The following sentence explains the basic aim of Ayurveda.
“Swasthasya Swasthya Rakshanam; Atursya Vikar Prashamanam”
This means: “Preservation to health of healthy person is treating ailments with breaking causative factors of pathogenesis”.
The prakruti is a guideline to natural state and potential. The emotion and perception tends to fluctuate more than the physical characteristics do, and you need to take the test multiple times to get a true picture. In Ayurveda, a physician would take pulse three times before determining the prakruti.