Abstract
A detecting method for blood is provided. The method includes the following steps. A sensing device including a base and at least one response electrode is provided, wherein the response electrode is spaced apart from a gate end of the base. The blood including red blood cells and targets is disposed on the response electrode. The blood is separated into a first part and a second part, wherein the first part is in contact with the response electrode, and the number of blood cells in the first part is lower than that in the second part. A pulse voltage having a tunable pulse width and a pulse height is applied on the electrode, causing in an electric field between the response electrode and the gate end of the base, and a detection current which generates from the base in pulse width is measured to detect a characterize of the targets.