Culture and Sensitivity Aerobic (Blood) Test

Detect and identify the specific bacteria causing an infection with the Culture and Sensitivity Aerobic (blood) test. This test involves collecting a blood sample and growing a culture to determine which bacteria are present and test their susceptibility to various antibiotics.

How the Test Works?

• A small sample of blood is collected by a phlebotomist through a needle inserted into your vein. Proper sterile technique prevents contamination.
• The blood sample is inoculated directly onto culture media plates optimized to grow aerobic bacteria.
• The cultures are incubated for 24–72 hours to allow any bacteria present to multiply.
• If growth occurs, the bacteria are identified through Gram staining, biochemical testing, and other methods.
• Antibiotic susceptibility testing determines which medications effectively stop the growth of the identified organism.
• A detailed lab report indicates the specific bacteria detected and their antibiotic resistance or susceptibility profile.

When Recommended?

A culture and sensitivity blood test may be ordered if:

• A bacterial blood infection or sepsis is suspected based on symptoms.
• The source of a fever is unknown.
• Infection persists despite antibiotic treatment.
• Guidance on choosing targeted antibiotic therapy is needed.
• Complications or unexplained symptoms indicate infection may have spread to the blood.
• Immunocompromised patients develop signs of infection.

Early detection and identification of blood-borne bacteria enables selection of the most appropriate antibiotic to treat the organism and prevent worsening infection.

Preparing for the Test

• No special preparation is needed.
• Let your doctor know if you have bleeding disorders or are taking blood thinners.
• Avoid using antibacterial soaps or creams before the test which could inhibit growth.
• Be prepared to provide information on your symptoms and medical history to help interpret results.
• Inform the technician of any allergies or previous problems with blood draws.

Understanding Your Results

• Detection of pathogenic bacteria in your blood confirms a spreading infection requiring prompt, targeted antibiotic treatment guided by the sensitivity results.
• Normal culture results help rule out a blood infection. Your doctor will continue investigating other potential causes of your illness based on your symptoms.
• Contamination may occasionally lead to incorrect results. Repeat testing may be needed if findings don’t correlate with your clinical presentation.

Discuss your results with your doctor to determine next steps for treating any identified infection or continuing the diagnostic process. Timely, appropriate treatment of bacteria found can greatly improve prognosis in bloodstream infections.