PEOPLE across the Keighley district are being urged to give blood.
NHS Blood and Transplant says there is a desperate need for donors.
An amber alert issued in July due to severely low stocks of O negative blood remains in place.
Just eight per cent of the population has O negative, but because it is used for all patients in emergencies or where blood type is unknown, it accounts for around 15 per cent of the stocks needed by hospitals.
Mark Chambers, for NHS Blood and Transplant, says: "The NHS remains in urgent need of certain blood types.
"People with O negative and B negative blood are urged to come forward.
"We also require additional donors from the black community because they are more likely to have the blood type used to treat people living with sickle cell. The NHS currently only has enough donors to supply half the amount of blood that hospitals need for sickle cell patients – the rest has to be substituted with O negative."
Blood donor centres include Victoria Hall in Keighley.
For more details about giving blood and to book an appointment, visit blood.co.uk, use the GiveBlood app or call 0300 123 23 23.
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