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Diascopy is a test for blanchability performed by applying pressure with a ... (petechia or purpura). Hemorrhagic lesions and nonvascular lesions do not blanch ...
A petechia (/ p ɪ ˈ t iː k i ə /; [1] pl.: petechiae) is a small red or purple spot (≤4 mm in ... may also occur when excessive pressure is applied to tissue (e ...
Such lesions include petechia (less than 3 mm (0.12 in), resulting from numerous and diverse etiologies such as adverse reactions from medications such as warfarin, straining, asphyxiation, platelet disorders and diseases such as cytomegalovirus); [6] and purpura (3–10 mm (0.12–0.39 in)), classified as palpable purpura or non-palpable ...
Purpura (/ ˈ p ɜːr p jʊər ə / [1]) is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. [2]
The blanching skin test is used to determine if a rash or discoloration disappears when pressure is applied, which may be a sign of another illness.
The reddened skin blanches when pressure is applied to it. [5] The skin may feel itchy, but is not painful. [5] A more intense redness on the inside of skin folds and creases might be noticed. [4] These are lines of petechiae, appearing as pink/red areas located in arm pits and elbow pits. [18] It takes around a week for the main rash to ...
After removing the cuff, the number of petechiae in a 5 cm diameter circle of the area under pressure is counted. Normally less than 15 petechiae are seen. [2] 15 or more petechiae indicate capillary fragility, which occurs due to poor platelet function, bleeding diathesis or thrombocytopenia, and can be seen in cases of scurvy, [3] and Dengue ...
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