If you suspect arsenic poisoning, the only reliable test is a urine analysis. You give a sample, and they look for the total amount of arsenic in your pee. (Side note: don’t eat seafood 48 hours before the test—certain fish like mussels or tuna contain non-toxic arsenobetaine, which will totally confuse the lab results. You’ll look like you’re dying when you’re just a sushi lover.)
But here’s the nuance: urine tests are great for recent exposure (last few days). For long-term poisoning, doctors might order a fingernail or hair sample test. Arsenic accumulates in keratin-rich tissues (nails, hair) over months. You can literally see it—dark bands across your fingernails called Mees’ lines. Creepy but useful, like a serial killer’s diary but for your health.
Detection test for Arsenic | chemical test for Arsenic | Arsenic metal
Face-to-Face with the Doctor
Okay, so you go to your GP. They’ll probably ask about your water source, job history (are you an antique ceramic collector? They use arsenic in old glazes), and diet. Don’t be shy—mention if you’ve been building a backyard sauna out of pressure-treated wood, because that stuff can leach arsenic. They might do a blood test, but that only shows exposure within hours, so don’t rely on it alone. Honestly? The water test is the MVP here.
If your urine arsenic level is above 50 μg/L, that’s a big flashing neon sign. But here’s where it gets weird: some people are "high metabolizers" who shed arsenic fast, so low levels can still be dangerous over time. That’s why doctors look at your whole picture—symptoms, exposure history, and test results. It’s a puzzle, not a pop quiz.
