Measuring Parkinson's Disease Progression

"At least 1 hour after 200mg carbidopa p.o., each subject will receive an intravenous solution of levodopa in saline at a rate based on age and body mass according to the final dose described in Black et al 2003.The total dose for a 70-year-old, 70kg subject will be approximately 65mg.~Subjects with untreated PD will then take 6 ± 1 weeks of clinically dosed oral carbidopa-levodopa tablets for clinical purposes and then repeat the carbidopa plus intravenous levodopa dose as above."