# A 24-year-old client weighing 60 kg presents 6.5 hours after a single, known-time ingestion of immediate-release acetaminophen. Highlight the findings that establish the need for immediate antidotal treatment or show that the current acetylcysteine order must be corrected before administration.

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> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A 24-year-old client weighing 60 kg presents 6.5 hours after a single, known-time ingestion of immediate-release acetaminophen. Highlight the findings that establish the need for immediate antidotal treatment or show that the current acetylcysteine order must be corrected before administration.

Emergency Record
A 24-year-old client weighing 60 kg reports one ingestion of 30 immediate-release acetaminophen 500-mg tablets at 0100. The calculated exposure is 15 g or 250 mg/kg. Arrival is at 0730, and the timed 4-hour acetaminophen concentration was 185 mcg/mL. The client reports nausea and mild right-upper-quadrant discomfort. AST is 24 U/L, ALT is 21 U/L, INR is 1.0, and creatinine is 0.8 mg/dL. The current order is acetylcysteine 6,000 mg IV as the loading dose.

## Explanation

The calculated 250 mg/kg ingestion and 4-hour acetaminophen concentration of 185 mcg/mL require prompt treatment; the ordered 6,000-mg IV loading dose is below the labeled 150 mg/kg dose of 9,000 mg for this 60-kg client.

## In-depth explanation

Quick answer
Start antidotal treatment promptly and correct the loading dose: 250 mg/kg, 185 mcg/mL at 4 hours, and a 6,000-mg loading order are the decisive findings.

Why this is correct
A single acute ingestion above the treatment threshold should not wait for aminotransferases to rise. The labeled IV loading dose is 150 mg/kg, which equals 9,000 mg for 60 kg; 6,000 mg is only 100 mg/kg.

Easy analogy or mental picture
The nomogram is the smoke alarm and the weight-based dose is the extinguisher size. A normal baseline liver panel does not silence the alarm or make an undersized extinguisher adequate.

Memory hook
Known-time toxic level: treat now; 150 mg/kg times 60 kg equals 9,000 mg.

NCLEX decision rule
For a known-time acute ingestion, connect the timed concentration to the treatment line, then independently verify every weight-based antidote dose before it reaches the client.

Why the other choices are wrong
Normal AST, ALT, INR, and creatinine are useful baselines but do not exclude evolving toxicity. Nausea alone is nonspecific and is not the dosing calculation.References
1FDA: ACETADOTE Prescribing InformationIV acetylcysteine indication, 150 mg/kg loading dose, and monitoring
2US and Canada Acetaminophen Poisoning Consensus StatementHistory, nomogram, antidote timing, laboratory monitoring, and toxicology consultation

## Clinical scenario

Acetaminophen antidote decision
Separate the timed toxic exposure and weight-based antidote error from normal early laboratory values that can create false reassurance.

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