Steam vs Ethylene Oxide Sterilization by Price Was My Costliest Mistake

Eight years into medical procurement, I've got one rule: price is a fact, but value is a conclusion. If you're comparing steam vs ethylene oxide sterilization only by the per-load price, stop. In 2022, I tried to save money by splitting instrument sterilization between two specialty vendors—one steam-only, one EtO-only. The split quotes came to $77,000. The single-vendor bid for both methods was $96,000. By the end of the contract year, my "smart" approach had cost us $115,000. That's $19,000 more than the option we called expensive—and that doesn't count the delayed surgery cases.

I'm not saying competitive bidding is bad. I'm saying that comparing only the quote line is dangerous. Over eight years of medical purchasing, I've made and documented fourteen major mistakes, totaling roughly $96,000 in wasted budget. I now maintain our team's checklist to prevent other people from doing the same. The checklist works on sterilization contracts, on medical devices, and even on items that look unrelated, like a medical imaging system or a hearing aid programmer.

What actually happened

The decision started with an honest operational problem. Our surgery center had two types of reusable instruments.

One type was standard metal instruments—forceps, retractors, trays—that can go through steam sterilization, which is quick and reliable. The other type had lenses, seals, or plastic components that would be damaged by high heat. These required ethylene oxide (EtO) sterilization. EtO is a low-temperature process, but it has a longer cycle and a mandatory aeration phase. Not every vendor can run both modalities efficiently.

We got quotes from two contract sterilizers. One could handle both steam and EtO, but it looked expensive: $96,000 for the year. The other two were more specialized: one steam company quoted $41,000; one EtO company quoted $36,000. Total $77,000. In my head, that was an easy decision: I can buy each method from the vendor that does it best. (This was in 2022, before I learned to count fixed costs.)

I knew we should check the vendor's pickup schedule and minimum quantities before signing, but I thought, "What are the odds that detail matters enough to erase $19,000?" The odds caught up with me quickly.

From the outside, using specialist vendors looks like smart sourcing. The reality is that every additional vendor creates unseen fixed costs. We ended up paying for duplicate qualification loads, two quality audit processes, and transport to two separate facilities. Because the EtO vendor had fixed days and longer aeration times, we had to rent extra instrument trays. We also paid overtime for staff to chase couriers and match invoices. I left those costs out of the original comparison.

• Duplicate validation and quality documentation: $8,500
• Extra freight because of two locations: $6,000
• Rental instrument sets to cover schedule gaps: $16,500
• Additional internal labor and invoicing: $7,000

Total hidden extras: $38,000. That's how a $77,000 "savings" turned into a $115,000 loss against the so-called expensive single-vendor quote.

Steam vs EtO is not a two-column comparison

Here's what I missed: steam sterilization is cheap and fast, but not every device tolerates it. EtO is necessary for many heat-sensitive and single-use devices, but the longer cycles affect how much backup inventory you need. The right method isn't the cheaper method. It's the one that fits the actual devices and the actual clinical schedule.

The quote tells you what a vendor will charge. It doesn't tell you whether your trays can be turned around in time, whether your clinicians can stay productive, or whether your quality department can handle an extra vendor. None of those costs show up on the first line of an invoice.

It took me about four years and roughly 300 purchase orders to understand that "best value" is context-dependent. The same product can be a great value in one hospital and a terrible value in another, depending on sterilizer access, storage space, patient population, and staff training. That's why I now get cautious when a purchasing committee tries to select a vendor by unit price alone.

How this changed my Coloplast product catalog orders

I manage procurement for a network that includes ostomy and continence clinics. I've bought a lot of Coloplast medical devices ostomy care lines, and the Coloplast product catalog is a good place to start because it gives clear codes and IFU information. But the catalog is not the whole story. When a cheaper substitute is proposed, I now ask to see much more than the price: the sterilization claim, shelf life, packaging dimensions, patient education material, and clinical support. What I'm really calculating is whether a small unit-price saving will disappear if product performance changes.

In our setting, a product that fails earlier or fits poorly can create extra nursing visits, more waste, and lower patient confidence. Those costs are not in the vendor's quote. They show up later, in ways that are harder to measure but just as real.

The same pattern shows up everywhere

I've seen the same pattern with a medical imaging system. A lower upfront price won the review, but the excluded service contract removed nearly all the savings when a probe needed repair fourteen months later. I've also watched a hearing aid programmer decision get made for its low retail price, without checking whether it worked with the clinic's existing software. The retraining and reprogramming time made it more expensive than the model we originally ruled out.

None of this is unique to sterile processing. Whenever a colleague asks me to look at a new product, I run a mini-TCO: total cost of ownership.

1. What is the total annual cost, not just the unit price?
2. What fixed costs come with adding or switching suppliers?
3. What sterilization, handling, or reprocessing requirements are in the IFU?
4. What workflow changes will follow—training, service contracts, inventory levels?
5. What is the cost if it fails, in delayed cases, complications, or wasted clinical time?

Since creating that checklist, our team has caught 47 potential errors in the past 18 months. Some were simple copy-paste mistakes. A few would have been very expensive.

Don't take this as "always buy the expensive option"

I don't want anyone to misinterpret this as a rebranding of high-priced procurement. There are plenty of cases where steam sterilization is the clear right answer—simple metal instruments with fast turnaround needs, for example. There are also cases where a lower-price substitute is genuinely equivalent; if so, it should win.

The goal is not to ignore price. The goal is to include every cost that follows the product into your building. If a vendor can't tell you how their product will behave after sterilization, during storage, or through its full life cycle, that uncertainty is also a cost—even if it doesn't show up on the quote.