touch preparation


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touch preparation

1. The dabbing of a clinical specimen, e.g., the cut surface of an organ or tissue, onto a microscope slide to distribute a thin layer of cells for microscopic examination.
2. Any slide so obtained and prepared for pathological analysis.
See also: preparation
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b, Touch preparation readily distinguishes this as a meningioma with the tight whorls and clusters of cells.
Discordant Cases: Intraoperative Touch Preparation Versus Final Diagnosis of Sentinel Lymph Nodes (SLN) on Hematoxylin-Eosin Permanent Section Intraoperative Final Size of SLN Count SLN Count Metastasis (No.
Giemsa-stained touch preparations demonstrate cytoplasmic granules.
Because repreparing the sample with direct touch preparations may not be possible, at least two grids should be obtained when the specimen is collected.
One may chose to do core biopsies first, since cytologic preparations may be prepared by touch, crush, or scrape preparations of core biopsy tissue, thus saving the expense of an aspiration needle (Figs 2 and 3) Touch preparations have previously been shown to adequately evaluate needle placement.
Since examination facilities or wards usually do not have the material to do direct touch preparations onto EM grids, many health officials advocate placing samples into transport medium.
Touch preparations are recommended for pituitary adenomas, oligodendrogliomas, and lymphomas.