minimal erythema dose


Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
Related to minimal erythema dose: Minimum erythema dose

minimal erythema dose

minimal erythema dose

, minimum erythema dose Abbreviation: MED
The shortest exposure to ultraviolet radiation that produces reddening of the skin within 1 to 6 hr and disappears in 24 hr. The minimal erythemal dose is used to calculate the duration of therapeutic exposure to ultraviolet light. For treatment using a “hot” ultraviolet lamp (UV-A or UV-B), the dose is calculated at a distance of 30 in. The minimal erythemal dose for “cold” ultraviolet (UV-C) is standardized at 30 to 38 sec at a distance of 1 in. Synonym: erythema dose; threshold dose See: table

CAUTION!

Burning, edema, and peeling occur at doses at or above the second degree erythemal dose.
DoseDescription
Suberythemal dose (SED)No erythema
Minimal erythemal dose (MED)Smallest dose that produces erythema within 1 to 6 hr and disappears within 24 hr
First degree erythemal dose (E1)Erythema lasts for 1 to 3 days. Some scaling of the skin is present. E1 is approximately 2.5 times the MED.
Second degree erythemal dose (E2)Erythema with associated edema, peeling, and pigmentation. E2 is approximately 5 times the MED.
Third degree erythemal dose (E3)Severe erythema and burning with associated blistering, peeling, and edema. E3 is approximately 10 times the MED.
See also: dose
References in periodicals archive ?
On the basis of calculated in vitro UPF values, and in line with the CIE erythemal action spectrum, the phenomenon of minimal erythema doses on the skin of test subjects was tested and the subsequent in vivo UPF values were calculated.
Caruana, & Holland Outcome measures: Location: United States Minimal erythema dose (MED), skin blood flow, Title: Synergistic Effects of and skin biopsy.
Traditional phototherapy is limited by its ability to deliver only a minimal erythema dose (MED) to avoid burning healthy skin at the margins of psoriasis.
The dose response curve of UV erythema was determined by reflectance spectrophotometry and the minimal erythema dose (MED) by visual grading before and after supplementation.

Full browser ?