Dr Godfrey and his assistant drawing six oz of blood, using an IV container.
The blood passes through this flat piece which is placed under the light as it goes back into his body.
As the container empties, it leaves these bubbles behind which will be a consistent pattern by the time the ten sessions are finished.
Mr D waiting the ninety minutes it takes for the blood to drip back through the IV and back into his body.
I'll keep updating on this as it happens.