1. Describe the NBS supply chain and How critical is stock-outs in the operations of UK’s NBS?

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No inventory manager likes to run out of stock. But for blood services, such as the UK’s 
National Blood Service (NBS) the consequences of running out of stock can be particularly 
serious. Many people owe their lives to transfusions that were made possible by the efficient
management of blood, stocked in a supply network that stretches from donation centres through 
to hospital blood banks. The NBS supply chain has three main stages:
1. Collection, which involves recruiting and retaining blood donors, encouraging them to 
attend donor sessions (at mobile or fixed locations) and transporting the donated blood to 
their local blood centre.
2. Processing, which breaks blood down into its constituent parts (red cells, platelets and 
plasma) as well over twenty other blood-based ‘products’.
3. Distribution, which transports blood from blood centres to hospitals in response to both 
routine and emergency requests. Of the Service’s 200,000 deliveries a year, about 2,500 are 
emergency deliveries 

Inventory accumulates at all three stages, and in individual hospitals’ blood banks. Within the 
supply chain, around 11.5 per cent of donated red blood cells are lost. Much of this is due to 
losses in processing, but around 5 per cent is not used because it has ‘become unavailable’, 
mainly because it has been stored for too long. Part of the Service’s inventory control task is to 
keep this ‘time-expired’ loss to a minimum. In fact, only small losses occur within the NBS, 
most blood being lost when it is stored in hospital blood banks that are outside its direct control. 
However, it does attempt to provide advice and support to hospitals to enable them to use blood 
efficiently. Blood components and products need to be stored under a variety of conditions, but 
will deteriorate over time. This varies depending on the component; platelets have a shelf life of 
only five days and demand can fluctuate significantly. This makes stock control particularly 
difficult. Even red blood cells that have a shelf life of 35 days may not be acceptable to hospitals
if they are close to their ‘use-by date’. Stock accuracy is crucial. Giving a patient the wrong type 
of blood can be fatal.

At a local level, demand can be affected significantly by accidents. One serious accident 
involving a cyclist used 750 units of blood, which completely exhausted the available supply 
(miraculously, he survived). Large-scale accidents usually generate a surge of offers from donors wishing to make immediate donations. There is also a more predictable seasonality to the 
donating of blood, however, with a low period during the summer vacation. Yet there is always 
an unavoidable tension between maintaining sufficient stocks to provide a very high level of 
supply dependability to hospitals and minimizing wastage. Unless blood stocks are controlled 
carefully, they can easily go past the ‘use-by date’ and be wasted. But avoiding outdated blood 
products is not the only inventory objective at NBS. It also measures the percentage of requests 
that it was able to meet in full, the percentage emergency requests delivered within two hours, 
the percentage of units banked to donors bled, the number of new donors enrolled, and the
number of donors waiting longer than 30 minutes before they are able to donate. The traceability 
of donated blood is also increasingly important. Should any problems with a blood product arise, 
its source can be traced back to the original donor. 

1. Describe the NBS supply chain and How critical is stock-outs in the operations of UK’s NBS? 

 

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