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Lithium

Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

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Lithium

The lithium test monitors blood levels of this mood stabilizer, as prescribed by your doctor. As part of a comprehensive health assessment, this test helps ensure your medication levels remain within the narrow therapeutic window for optimal safety and effectiveness.

What It Measures

This test measures the concentration of lithium in your blood, as prescribed by your doctor for mood disorders. Due to its narrow therapeutic window, precise monitoring is essential for both effectiveness and safety.

Why It Matters

Lithium has a very narrow therapeutic range, meaning the difference between an effective dose and a potentially harmful one is small. Regular monitoring helps your healthcare provider maintain optimal levels while minimizing the risk of toxicity.

When to Test

Testing is recommended when initiating lithium therapy, after dose adjustments, during illness or dehydration, or when kidney function changes. Your doctor will advise on the appropriate monitoring schedule for your situation.

Symptoms

Low Levels

Low lithium levels may indicate subtherapeutic dosing, which can be associated with inadequate mood stabilization and a return of bipolar symptoms. Consult your healthcare professional for interpretation of results.

High Levels

High lithium levels may indicate a risk of toxicity, which can be associated with tremor, nausea, vomiting, confusion, drowsiness, and in severe cases, kidney problems. Seek immediate medical attention if you experience these symptoms.

Lifestyle Tips

Take lithium exactly as prescribed by your doctor. Maintain consistent fluid intake and avoid sudden changes in salt consumption, as these can affect lithium levels. Attend all scheduled blood monitoring and kidney function appointments.

Frequently Asked Questions

Why does lithium require such frequent monitoring?

Lithium has a very narrow therapeutic window, meaning the effective dose is close to levels that may cause toxicity. Factors like hydration, kidney function, and other medications can shift levels, making regular monitoring essential for safety.

Can dehydration affect my lithium levels?

Yes, dehydration can cause lithium levels to rise, potentially increasing the risk of toxicity. It is important to maintain adequate fluid intake, especially during hot weather, exercise, or illness.

When should the blood sample be taken?

Lithium levels are typically measured 12 hours after the last dose (trough level). Your healthcare provider will give you specific instructions on the timing of your blood draw.