Memory sites toward clinically relevant creatinine have been imparted in polymers based on methacrylic acid, AT-vinyl pyrrolidine, and 2-hydroxy ethyl methacrylate by the technique of molecular imprinting. The polymers are subjected to interaction with creatinine and creatine, a molecule of close resemblance with creatinine. The results show that selectivity is largely governed by the nature of the monomer. The reusability of the polymer is also demonstrated.