# A client reports one acute ingestion of acetaminophen 6 hours ago. The time is considered reliable, and the serum acetaminophen concentration drawn now plots on the treatment line. Complete the clinical judgment statement. > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=396135&lang=en > language: en > subject: Adverse Effects/Contraindications/Interactions > category: PPT ## Question A client reports one acute ingestion of acetaminophen 6 hours ago. The time is considered reliable, and the serum acetaminophen concentration drawn now plots on the treatment line. Complete the clinical judgment statement. Because the sample was obtained ::선택::4 to 24 hours after the single acute ingestionbefore 4 hours after the ingestionafter repeated doses over several daysat an unknown time that cannot be clarified, the nurse should interpret it with the ::선택::revised Rumack-Matthew nomogramGlasgow Coma ScaleWells scoreBraden Scale and anticipate ::선택::prompt acetylcysteine treatment and toxicology consultationdischarge because the aminotransferase is initially normalnaloxone as the acetaminophen antidoterepeat evaluation in one week without treatment. ## Explanation For a single acute acetaminophen ingestion with a reliable time, a concentration drawn 4 to 24 hours after ingestion is interpreted using the revised Rumack-Matthew nomogram. A concentration on or above the treatment line indicates acetylcysteine. Treatment is not withheld because early symptoms are mild or initial aminotransferases are normal. The nomogram is not used in the same way for an unknown or unreliable time or for repeated supratherapeutic ingestion; those patterns require a different toxicology pathway and poison-center or clinical-toxicologist consultation. ## In-depth explanation Correct Answer The 6-hour concentration is within the 4-to-24-hour window for a reliable single acute ingestion. Plot it on the revised Rumack-Matthew nomogram and start acetylcysteine because it is on the treatment line. Why It Fits The decision combines ingestion pattern, reliable timing, measured concentration, and the treatment threshold. Early clinical appearance and an initially normal aminotransferase do not override a toxic concentration. Clinical Picture The client is early enough that hepatic injury may not yet be reflected in laboratory values. Timely antidotal therapy prevents progression while the team monitors acetaminophen concentration, liver tests, coagulation when indicated, and clinical status. Memory Link Known single time + level at 4 to 24 hours = nomogram decision. NCLEX Rule Do not wait for jaundice or liver failure when a time-dependent antidote decision is already supported. Also do not apply the nomogram to repeated ingestion or an unreliable time as though the pattern were acute and known. Why the Alternatives Fail A level drawn before 4 hours cannot be used to risk-stratify on the nomogram. Observation alone or delayed follow-up ignores the treatment threshold, while naloxone does not reverse acetaminophen hepatotoxicity. Source 12023 US-Canada Acetaminophen Poisoning Consensus Statement 2PubMed Record: Dart et al. ## Clinical scenario The nurse confirms the formulation, amount, start time, duration, intent, co-ingestants, body weight, symptoms, and relevant history. The client has nausea, but the initial aminotransferase level is not elevated. ## Key concepts - **Single Acute Acetaminophen Ingestion** — An acetaminophen exposure taken over a short, known interval. A reliable ingestion time permits a concentration drawn 4 to 24 hours later to be interpreted on the treatment nomogram. - **Rumack-Matthew Nomogram** — A time-concentration tool for risk assessment after a single acute ingestion with a reliable time. It is not applied in the same way to repeated ingestion or an unknown or unreliable time. - **Acetylcysteine** — The antidote that limits acetaminophen-related liver injury. It is started when the timed concentration meets the treatment threshold or when another toxicology pathway indicates treatment. ## Related questions - [A client is admitted to the emergency department after ingesting an unknown amount of acet…](https://mymerci.kr/pages/nclex_q.php?qn_id=362720&lang=en) - [A client with chronic heart failure is prescribed metoprolol 25 mg orally twice daily. 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