Gram Stain of *Enterobacteriaceae* Bacteria (Qualitative Blood Culture Probe)

What This Test Measures

A Gram stain is a simple microscopic test that helps identify the type of bacteria present in your blood. It involves staining bacteria with dyes to distinguish between Gram-positive (purple) and Gram-negative (pink/red) bacteria. This test specifically targets *Enterobacteriaceae*, a family of bacteria that can cause serious infections.

Why It’s Done

Your healthcare provider may order this test if you have symptoms of a blood infection (sepsis), fever of unknown origin, or other signs of bacterial infection. It helps confirm whether the bacteria causing your symptoms belong to the *Enterobacteriaceae* family.

How It’s Performed

A blood sample is taken from a vein, typically in your arm. The sample is then processed in a blood culture probe, where bacteria are identified using a Gram stain technique. Results are qualitative (positive or negative) rather than quantitative.

What the Results Mean

Positive results indicate the presence of *Enterobacteriaceae* bacteria in your blood. This finding supports the diagnosis of a bacterial infection and guides further treatment, such as antibiotics. Negative results mean no detectable bacteria of this type were found in the sample.