Mycobacterial Strain Identification by Subtyping (Genotypic)

Why This Test Is Done

Doctors may order this test if you have symptoms of a mycobacterial infection (e.g., persistent cough, fever, weight loss) and a culture confirms the presence of *Mycobacterium* bacteria. It’s also used in public health investigations to track spread or resistance to treatments like rifampin.

How the Test Works

The test analyzes genetic material (DNA) from a sample of your infection, often from a sputum, blood, or other bodily fluid. Advanced techniques like **genotyping** (e.g., spoligotyping, MIRU-VNTR, or whole-genome sequencing) compare your strain’s DNA sequence to a database of known strains to determine its exact type.

Sample Collection and Preparation

You’ll provide a sample (e.g., sputum, urine, or blood) that’s been cultured to grow the bacteria. The lab then extracts DNA from the bacteria and runs it through specialized tests to identify its genetic fingerprint.

What to Expect After the Test

Results typically take weeks, as they require genetic analysis and comparison to reference databases. Your doctor will discuss the findings and how they affect your treatment plan.