Pretorian Labs

What Do Urine Drug Test Results Actually Mean?

A positive result on a urine drug test isn't always as straightforward as it sounds — and a negative result doesn't always mean what you think it does.

Urine drug testing happens in two stages. First, an immunoassay screen gives a quick presumptive result. But screens can cross-react with certain medications and supplements, which is why presumptive positives are confirmed with a second, more specific method — typically mass spectrometry — before any clinical decisions are made.

Understanding that distinction matters. A screen is a starting point, not a final answer. Confirmation testing is what separates a reliable result from a guess.

At Pretorian Labs, every positive screen is confirmed before it leaves our lab — because your patients deserve results you can act on with confidence.

Have questions about how we report drug test results or what confirmation testing involves? Drop a comment or send us a message — we'd love to connect!

🧬 **What Does PCR Testing Actually Detect?**

PCR testing has become a household term over the last few years — but what's actually happening in the lab when a sample gets tested?

PCR, or polymerase chain reaction, works by detecting the genetic material of a pathogen rather than your body's response to it. That distinction matters. It means we can identify the presence of a virus, bacteria, or fungus directly — often earlier and more precisely than traditional methods.

At Pretorian Labs, our molecular team uses PCR to give providers the kind of clarity that leads to better, faster treatment decisions.

💬 Curious about what's included in our molecular panels? Send us a message or drop a comment — we'd love to connect!