WHAT IS GRAM STAIN TEST?

WHAT IS GRAM STAIN TEST?

Gram staining divides bacteria into two groups according to their staining properties: gramnegative and grampositive. The staining involves placing drops of crystal violet dye onto the specimen sample, washing off the violet stain, and flooding the smear with an iodine solution followed by a 95% ethyl alcohol (ethanol) solution. Gram-positive cells remain blue, and gram-negative cells are decolourised by the alcohol. The specimen is then stained with a red dye called “safranin O,” which colours the gram-positive cells red and leaves the gram-negative cells appearing purple. The cell wall structure is the basis of the Gram reaction. Gram staining of specimens aids in decision-making for early, broad-spectrum antibiotic therapy. Gram stain is 67.9% sensitive for the detection of bacteria in blood cultures. 

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About Genomic Medicine UK

Genomic Medicine UK is the home of comprehensive genomic testing in London. Our consultant medical doctors work tirelessly to provide the highest standards of medical laboratory testing for personalised medical treatments, genomic risk assessments for common diseases and genomic risk assessment for cancers at an affordable cost for everybody. We use state-of-the-art modern technologies of next-generation sequencing and DNA chip microarray to provide all of our patients and partner doctors with a reliable, evidence-based, thorough and valuable medical service.

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