A disposable tourniquet and its method of use is disclosed. The tourniquet is in the form of a band formed of a thin flexible, non-stretchable material and has releasable securable means, e.g., a pressure sensitive adhesive. The tourniquet is arranged to be wrapped around the patient's limb, tightened and locked in place to reduce circulation. The tourniquet has means for controlling the amount of tension applied to the band when it is tightened about the limb of the patient, means for indicating the amount of tension applied. Means for indicating the ambient temperature at the patient's limb on which the tourniquet is used may be included in the tourniquet. The tourniquet may also include means to enable it to be folded into a compact configuration. Plural tourniquets can be provided in the form of a stack.