Paracetamol (Acetaminophen)

The Paracetamol (Acetaminophen), Serum test measures the concentration of paracetamol in the bloodstream. Paracetamol is a commonly used medication for relieving pain and reducing fever, but taking excessive amounts can cause serious liver damage and, in severe cases, liver failure. This test helps determine whether paracetamol levels are within a safe range and plays a critical role in the assessment and management of suspected overdose. Timely measurement of serum paracetamol levels enables healthcare providers to evaluate toxicity risk and initiate appropriate treatment when necessary.

Who Should Get This Test Done?

This test may be recommended if individuals:

●     Are suspected of having taken an excessive dose of paracetamol (acetaminophen), either accidentally or intentionally.

●     Present to the emergency department following a known or suspected paracetamol overdose.

●     Experience symptoms such as nausea, vomiting, abdominal pain, excessive sweating, confusion, or other signs of possible paracetamol toxicity.

●     Have unexplained liver injury or abnormal liver function tests where medication-related toxicity is suspected.

●     Require monitoring during treatment for paracetamol poisoning or have a history of repeated high-dose paracetamol use.

Why Consider This Test?

Paracetamol overdose is one of the most common causes of drug-induced liver injury. Measuring serum paracetamol levels helps determine the risk of toxicity and guides decisions regarding antidote treatment, such as N-acetylcysteine (NAC). Early detection of potentially toxic levels can significantly reduce the risk of liver damage and improve clinical outcomes. The test also helps healthcare providers assess the severity of exposure and monitor response to treatment.

More Information About the Test

This test requires a blood sample and is most informative when performed at the appropriate time after paracetamol ingestion, typically at least four hours following a single acute overdose. Results are reported as the concentration of paracetamol in the blood and are often interpreted using established clinical guidelines to assess toxicity risk. In cases of suspected poisoning, additional tests such as liver function tests, coagulation studies, and kidney function tests may also be recommended. Results should always be interpreted in conjunction with the patient’s clinical condition, medical history, and the timing of medication intake.

Other Names

• Acetaminophen Level, Serum

• Paracetamol Level Test

• Serum Acetaminophen Assay

• Acetaminophen Toxicity Test

• Paracetamol Drug Level

• Serum Paracetamol Concentration