Charles Toh Chai Soon (born 1930) is a Singaporean cardiologist who is regarded as the "father of cardiology" in Singapore.

Medical career In 1967, Toh founded the Coronary Care Unit of Singapore General Hospital.

Toh was the Chairman of the 1972 Asia Pacific Congress of Cardiology,US heart men for Congress New Nation, 8 July 1972, Page 2 https://eresources.nlb.gov.sg/newspapers/digitised/article/newnation19720708-1.2.22 at the time also having been the cardiologist of then-Prime Minister Lee Kuan Yew. He had also been a physician of Benjamin Sheares during Sheares's recovery from vascular surgery.

Toh was also the personal physician of Teh Cheang Wan, pronouncing Teh dead at 10.20 am, 14 December 1986.MINISTERIAL STATEMENT BY THE PRIME MINISTER, IN PARLIAMENT ON 26 JANUARY 1987 ON MR TEH CHEANG WAN'S DEATH. National Archive of Singapore.SINGAPORE GOVERNMENT PRESS STATEMENT. Release No. 33/DEC 14-1/86/12/14. https://www.nas.gov.sg/archivesonline/data/pdfdoc/812-1986-12-14/lky19861214.pdf

Public service Toh was appointed to the Public Service Commission in 1992.

Personal life Toh's son, Han Chong, is an oncologist and healthcare administrator.

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