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Romanowsky stain
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- 2. Collection of specimen Ideally,blood can be collected by finger prick ◦ If other tests being performed, can use venipuncture ◦ EDTA is preferred as the anticoagulant as heparin may lead to morphological distortion Smears should be prepared and stained within an hour of drawing the specimen. ◦ Alterations in morphology may occur if delayed.
- 4. THICK FILM THINFILM -lysed RBCs -fixed RBCs single layer -larger volume -smaller volume -o.25microlt blood/100 fields -0.005microlt blood/100 feilds -blood elements are more concentrated -good screening test -good species differentiation -difficult to diagnose species -used in mass surveys -requires more time to read -For quick diagnosis
- 5. Fixing of bloodfilm •The blood film need to be fixed with acetone free methyl alcohol for 1 minute. •Alcohol denature the protein and harden the cell contents. •For wright and leishman no pre fixation is required. •The stains most commonly used for staining of blood films are romanowsky stains.
- 6. To preserve themorphology of the cells, films must be fixed as soon as possible after they have dried. It is important to prevent contact with water before fixation is complete. Methyl alcohol (methanol) is the choice, although ethyl alcohol ("absolute alcohol") can be used Methylated spirit (95% ethanol) must not be used as it contains water. To fix the films, place them in a covered staining jar or tray containing the alcohol for 2-3 minutes. In humid climates it might be necessary to replace the methanol 2-3 times per day; the old portions can be used for storing clean slides.
- 7. Romanowsky stain •Romanowsky stain:it is named after dmitri leonovich romanowsky who invented it in 1891. • Definition: a stain made from water soluble eosin, methylene blue and acetone free methanol. •Romanowsky stains are universally employed for staining of blood films. All romanowsky combinations have two essential ingredients i.E. Methylene blue and eosin
- 8. Methylene blue •1)Cationic dye •2)Basic dye • 3) Blue-Purple colour •Structures that stain with methylene blue are termed as Basophilic.
- 9. 1) Anionic dye 2)Acid dye 3)Pink red-colour Structures that stain with eosin are termed Eosinophilic
- 10. Methylene blue combineswith anionic components of the cell .eg: DNA ,and stain these blue. Eosin combines with cationic components of the cell . eg: cytoplasm and stain them red . Then there occurs stain –stain interaction. This composition and mode of action allows romanowsky stains to reveal the subtle differences in shades of staining.
- 11. A well stained–smear with any of romanowsky stains shows following features : 1)Red blood cells: Pink red (or)Deep red colour. 2)Polychromatic cells(reticulocytes):Gray blue colour. 3) Neutrophils : Pale,Pink cytoplasm,Purple Granules . 4)Eosinophils: Pale,Pink cytoplasm, orange red granules 5) Basophils: Blue cytoplasm, Dark blue-Violet Granules . 6) Monocytes: Gray –Blue cytoplasm. 7)Lymphocytes: Dark blue cytoplasm. 8) Platelets: Purple Colour.
- 12. VARIOUS STAIN VARIOUS STAINSINCLUDED UNDER ROMANOWSKY STAINS ARE AS FOLLOWS: 1)Leishman stain 2)Giemsa stain 3)Wright stain 4)Field stain 5)Jenner stain 6)JSB stain Among the above mentioned stains ,Jenner is the simplest and Giemsa is the most complex. Leishman stain it occupies intermediate position and it is still widely used in the routine staining of blood films.
- 13. LEISHMAN STAIN: PRINCIPLE: Itis used in microscopy for staining blood smears. It provides excellent stain quality . COMPONENTS: It contains methylene blue and eosin in methanol(acetone free)in the ratio of 1.5gm/1 litre. It is generally used to differentiate and identify leucocytes, malaria parasites etc Preparation Dissolve 0.2 g of powdered Leishman’s dye in 100 ml of acetone-free methyl alcohol in a conical flask. Warm it to 50°C for half an hour with occasional shaking.
- 14. Procedure for staining 1)PourLeishman’s stain dropwise (counting the drops) on the slide and wait for 2 minutes. This allows fixation of the PBF in methyl alcohol. 2)Add double the quantity of buffered water dropwise over the slide (i.e. double the number of drops). 3) Mix for 8 minutes 4)Wash in water for 1 to 2 minutes. 5) Dry in air and examine under oil immersion lens of the microscope.
- 15. FIELD STAIN Materials: 1) Methanol(absolute) 2) Field’s stain A and B 3) Tube with water 4) Staining dishes 5)Filter paper
- 16. field stain A Methyleneblue 0.8gm Azure I 0.5 gm Disodium hydrogen phosphate 5 gm Potassium dihydrogen anhydrous 6.25gm Distilled water 500ml
- 17. Field stain B Eosin1gm Disodium hydrogen phosphate 5 gm Potassium dihydrogen phosphate 6.25 gm Distilled water 500ml
- 18. Procedure: A. Fix thinfilm with methanol for 1 min. B. Dry microscopic slide on filter paper C. Immerse slide in Field’s stain B (Eosin) for 5 seconds D. Immediately wash with water E. Immerse slide in Field‘s stain A (Methylene blue) for 10 seconds