Scope and Contents Used for estimating the amount of albumen in urine. Comprises graduated glass tube, plastic cover and white base. This method of bedside testing of protein in urine was still in use in the Rosie until 1992. Over 40 years earlier it had been widely dismissed as too inaccurate for clinical use even in the hands of skilled lab. Staff, particularly for the amount of protein in urine in pregnancy. Surprisingly, Esbach tubes continued on sale for ages (in common with other obsolete...