Cost Per Use vs Cost Per Unit: What Actually Drives Your Continence Formulary Spend

You're staring at two quotes for the same category of continence product. One is $0.85 a pad, the other is $1.20. On paper, the first one looks like the obvious choice, and if you're working through a tight quarterly budget, it's tempting to lock it in and move on to the next line item.

But if that cheaper pad needs changing five times a day instead of three, and the more expensive one holds up for a full shift without a leak, you haven't actually saved anything. You've just moved the cost somewhere less visible, into staff time, laundry, skin integrity issues, and the products used to manage the fallout.

This is the core tension in continence formulary decisions, and it's one that trips up even experienced procurement teams. Unit price is easy to compare. Cost per use is what actually determines your real spend. Getting this distinction right is one of the most effective ways to bring genuine value into your continence budget, without compromising resident care.

What "Cost Per Unit" and "Cost Per Use" Actually Mean

These two numbers sound similar, but they answer completely different questions.

Cost per unit

Cost per unit is the straightforward line item price, what you pay for one pad, one pull up, one underpad. It's what shows up on a quote or an invoice, and it's the number most formulary comparisons default to because it's the easiest to compare across suppliers.

Cost per use

Cost per use is a broader calculation. It accounts for how many products a resident or client actually needs across a defined period, usually a day, to manage their continence needs adequately. A product that costs slightly more per unit but needs fewer changes per day, because it holds a higher volume or manages moisture better, can come out significantly cheaper on a cost per use basis.

The formula is simple in principle: total daily product cost divided by the number of residents or clients using that product category. The complexity comes from the variables that feed into it, absorbency level, fit, skin condition, mobility, and how consistently the correct size and type is being used in the first place.

Why the Cheapest Unit Price Can Cost You More

Unit price feels objective. It's a number on a purchase order, easy to benchmark against last quarter, easy to defend in a budget meeting. The problem is that it only tells you what you're paying, not what you're getting for it.

A facility that switches to a cheaper product line without adjusting for absorbency needs often sees change frequency creep up. More changes per day means more staff time spent on personal care tasks, more laundry, more products used across the same period, and in some cases, a higher risk of skin breakdown from prolonged moisture exposure. Every one of those consequences carries a cost, and none of them show up on the original purchase order.

This is exactly what tends to happen when a single, cheaper product is used across a whole cohort regardless of individual absorbency needs, rather than matching product selection to what each resident actually requires. The saving on paper quietly disappears once you account for the extra changes, the extra laundry, and the extra care time involved.

What Factors Affect Continence Cost Per Use?

To make a genuinely informed formulary decision, you need to look past the invoice and build a picture of total cost of ownership. A few factors matter most.

1. Change frequency

How many times per day does a resident or client actually need this product changed to stay dry and comfortable? A product with insufficient absorbency for the individual's needs will need changing more often, no matter how cheap the unit price is.

2. Fit and containment

Poor fit leads to leakage, and leakage leads to extra changes, extra laundry, and extra bedding or clothing replacement. It also increases the risk of moisture related skin damage, which can bring its own costs in wound care products and clinical time.

3. Skin integrity outcomes

Products that manage moisture well and maintain skin health reduce the likelihood of dermatitis and skin breakdown, both of which carry downstream costs in dressings, clinical review, and staff time that a unit price comparison simply doesn't capture.

4. Staff time

Every additional change is a task that takes a staff member away from other care duties. Multiply a small increase in daily changes across a full resident cohort, and the time cost adds up fast.

5. Delivery reliability and administrative time

A slightly higher unit price from a supplier with consistent stock and dependable delivery can work out cheaper overall than a lower price from a supplier prone to delays, which forces expensive, unplanned retail top ups or emergency orders.

When you add these together, the total cost of ownership for a product often tells a very different story to the unit price alone.

How to Build a More Cost-Effective Continence Formulary

Once you understand the difference between cost per unit and cost per use, the next question is how to apply that thinking practically when reviewing or setting a formulary.

