Match absorbency tiers to patient mobility, not price. The four tiers, the ISO 11948 test numbers to specify, and how to trial the tiering on a ward.
Hospital absorbency tiers run light through overnight, matched to patient mobility rather than to price. Specify capacity to ISO 11948-1, strike-through and rewet to ISO 11948-2, then set change frequency by tier so skin stays dry without over-using product.
Absorbency is the one specification in continence care that directly changes clinical outcomes. Buy too light and skin breaks down; buy too heavy and you waste budget on capacity nobody uses. Getting the tiering right is the highest-value decision a hospital makes about adult diapers. It applies equally whether you are specifying for one ward or running adult diapers for hospital pharmacy wholesale supply across a whole network.
The four tiers, and who they are for
Light suits ambulatory patients with occasional leakage who manage their own changes. Moderate covers chair-bound patients needing assistance. Heavy is for bedridden patients and overnight. Overnight adds capacity for an eight-hour stretch without a change. Mapping tier to patient mobility rather than to department is what reduces both spend and skin problems. It is also the specification hospitals most often get wrong when they first standardise adult diapers.
| Tier | Typical capacity | Patient profile |
|---|---|---|
| Light | Up to about 1000 ml | Ambulatory, self-caring |
| Moderate | Roughly 1000-1800 ml | Chair-bound, assisted |
| Heavy | Roughly 1800-2500 ml | Bedridden, high output |
| Overnight | 2500 ml and above | Uninterrupted night stretch |
The three test numbers that matter
Capacity alone is the easiest number to quote and the least useful. Ask for all three. Total capacity, measured to ISO 11948-1. Strike-through time, which is how fast fluid leaves the surface through the acquisition layer. And rewet, sometimes called wetback, measured to ISO 11948-2, which tells you how much returns to the skin under pressure ISO standards. A product with high capacity but slow strike-through leaks at the leg long before it is full.
Construction behind the numbers
Capacity comes from the core: wood pulp fluff plus superabsorbent polymer, with heavy tiers using a higher SAP ratio and often a dual-core construction to spread fluid. The acquisition layer sits between topsheet and core and does the fast work. Standing leg cuffs contain what the core has not yet absorbed. When you specify adult diapers for hospital pharmacy wholesale supply, specify all of these, not just the millilitre figure.
Set change frequency by tier
Product matching only works if the ward follows it. A heavy brief changed too rarely fails just as a light one does. Published continence guidance and infection prevention advice from bodies such as the CDC and CMS frame skin integrity as a quality outcome CDC CMS, which is why most facilities write change intervals into protocol rather than leaving them to discretion.
Trial it before you standardise
Run the tiering on two wards for three weeks and measure three things: changes per patient per day, product waste, and any skin observations. That data converts a clinical argument into a financial one, which is what a value analysis committee needs. The nursing home procurement guide covers the long-term-care version of the same logic.
Frequently asked questions
How do I choose between moderate and heavy?
Match to mobility and output, not to department. Chair-bound assisted patients usually sit in moderate; bedridden or high-output patients need heavy or overnight.
Is higher capacity always better?
No. Over-specifying costs money and adds bulk. Under-specifying causes leaks and skin damage. Match the tier to the patient.
Why does a high-capacity product still leak?
Usually slow strike-through or poor leg-cuff fit. Fluid pools on the surface and escapes before the core fills.
Which standard should I cite in a tender?
ISO 11948-1 for capacity and ISO 11948-2 for rewet, with strike-through time stated separately.
Related reading: hospital procurement, formulary and SKU control, nursing home procurement guide, and our adult diapers page.
