A client with trigeminal neuralgia reports frequent use of acetaminophen (Tylenol). What lab result would indicate potential toxicity?

When considering potential toxicity from acetaminophen, it's crucial to look at liver function tests and specific indicators of liver damage. Acetaminophen overdose is known to lead to hepatotoxicity, which can manifest in elevated levels of liver enzymes and alterations in bilirubin levels.

A direct bilirubin level indicates the liver's ability to conjugate and excrete bilirubin. In the case of acetaminophen toxicity, the liver's function may be impaired, leading to an accumulation of bilirubin. A direct bilirubin level of 2 mg/dL suggests that there could be a liver dysfunction or damage, as normal direct bilirubin levels are typically less than 0.3 mg/dL.

Thus, an elevated direct bilirubin level serves as a crucial lab result indicating that the client might be experiencing toxicity from acetaminophen, highlighting the importance of monitoring liver function in patients who frequently use this medication.