them

Ask at least two. It shows you're picking them too.

  • How is the shift split between reprocessing and distribution work like case carts and floor restocking?
  • Which instrument tracking system does the department use, and how do new techs learn it?
  • How long do new hires usually spend in decontam before rotating to the clean side?
  • What's the process when a tray goes to the OR incomplete or wet?
  • How does the department support people working toward certification?
Career guideWhat a Central Sterile Technician does, and what it pays
Read the guide →
Skills to learnCentral Sterile Technician skills: what to learn first
Read the roadmap →

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