Cytomegalovirus (CMV) Blood Culture (Qualitative) with Subculture

What This Test Measures

The test detects whether CMV is present in your blood by growing a sample in a controlled environment. If CMV is growing, it will be identified through microscopic examination or other lab methods. This is a qualitative test, meaning it only tells you if the virus is present or not, not how much.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or organ issues that could be caused by CMV, especially if you have a weakened immune system (e.g., due to HIV, chemotherapy, or other conditions). It’s also used to monitor people who have received organ transplants or are on certain medications that suppress the immune system.

What to Expect

The blood sample is taken from a vein, similar to other blood draws. The sample is sent to a lab where it’s grown in special media to see if CMV grows. Results can take several days to weeks, as it requires careful observation of the sample for signs of viral growth.

Common Reasons for Positive Results

A positive result means CMV was detected in your blood. This could happen if you’re actively infected, especially if your immune system is compromised. It doesn’t always mean you’re sick right away, but it’s important to discuss with your doctor to determine next steps, such as further testing or treatment.