How does one check if you have good circulation in fingers. What home test can u do to detect that...

Cap refill. Press on your fingernail...Nailbed should turn white then pink within 1-2 seconds.
Finger circulation . Is assessed with a combination of several things color temperature turgor meaning how filled the fingertips are capillary refill ie how quick the color returns after pressure, an allen's test assessing the radial and ulnar artery, but the best quick assessment is assume try or a difference from a finger neighbor or what is perceived to be the normal state in each person.