Lab test

TCA Drug Test - Tricyclic Antidepressants

This serum test screens for tricyclic antidepressants (TCAs), a class of medications used for depression and some other conditions.

Typical price

From $499

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

This serum test screens for tricyclic antidepressants (TCAs), a class of medications used for depression and some other conditions. It detects the presence of TCA compounds and can support therapeutic drug monitoring. Because TCAs have a potential for toxicity and misuse, measuring their level helps clinicians assess whether a person's exposure is in an expected range. Measuring the serum level allows a clinician to compare exposure against the range expected for the prescribed dose.

• Tricyclic antidepressants TCA compounds such as amitriptyline, nortriptyline, imipramine, and desipramine detected in serum.

• You take a tricyclic antidepressant and therapeutic monitoring is needed.
• A clinician is evaluating possible TCA toxicity or unexpected exposure.
• You are in a setting that screens for multiple drug classes.
• Symptoms such as drowsiness, confusion, or palpitations raise concern about TCA levels.

• No fasting is required unless your clinician adds other fasting tests to the order.
• Report the exact tricyclic medication and dose you take, and when you last took it.
• Mention all other medications, since interactions can affect TCA levels.
• Follow any instructions about timing the blood draw relative to your dose.

Results are usually interpreted alongside the timing of your last dose. A level within the expected range for your medication suggests exposure consistent with therapy, while a higher level may raise concern about toxicity and a lower level may suggest underdosing or non-adherence. Interpretation requires the specific drug and dose. Discuss all tricyclic antidepressant results with the prescribing healthcare provider before changing anything.

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