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What is a glass test?

Published in Medical Test 2 mins read

The "glass test" is a simple way to check for a rash associated with meningococcal septicaemia, a serious infection that can lead to meningitis. This test involves pressing a clear glass firmly against the rash. If the rash doesn't fade under pressure, it's a strong indicator of meningococcal septicaemia and requires immediate medical attention.

Here's how to perform the glass test:

  1. Press the glass: Take a clear glass, such as a drinking glass or a window pane, and press it firmly against the rash.
  2. Observe the rash: Look at the area where the glass was pressed. If the rash disappears under pressure, it may not be a meningococcal rash. However, if the rash remains visible, it could be a sign of meningococcal septicaemia and requires immediate medical attention.

Important Note: The glass test is not a definitive diagnosis. It should be used as a quick tool to help identify a potential symptom of meningococcal septicaemia. If you suspect someone might have meningococcal septicaemia, seek medical attention immediately.

Other signs of meningococcal septicaemia include:

  • Fever
  • Headache
  • Stiff neck
  • Nausea and vomiting
  • Confusion
  • Seizures

Additional information:

  • The glass test can also be used to check for other types of rashes, such as those caused by measles or chickenpox. However, it's not as reliable for these other rashes.
  • If you're concerned about someone's health, don't rely solely on the glass test. Always seek medical advice from a qualified healthcare professional.

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