In whole mouth testing, small quantities (2-10 mL) of solution are administered, and the patient is asked to swish the solution around in the mouth.Threshold tests for sucrose (sweet), citric acid (sour), sodium chloride (salty), and quinine or caffeine (bitter) are frequently performed with natural stimuli. One of the most frequently used techniques is the "three-drop test." In this test, three drops of liquid are presented to the subject. One of the drops is of the taste stimulus, and the other two drops are pure water. Threshold is defined as the concentration at which the patient identifies the taste correctly three times in a row.Suprathreshold tests, which provide intensities of taste stimuli above threshold levels, are used to assess the patients ability to differentiate between different intensities of taste and to estimate the magnitude of suprathreshold loss of taste. From these tests, ratings of pleasantness can be obtained using either the direct scaling or magnitude matching method and may be of value in the diagnosis of dysgeusia. Direct scaling tests show the ability to discriminate among different intensities of stimuli and whether a stimulus of one quality (sweet) is stronger or weaker than a stimulus of another quality (sour). Direct scaling cannot be used to determine if a taste stimulus is being perceived at abnormal levels. In this case, magnitude matching is used, in which a patient is asked to rate the intensities of taste stimuli and stimuli of another sensory system, such as the loudness of a tone, on a similar scale.
Small plaque parapsoriasis  characteristically occurs with skin lesions that are round, oval, discrete patches or thin plaques, mainly on the trunk. : 452 : 207 Subtypes:

Xanthoerythrodermia perstans is a distinct variant with lesions that are yellow in color. : 452 
Digitate dermatosis is a distinct variant with lesions in the shape of a finger and distributed symmetrically on the flanks. : 452

See also
Parapsoriasis
List of cutaneous conditions

References


== External links ==