Also known as: Lamotrigine Level (Lamictal), Lamictal Level, Lamotrigine Blood Test, Lamotrigine Serum Level, Lamictal Blood Test
CPT code: 80175the billing code Quest, Labcorp and hospital labs all use for this test
The short answer
Lamotrigine Level (Lamictal) measures Lamotrigine, Serum from a standard blood draw. At TestWell it costs $119.99 plus a $6 lab processing fee, needs no fasting, and results post in 3–5 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest.
TestWell Price
$119.99
+ $6 lab processing fee
A lamotrigine level measures the concentration of the anticonvulsant lamotrigine (brand name Lamictal) in your blood. It is a therapeutic drug monitoring test: the same dose produces very different blood levels in different people, and the level shifts with pregnancy, hormonal contraception, and other medications — valproate roughly doubles it, while carbamazepine, phenytoin, and oestrogen-containing pills lower it. Prescribers use the level to confirm a dose is in the usual therapeutic range (about 2.5–15 mcg/mL by the Quest method), to investigate breakthrough seizures or side effects such as dizziness, double vision, or unsteadiness, and to check adherence. The test is run by LC/MS/MS at Quest Diagnostics and reported in mcg/mL with the laboratory's reference range. Timing matters: a trough level, drawn shortly before your next dose once you have been on a steady dose for about a week, is the number your prescriber expects. Results are for you and your prescriber to review together — do not change your dose based on a level alone.
Therapeutic drug monitoring of lamotrigine: confirming a dose is in range after a change, during pregnancy or after starting or stopping an interacting drug (valproate, carbamazepine, phenytoin, oestrogen-containing contraception), investigating breakthrough seizures or dose-related side effects, and checking adherence.
People prescribed lamotrigine for epilepsy or bipolar disorder whose prescriber has asked for a level, who have changed dose or started an interacting medication, who are pregnant or planning pregnancy, or who want a baseline while stable.
Sample Type
Blood draw
Fasting
Not required
Results In
3–5 business days · typical; varies by lab and draw day
Performed At
Quest
1 biomarker tested
Your Lamotrigine Level (Lamictal) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 3–5 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you. Already have results? Analyze them with your AI assistant against our physician-reviewed ranges.
No fasting required. Draw a trough level: schedule your visit 30–60 minutes before your next lamotrigine dose, after at least 5–7 days on the same dose, and tell the lab when you took your last dose. Keep taking your medication as prescribed.
TestWell orders the same Lamotrigine Level (Lamictal) the labs run for doctors' offices, so you can walk into Quest Diagnostics with our requisition — no doctor's visit, a licensed physician authorizes the order, and most patient service centers take walk-ins. The table shows each lab's own test code, the name printed on the requisition, what the lab charges on its own consumer site, and the price through TestWell at that lab (plus one $6 fee per order).
| Lab | Test code | On the requisition | Lab's own site | Through TestWell |
|---|---|---|---|---|
| Quest Diagnostics | test code 22060 | “Lamotrigine Level (Lamictal)” | not sold direct | $119.99 + $6 |
You choose the lab at checkout; the requisition is written for that lab and arrives by email within minutes. New York and New Jersey orders draw at BioReference. Lab-direct prices are read from the labs' public pages and re-checked regularly.
Where to get it near you: patient service centers by state and city · search by ZIP code
A Lamotrigine Level (Lamictal) test costs $119.99 at TestWell — $125.99 all-in, since the $6 lab processing fee is charged once per order and there is no draw or physician fee. Hospital outpatient labs typically bill around $250.00 self-pay. With insurance you pay your plan's negotiated rate against your deductible; TestWell's price is fixed before the draw and HSA/FSA-eligible.
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest) | $119.99 | $125.99 | Includes the one $6 lab processing fee, charged once per order |
| Hospital outpatient lab, self-pay (typical) | $250.00 | $250.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 22060 · Labcorp test no. 716944. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
As a trough: 30–60 minutes before your next dose, once you have taken the same dose for at least 5–7 days so the level has reached steady state. A level drawn a few hours after a dose reads higher and is hard to compare with the usual range. Tell the lab when you took your last dose.
The reference range by the Quest LC/MS/MS method is about 2.5–15 mcg/mL. People do well across that range and some outside it; the right level is the one at which you are seizure-free or stable without side effects, which is why prescribers read it alongside how you are doing rather than as a pass/fail number.
Lamotrigine is cleared by glucuronidation, which other drugs and hormones speed up or slow down. Valproate roughly doubles the level; carbamazepine, phenytoin, rifampin, and oestrogen-containing contraception lower it; pregnancy can lower it substantially by the third trimester. Missed doses and timing of the draw also move it.
You do not need it. Every TestWell order includes a physician authorization from our clinical network, which is the order Quest requires. You can download your result as a PDF from your portal and send it to your prescriber. If your insurance covers the test, taking your doctor's own order directly to Quest may be cheaper than paying cash.
Lamotrigine Level (Lamictal) test results are typically ready in 3–5 business days after your draw at Quest. TestWell emails you the moment they post, and your results dashboard shows each marker against its reference range with a plain-English explanation.
No, fasting is not required for a Lamotrigine Level (Lamictal) test — you can eat normally and book any time of day. Draw a trough level: schedule your visit 30–60 minutes before your next lamotrigine dose, after at least 5–7 days on the same dose, and tell the lab when you took your last dose. Keep taking your medication as prescribed.
Order the Lamotrigine Level (Lamictal) test online from TestWell for $119.99 (plus a $6 per-order lab processing fee) — no doctor's visit, referral or insurance needed. A licensed physician authorizes the order, then you walk into any Quest patient service center near you for the draw (the lab locator on our site lists the closest ones by ZIP code), and results arrive in 3–5 business days.
CPT 80175. That is the billing code Quest, Labcorp and hospital laboratories all use for a Lamotrigine Level (Lamictal) test, so it is the number to match on an explanation of benefits, a doctor's order or a price list — the same code, the same test, whichever lab draws it. You do not need the code to order: TestWell sells the Lamotrigine Level (Lamictal) test for $119.99 with the physician order included, no insurance required, and results in 3–5 business days.
The Lamotrigine Level (Lamictal) test is Quest Diagnostics test code 22060, Labcorp test number 716944 (CPT 80175). TestWell orders it under those codes for $119.99 at Quest or Labcorp — no doctor's visit or insurance required, results in 3–5 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed October 2026
TestWell Price
$119.99
+ $6 lab processing fee at checkout
Get notified when this test becomes available
No insurance needed · HIPAA compliant
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