1. Start with individual assessment

Matching product selection to each person's actual absorbency needs, rather than defaulting to one heavy duty option across the board, tends to reduce unnecessary product use while improving comfort and care outcomes at the same time.

2. Track change frequency

If you're only reviewing total dollars spent per month, you're missing half the picture. Comparing average changes per resident per day against product type gives you a much clearer signal of whether a product is genuinely performing.

3. Run a structured trial before switching formulary lines

Testing a new product across a representative sample, with change frequency and skin outcomes tracked over a set period, is the most reliable way to know whether it will actually reduce your cost per use before you commit to it at scale.

4. Audit regularly

A simple, periodic review of what's being used, how often, and whether it still matches each person's assessed need keeps your formulary aligned with real requirements rather than drifting toward whatever was ordered last time.

5. Consolidate where it makes sense

Suppliers with broad category coverage across continence, wound care, and other consumables can often offer better volume pricing across an account than fragmented purchasing from multiple smaller suppliers.

Getting Your Care Team on Board With a Cost Per Use Approach

Shifting a formulary decision away from unit price alone isn't just a procurement exercise, it's also a change in how your care team thinks about product selection day to day.

Frontline staff are often the first to notice when a product isn't performing, whether that's through more frequent change requests, skin integrity concerns, or feedback from residents and families. Building a simple, informal feedback loop between care staff and whoever manages procurement means formulary problems surface early, before they show up as a budget blowout at the end of the quarter.

It also helps to frame the conversation around outcomes rather than cost alone. A product that reduces change frequency and improves comfort is an easier internal sell than a straightforward request to spend more per unit, even when the two numbers ultimately mean the same reduction in total spend.

Why Clinical Need Should Come Before Cost

Cost per use analysis is a genuinely useful tool, but it should never override individual clinical need.

Product selection should always be guided by a proper continence assessment, taking into account mobility, cognitive function, skin condition, and the type and severity of incontinence involved. A product that looks efficient on a cost per use basis for one resident may be entirely wrong for another with different needs.

Formulary decisions should also leave room for exceptions. If a person's assessed needs fall outside the standard formulary range, that shouldn't be treated as a procurement failure, it's a normal and expected part of individualised care.

Finally, remember that skin integrity outcomes and dignity are not line items you can fully capture in a spreadsheet. A cost per use model should support better care decisions, not replace clinical judgement about what's genuinely right for the person in front of you.

Simplifying Continence Supply and Reordering

Even the best formulary strategy falls apart if the ordering and supply side is unreliable. Once you've settled on the right product mix for your cohort, the next challenge is keeping it consistently in stock without the admin burden of manually reordering for every resident or client.

This is where Platinum Health Supply's ordering platform, APEX, is built to help. For organisations managing continence supplies across multiple residents or clients, APEX lets you set up recurring orders once, select who each order is for at checkout, and keep every invoice, participant, and amount organised under a single account. There's no monthly reminder to set, no spreadsheet cross referencing to keep everything straight, and no risk of the wrong product going to the wrong person.

For support coordinators, facility teams, and allied health professionals juggling formulary decisions across many people at once, that structure matters. It keeps your procurement decisions traceable, keeps documentation ready for compliance review, and means account continuity holds even if the staff member who originally set it up moves on.

If you'd like a walkthrough of how APEX can support your formulary and reordering process, our team is happy to talk it through. Call 1300 604 499, or email customercare@phsgroup.com.au.

Look Beyond the Unit Price

Unit price will always be the easiest number to compare on a quote. But it's rarely the number that tells you what a continence product actually costs your organisation once change frequency, staff time, skin outcomes, and supply reliability are factored in.

A cost per use approach doesn't mean spending more for the sake of it. It means spending more accurately, matching the right product to the right person, and understanding the full picture before a formulary decision is locked in. Get that right, and you're not just protecting your budget, you're protecting the comfort, dignity, and skin health of the people your formulary decisions are actually about.