North Carolina EMT State Practice Exam

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Prepare for the North Carolina EMT State Exam with interactive quizzes and comprehensive explanations. Master your skills and gain confidence by reviewing key topics before test day!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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The oxygen concentration provided by a nasal cannula is generally between?

10% to 20%
20% to 30%
24% to 44%
45% to 60%

The correct answer is: 24% to 44%

A nasal cannula typically delivers oxygen at a concentration that ranges from 24% to 44%, depending on the flow rate of the oxygen being administered. This range occurs because the flow rate can influence how much room air mixes with the oxygen being supplied. For example, at lower flow rates (around 1 to 2 liters per minute), the oxygen concentration tends to be on the lower end of the scale, while at higher flow rates (up to about 6 liters per minute), the concentration approaches the upper limit of that range. Understanding this range is crucial for EMTs and healthcare providers, as it helps determine the appropriate method for supplemental oxygen based on a patient’s needs. Administering the correct concentration can significantly impact a patient's oxygenation status and overall clinical outcome.