His doctoral thesis, The Acid-Base Status of the Blood, was published as a book for five editions and in five languages. He was honored by the American Association for Clinical Chemistry who awarded him the Edwin F. Ullman Award in 2003.
^Siggaard-Andersen, Ole; Engel K (1960). "A new acid-base nomogram. An improved method for the calculation of the relevant blood acid-base data.". Scan J Clin Lab Invest12: 177–86. doi:10.3109/00365516009062420. PMID13848805.