Med

First described by von Wucherpfennig in 1931.

In accordance with the exponential progression of the UV reaction on the skin, a series of previously non-UV exposed test fields (5-8 small areas on the buttocks or back) are exposed to geometrically or arithmetically increasing irradiation times or energy quantities to determine the MED-UVB and MED-UVA and read and evaluated according to the above definition. Information on normal values or reference ranges for MEDs must always be seen strictly in the context of the methods used; in particular, the irradiation spectra used are of crucial importance. A comparability of MEDs based on different irradiation sources can be achieved by conversion to the standard erythema dose (SED).