ASCP Medical Laboratory Technician (MLT) Practice Exam 2025 - Free MLT Exam Questions and Study Guide

The correct answer identifies the toxic level of lithium as being in the range of 1.5-2 mmol/L. This range is significant because lithium is a medication commonly used to treat bipolar disorder, and its therapeutic window is quite narrow. Levels below the threshold of 1.5 mmol/L are typically considered therapeutic; however, once levels reach 1.5 mmol/L, the risk of toxicity begins to increase.

At 1.5 mmol/L and above, patients may begin to experience symptoms of toxicity, including gastrointestinal distress, tremors, confusion, and even more severe neurological symptoms. Therefore, monitoring lithium levels is crucial for managing patients effectively to ensure that they remain within a safe and effective therapeutic range.

Understanding these levels is vital for healthcare providers and laboratory technicians alike, as it plays a key role in patient care and management of medication regimens.