Patient ingestion information is not always reliable, and a more accurate method to estimate toxicity is to determine drug half-life.Acetaminophen half-life is normally 2 to 3 hours, and hepatic damage is likely if drug levels are greater than 300 ug/mL at 4 hours after ingestion or 50 ug/mL after 12 hours.To determine acetaminophen half-life, the first of two samples should be drawn at least 4 hours after poisoning to ensure peak levels have been achieved.
Stability
Refrigerated: on the cells -5 days, off the cells - 14 days.
