Scotland's blood banks have less than a three-day supply of a universal blood group which can be given to anyone in an emergency.
The Scottish National Blood Transfusion Service (SNBTS) said its supply of the O Negative type is below half the ideal six-day stock it aims to have of all eight blood groups.
O Negative can be given to anyone in an emergency, and is the only safe option when a patient's blood group is not immediately available to medical staff.
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