Solar Urticaria - Diagnosis


Solar urticaria can be difficult to diagnose, but its presence can be confirmed by the process of phototesting. There are several forms of these tests including photopatch tests, phototests, photoprovocation tests, and laboratory tests. All of these are necessary to determine the exact infliction that the patient is suffering from. Photopatch tests are patch tests conducted when it is believed that a patient is experiencing certain symptoms due to an allergy that will only occur when in contact with sunlight. After the procedure, the patient is given a low dosage of UVA radiation.

Another test known as a phototest is the most useful in identifying solar urticaria. In this test, one centimeter segments of skin are subject to varying amounts of UVA and UVB radiation in order to determine the specific dosage of the certain form of radiation that causes the urticaria to form. When testing for its less intense form (fixed solar urticaria), phototesting should be conducted only in the areas where the hives have appeared to avoid the possibility of getting false-negative results.

A third form of testing is the photoprovocation test which is used to identify disorders instigated by sun burns. The process of this test involves exposing one area of a patient's arm to certain dosage of UVB radiation and one area on the other arm to a certain dosage of UVA radiation. The amount of radiation that the patient is exposed to is equal to that "received in an hour of midday summer sun." If the procedure produces a rash, then the patient will undergo a biopsy. Finally, there are laboratory tests which generally involve procedures such as blood, urine, and fecal biochemical tests. In some situations, a skin biopsy may be performed.

Read more about this topic:  Solar Urticaria

Other articles related to "diagnosis":

Sexual Fetishism - Modern Theory and Treatment - Diagnosis
... It is sufficient for the diagnosis if one of the participants is being hurt or mistreated in any other way ... A correct diagnosis in terms of the ICD manual stipulates hierarchical proceeding ... Still today, arguments go on whether a specific diagnosis fetishism is needed at all or if paraphilia as such is sufficient ...
Taser - Excited Delirium
... Some of the deaths associated with tasers are given a diagnosis of excited delirium, a term for a phenomenon that manifests as a combination of delirium ... The diagnosis of excited delirium has been controversial ... medical examiners for several years, mainly as a diagnosis of exclusion established on autopsy ...
Rosenhan Experiment - Impact and Controversy
... criticizing the reliability of psychiatric diagnosis and the disempowering and demeaning nature of patient care experienced by the associates in the study ... Many defended psychiatry, arguing that as psychiatric diagnosis relies largely on the patient's report of their experiences, faking their presence no more demonstrates problems with psychiatric ...
Major Diagnostic Category
... by dividing all possible principal diagnoses (from ICD-9-CM) into 25 mutually exclusive diagnosis areas ... Significant Trauma) with at least two significant trauma diagnosis codes (either as principal or secondaries) from different body site categories ... Patients assigned to MDC 25 (HIV Infections) must have a principal diagnosis of an HIV Infection or a principal diagnosis of a significant HIV related condition and a secondary diagnosis of an HIV ...
Pheochromocytoma - Diagnosis
... The diagnosis can be established by measuring catecholamines and metanephrines in plasma (blood) or through a 24-hour urine collection ...