There exist many evaluation schemes of wastes in the legislation of various countries. According to these schemes, the hazardous properties of waste are assessed. For example, the evaluation of sixteen hazardous properties must be performed in the EU. They are:
C1: Explosive HP 1
C2: Oxidizing HP 2
C3:Flammable HP 3
C4: Irritant HP 4
C5: Specific Target Organ Toxicity/Aspiration Toxicity HP 5
C6: Acute Toxicity HP 6
C7: Carcinogenic HP 7
C8: Corrosive HP 8
C9: Infectious HP 9
C10: Toxic for Reproduction HP 10
C11: Mutagenic HP 11
C12: Produces toxic gases in contact with water, air or acid HP 12
C13: Sensitising HP 13
C14: Ecotoxic HP 14
C15: HP15 (capable of exhibiting a hazardous property listed above not directly displayed by the original waste)
C16: Persistant Organic Pollutants
From the above mentioned comes out, that evaluation of the risk of the wastes is a very complex system and in some cases more analyses are necessary. Everything depends on the waste legislation of a given country.
You look at the source of waste concrete. If it is from rocks, bricks that is okay but if it is from asbestos you need not to use it as it is hazardous.
It is better to check the constituents with corresponding tests. Many types of medical waste are considered hazardous. However, the majority of medical waste (85%) is not classified as hazardous. Examples of non hazardous medical waste include plastic packaging, clean glass and plastic, paper, cardboard, and office products.