On Assignment Inc. (NASD: ASGN), a Calabasas, Calif.-based life sciences, healthcare and technology staffing company, reported revenue rose 33.5 percent in the fourth quarter to $161.8 million from $121.2 million in the year-ago quarter.

Fourth-quarter revenue rose by the double digits in all the company’s business lines:

• Life sciences, up 32.5 percent to $40.9 million
• Allied healthcare revenue rose 20.9 percent to $12.2 million
• Travel nurse revenue rose 62.1 percent to $13.8 million
• Physician staffing, up 35.4 percent to $23.7 million
• Information technology and engineering, up 31.4 percent to $71.2 million

Fourth-quarter gross margin narrowed to 33.1 percent from 34.9 percent a year ago.

Net income jumped to $7.5 million from losses of $13.7 million in the fourth quarter of 2010, which included a $15.4 million charge for impairment of goodwill.

For the full year ended Dec. 31, 2011, On Assignment posted revenue of $597.3 million, a 36.3 percent increase from revenue of $438.1 million in 2010.

Full-year gross margin was 33.5 percent, compared to 34.1 percent in 2010.

Full-year net income was $24.3 million, compared to a net loss of $9.9 million in 2010.

On Assignment Inc. (NASD: ASGN)
For the quarter ended Dec. 31, 2011, compared with the year-ago quarter
Revenue: $161.8 million, +33.5 percent
Net income: $7.5 million vs. net loss of $13.7 million

For the full-year ended Dec. 31, 2011, compared with the previous year.
Revenue: $597.3 million, +36.3 percent
Net income: $24.3 million vs. a net loss of $9.9 million