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The diastase negative slide will show a magenta staining where glycogen is present within a section of tissue. The slide that has been treated with diastase will lack any positive PAS staining in those locations on the slide PAS staining is also used for staining cellulose. One example would be looking for implanted medical devices composed of ...
PAS diastase stain is also used to identify alpha-1 antitrypsin globules in hepatocytes, which is a characteristic finding of alpha-1 antitrypsin deficiency. [2] PAS diastase stain is also used in diagnosing Whipple’s disease , as the foamy macrophages that infiltrate the lamina propria of the small intestine in this disease possess PAS ...
Unlike negative staining, positive staining uses basic dyes to color the specimen against a bright background. While chromophore is used for both negative and positive staining alike, the type of chromophore used in this technique is a positively charged ion instead of a negative one. The negatively charged cell wall of many microorganisms ...
H&E stain. Products of conception, abbreviated POC, is a medical term used for the tissue derived from the union of an egg and a sperm. It encompasses anembryonic gestation (blighted ovum) which does not have a viable embryo. In the context of tissue from a dilation and curettage, the presence of POC essentially excludes an ectopic pregnancy.
The test is based on differences between maternal and fetal hemoglobin.Maternal blood contains adult hemoglobin composed of two alpha and two beta subunits (aka hemoglobin A or HbA; i.e., normal adult hemoglobin).
Micrograph showing casts in a kidney biopsy using PAS stain: Hyaline casts are PAS-positive (dark pink/red, right of image). Myelomatous casts are PAS-negative (pale pink, left of image) Urinary casts are microscopic cylindrical structures produced by the kidney and present in the urine in certain disease states.
After separation of red cell membranes by SDS-polyacrylamide gel electrophoresis and staining with periodic acid-Schiff staining (PAS) four glycophorins have been identified. These have been named glycophorin A, B, C and D in order of the quantity present in the membrane – glycophorin A being the most and glycophorin D the least common.
Positive fern test with amniotic fluid as seen under the microscope. The fern test is a medical laboratory test used in obstetrics and gynecology.The name refers to the detection of a characteristic "fern like" pattern of vaginal secretions when a specimen is allowed to dry on a glass slide and is viewed under a low-power microscope.