#654 1979 · Eric Brodheim (New York Blood Center) & Gregory Prastacos (Wharton) — Long Island regional blood program · Healthcare logistics / blood banking
Long Island's hospitals gave up hoarding their own blood and let an algorithm treat the region as one shared supply
问题
Every hospital keeping its own safety stock of blood was wasting a quarter of the nation's supply
背景
Blood is perishable — a unit of whole blood or red cells lasts 21 days — and both its supply (donations) and demand (transfusion requests) are random, with wildly different volumes at every hospital in a region. Through the 1970s, the standard U.S. practice was decentralized: each Hospital Blood Bank called its Regional Center every morning and ordered enough units to bring its own inventory up to a 'safe' level, typically 2-3 days of stock for common blood types and 7-10 days for rarer ones, competing with every other hospital in the region for the Center's limited supply.
A 1971 national survey found this local-safety-first system was outdating — discarding past the 21-day shelf life — 25% of the blood collected across the country, while hospitals simultaneously reported shortages frequent enough to postpone elective surgery. The two failures were happening at once, region by region, because every hospital acting to protect its own patients was, in aggregate, wasting the shared regional supply that protected everyone's patients.
换别人会怎么做
Every hospital keeping its own safety margin looks like the responsible choice — hold 2-3 days of stock (7-10 for rare types) so you are never caught short, and treat any resulting waste as an acceptable price for not turning away a bleeding patient. Applied by every hospital in a region independently, that same reasonable caution was exactly what produced the 25% national outdating rate: one hospital's safety margin was another's wasted blood.
他们看到了什么
Shortage and waste are not opposite ends of a dial each hospital tunes for itself — they are a regional accounting problem in disguise. Because units of the same blood type are interchangeable between hospitals, one hospital hoarding stock does not just fail to help a nearby shortage, it actively causes it, by starving the shared pool both hospitals are really drawing from.
那一手
Brodheim and Prastacos replaced the call-in ordering system for the roughly 38 hospitals of the Long Island region with a centralized, computer-scheduled distribution system. Instead of each hospital privately deciding its own buffer, the Regional Center's model calculated a prescheduled delivery to every hospital designed to equalize the probability of a shortage AND the probability of an outdate across all hospitals simultaneously — a policy Prastacos proved mathematically minimizes both failure modes at once, and, unlike every decentralized approach before it, does not require ever estimating the (notoriously disputed) relative cost of a shortage versus a wasted unit.
为什么管用
Centralizing the decision lets the Regional Center see what no individual hospital can: everyone's inventory and everyone's demand pattern at once. Rather than setting local inventory targets that require guessing the relative cost of a shortage versus a wasted unit — a number the field could never agree on, with published estimates varying widely — Prastacos proved that the one schedule which equalizes the probability of shortage and the probability of outdating across every hospital simultaneously also minimizes both region-wide, without ever needing that cost tradeoff at all.
值了多少
Run as a routine, centrally scheduled operation rather than 38 separate daily negotiations, the system, by its developers' own account, 'drastically reduced' both shortages and outdating in the Long Island region relative to the roughly 25% national outdating rate the decentralized approach had been producing. The work won Brodheim and Prastacos the 1979 International Management Science Achievement Award, the field's top prize for a practice application of operations research.
什么时候会失灵
It depends on units being genuinely interchangeable across nodes: the paper itself notes rarer blood types still needed 7-10 days of local buffer because there often wasn't enough regional supply to pool effectively. It needs a center with real scheduling authority over what would otherwise be autonomous local decision-makers, and transport reliable enough that a pooled unit still has useful shelf life left when it reaches the hospital that needs it. And it requires hospitals to cede local control over their own ordering — a governance concession as much as a technical one, which a network of independent actors may resist even once the math is proven.
后来呢
Prastacos's own 1980 review of the field describes Long Island as the prototype that the subsequent shift toward centralized regional blood management was built on, and the underlying allocation model — equalize risk across nodes rather than estimate a shortage/waste cost tradeoff — was formalized the following year as a decision-support tool (PBDS) published in Management Science and cited across the blood-supply-chain literature since.
资料来源
- [1]Blood-Management Systems: An Overview of Theory and Practice (IIASA Professional Paper PP-80-1)International Institute for Applied Systems Analysis, 1980pure.iiasa.ac.at
- [2]The Long Island Blood Distribution System as a Prototype for Regional Blood Management (doi:10.1287/inte.9.5.3)Interfaces (INFORMS), vol. 9, no. 5, pp. 3-20, 1979doi.org