Diagnostic Tests

Klb Smear Throat Swab


Klb Smear Throat Swab

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What is this test?

Albert's staining technique is a type of special staining technique since it is used to demonstrate a special structure in bacteria. It is chiefly used to demonstrate metachromatic granules found in Corynebacterium diphtheriae. This bacterium is responsible for the disease diphtheria. The name Corynebacterium is derived from the Greek word "Coryne", which refers to the club shape of the bacteria seen in old cultures. The storage granules in this bacterium is called metachromatic granules because it exhibits the property of metachromasia, wherein the granules appear in a colour other than the colour used for staining. When stained with polychrome methylene blue, the granules appear violet while the rest of the bacillus appears blue. The granules are made up of polymetaphosphates and are known by various other names such as volutin bodies, Babe-Ernst granules or polar bodies. The bacterium produces the granules in abundance when grown on nutrient rich medium such as Loeffler's serum slope. When stained with Albert's stain, the bacillus stains green whereas the granules stain bluish black. There are two reagents that are used in the staining process: Albert's A solution and Albert's B solution. Albert's A solution consists of Toluidine blue, malachite green, glacial acetic acid, and ethyl alcohol. Albert's B solution contains Iodine and Potassium iodide in water.

Test Preparation

No special preparation is needed for Klb Smear Throat Swab. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing Klb Smear Throat Swab. Your doctor depending on your condition will give specific instructions.

Understanding your test results

GenderAge groupsValue
UNISEXAll age groupsMetachromatic granules seen on the smear
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