House nods. He reaches for a latex tie and ties off his upper arm. "What you're going to do, is find a vein." He tapped his inner elbow. He'd self medicated with an IV before, though he couldn't say he'd ever taken his own blood.

"And then, you stick the needle in, carefully." He runs a cotton swab over his arm. "Just like this," He shows her, biting his bottom lip in concentration as he slid a clean, fresh needle into his arm. Blood started flowing through the tubing and into a small vial.

"See? Not so difficult." He tugged the needle out of his arm and released the tie.