Dr Dana Brems, a podiatrist in Los Angeles, revealed on TikTok how a simple finger test can show if you’re dehydrated. The method, dubbed the Skin Turgor Test, measures skin’s elasticity. Dr Dana Brems, a podiatrist in Los Angeles, revealed on TikTok how a simple finger test can show if you’re dehydrated. The method, dubbed the Skin Turgor Test, measures skin’s elasticity.