What is an acetaminophen level test?

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Dr Mahabub Shahin

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This test measures the amount of acetaminophen in the blood. Acetaminophen is one of the most common medicines used in over-the-counter pain relievers and fever reducers. It is found in more than 200 brand name medicines. These include Tylenol, Excedrin, Nyquil, and Paracetamol, which is commonly found outside the U. S. Acetaminophen is safe and effective when taken at the proper dose. But an overdose can cause serious and sometimes deadly liver damage.

Unfortunately, dosing mistakes are common. Reasons for this include:

  • Taking more than one medicine that contains acetaminophen. Many cold, flu, and allergy medicines contain acetaminophen. If you take more than one medicine with acetaminophen, you may end up taking an unsafe dose without realizing it
  • Not following dose recommendations. The adult maximum dose is generally 4000 mgs in 24 hours. But that may be too much for some people. So it may be safer to limit your dose to 3000 mgs per day. Children's dosing recommendations depend on their weight and age.
  • Giving a child an adult version of the medicine, rather than a version designed for children

    • If you think you or your child has taken too much acetaminophen, call your health care provider right away. You may need to be tested and treated in the emergency room.

    Other names: acetaminophen drug test, acetaminophen blood test, Paracetamol test, Tylenol drug test

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