Gram positive vs gram negative shape6/30/2023 Classic Spotlight: How the Gram Stain Works. Department of Health and Human Services Blood Tests. National Heart, Lung, and Blood Institute.Science Education Resource Center Gram Staining. Washington D.C.: American Association for Clinical Chemistry c2001–2020. Learn more about laboratory tests, reference ranges, and understanding results. If you have questions about your results, talk to your health care provider. But you may need more tests to find out which specific fungal infection you have. The results may show what category of fungal infection you have: yeast or mold. Gram stain results may also show whether you have a fungal infection. You may need more tests, such as a bacteria culture, to confirm what type of bacteria it is. The shape can provide more information about the type of infection you have.Īlthough your results may not identify the exact type of bacteria in your sample, they can help your provider get closer to finding out what's causing your illness and how best to treat it. Most bacteria are either round (known as cocci) or rod-shaped (known as bacilli). Your results will also include information about the shape of the bacteria in your sample. If the bacteria was colored pink or red, it means you likely have a Gram-negative infection.If the bacteria was colored purple, it means you likely have a Gram-positive infection.If bacteria were found, it will have certain qualities may provide important information about your infection: If no bacteria were found, it means you probably don't have a bacterial infection or there weren't enough bacteria in the sample. A laboratory professional will examine the slide under a microscope. Your sample will be placed on a slide and treated with the Gram stain. Knowing whether bacteria is Gram-positive or Gram-negative can help your provider identify the type of infection you have and which antibiotics will be most effective in treating it. Gram-negative infections include salmonella, pneumonia, urinary tract infections, and gonorrhea.Gram-positive infections include methicillin-resistant Staphylococcus aureus ( MRSA), strep infections, and toxic shock.The two categories cause different types of infections: If the bacteria turns pink or red, they are Gram-negative. If the bacteria stays purple, they are Gram-positive. When the stain combines with bacteria in a sample, the bacteria will either stay purple or turn pink or red. The categories are diagnosed based on the how the bacteria reacts to the Gram stain. There are two main categories of bacterial infections: Gram-positive and Gram-negative. Gram stains may also be used to check for bacteria in certain body fluids, such as blood or urine. A Gram stain is a test that checks for bacteria at the site of a suspected infection such as the throat, lungs, genitals, or in skin wounds.
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