Preferred Sample Type

Lamotrigine (Lamictal)

Suitable Specimen Types

  • Serum
  • EDTA Plasma
  • Li Hep Plasma
100 ul serum/plasma

Sample Processing in Laboratory

Centrifuge and place in toxicology box in cold room.

Sample Preparation


Turnaround Time

5 working days

Sample Stability

4 ÂșC

Lamotrigine (Lamictal)

General Information

Lamotrigine is indicated for the treatment of partial and generalised seizures in adults and increasingly, in children. It may also have a role in the treatment of conditions such as Parkinson's disease. Adverse reactions are relativel minor, for example: (nausea, headache and dizziness). A typical dosage for Lamotrigine is 200-400 mg. bd; a therapeutic range of 1.0-4.0mg/L has been proposed by Wellcome. The half-life of the drug is around 24hours; although this is affected by concomitant therapy. Lamotrigine is known to delay the metabolism of carbamzepine and may also interact with other drugs. There is no therapeutic range for Lamotrigine and the tentative therapeutic range of 1-4 mg/L is suggested but this may be of limited value.

Patient Preparation

Trough specimen taken pre-dose or minimum 6hrs post-dose

Reference Range

Therapeutic range (epilepsy): 1 - 4 mg/L

Maximum drug efficacy (bipolar disorder): 3 - 14 mg/L



  • EQA Scheme?: Yes
  • EQA Status: NEQAS TDM

The laboratories at Heartlands Hospital, Good Hope Hospital and Solihull Hospital form part of the services provided by University Hospitals Birmingham and are UKAS (United Kingdom Accreditation Service) accredited to the ISO 15189:2012 standard. For a list of accredited tests and other information please visit the UKAS website using the following link:

  • Heartlands, Good Hope and Solihull Hospital pathology laboratories are a UKAS accredited medical laboratory No.8217
  • United Kingdom Health Security Agency laboratory is a UKAS accredited medical laboratory No.8213

Tests not appearing on the UKAS Schedule of Accreditation currently remain outside of our scope of accreditation. However, these tests have been validated to the same high standard as accredited tests and are performed by the same trained and competent staff.

For further test information, please visit the test database:

Protection of personal information - Laboratory Medicine comply with the Trust Data Protection policy and have procedures in place to allow the Directorate and its employees to comply with the Data Protection act  1998 and associated best practice and guidance.

For further information contact Louise Fallon, Quality Manager, 0121 424 1235