Massachusetts’ workforce has the nation’s highest concentration of jobs in biotechnology, medical technology, and other life sciences fields, according to a report released Wednesday.

More than 113,000 people in the state work in life sciences, making the sector about as big as the state’s construction industry.

The biggest chunk of life sciences workers, more than 45,000, are in research and development. Thousands more work at manufacturers, universities, and hospitals, according to the Northeastern University report.