Helen Murray Free, developed with her husband the first dip-and-read diagnostic test for diabetes – obituary
Helen Murray Free with her husband and scientific collaborator Alfred in 1955 Credit: BAYER Helen Murray Free, who has died aged 98, was the co-developer, with her husband Alfred Free, of Clinistix, the first dip-and-read diagnostic test for diabetes and for monitoring glucose levels in urine, an achievement that revolutionised diagnostic testing. Before the introduction of Clinistix in 1956, laboratory technicians tested for diabetes by adding a reagent to urine in a test tube and then heating the mixture over a Bunsen burner, a process that was not only cumbersome but also imprecise beca...