Prenatal check-ups need to involve both the man and the woman, mainly because the physical condition of the man and the woman can affect the health of the fetus. Men who suffer from certain sexually transmitted diseases, such as syphilis, tuberculosis, hepatitis B and AIDS, can also infect the woman. Secondly, blood tests for men are also needed to rule out the genes for certain genetic diseases and to achieve eugenics. Some hospitals may take blood to check the liver and kidney function of the male, which is mainly to do an assessment of his whole body. This is mainly to assess his general condition as it may affect the quality of his semen.