Trousseau sign of latent tetany is a medical sign observed in patients with low calcium.[1] From 1 to 4 percent of normal patients will test positive for Trousseau's sign of latent tetany.[2] This sign may be positive before other manifestations of hypocalcemia such as hyperreflexia and tetany, as such it is generally believed to be more sensitive (94%) than the Chvostek sign (29%) for hypocalcemia.[3][4]