what does a blood culture reveal
Guide. A blood culture is a test to find an infection in the blood. The blood does not normally have any bacteria or fungi in it. A blood culture can show what bacteria or fungi are in the blood.A bacterial infection in the blood, called bacteremia, can be serious because the blood can spread the bacteria to any part of the body.hy It Is Done. A blood culture is done to: 1  Find a bacterial infection that has spread into the blood, such as meningitis, osteomyelitis, pneumonia, a kidney infection, or sepsis. 2  A culture can also show what type of bacteria is causing the infection. 3  Find a fungal infection, such as yeast, in the blood.