More than two million such tests are carried out annually, but the WHO says they are unethical and lead to misdiagnosis and the mistreatment of patients.
The organisation’s review of these tuberculosis test kits says they give wrong results in around 50% of cases.
The kits are mainly sold in the developing world.
However, most of the 18 kits on the market are produced in Europe and North America.
According to Dr Mario Raviglone, the director of the WHO Stop TB Department, the tests must be banned.
He said: “A blood test for diagnosing active TB disease is bad practice. Tests are inconsistent, imprecise and put patients’ lives in danger.” —BBC News