Suprapubic aspiration was easily performed in a group of 32 mentally retarded children, and it obviated the difficulties with contamination inherent in bag urines. Supra-pubic aspiration is a valuable tool in the diagnosis and follow-up of urinary tract infections that may arise in mentally retarded children.
Ellis DR, Tischler B, Lirenman DS. Suprapubic Aspiration of Urine in the Mentally Retarded Child. Am J Dis Child. 1970;120(3):237–240. doi:10.1001/archpedi.1970.02100080121011