A method for purifying GLA-domain coagulation proteins, includes the following steps: a) bringing a sample containing one or more GLA-domain coagulation proteins into contact with an affinity substrate on which nucleic aptamers which bind specifically to the GLA-domain coagulation proteins are immobilized, in order to form complexes between (i) the nucleic aptamers and (ii) the GLA-domain coagulation protein(s), b) releasing the GLA-domain coagulation protein(s) from the complexes formed in step a), and c) recovering the GLA-domain coagulation protein(s) in a purified form.
