Alexis Frank Hartmann Sr. (October 30, 1898 – September 6, 1964) was an American pediatrician and clinical biochemist.
His parents were Henry Charles Hartmann, a general practitioner, and Bertha Hauck Griesedick; both were of German ancestry.
While he was a medical student, he developed a new technique to test blood sugar levels.
[3] His scientific work pertained to biochemistry and problems of metabolism, while his clinical pediatric interests included anoxia, hypoglycemia, nephritis, nephrosis and chemotherapy.
He modified Ringer's solution by adding sodium lactate, an alkaline substance, to treat acidosis in children.