Pathology tests database

Sample and container requirements

Serum Lithium Heparin Plasma (paediatrics only)

Minimum volume required

Special requirements

None

Patient preparation

Samples should be taken at trough drug levels by collecting a sample prior to the next dose.

Sample viability

Turnaround time

2 days

Reference range

5 – 20 mg/L (Source: Pathology Harmony Recommendations)

Clinical guidance

Phenytoin is used to treat several seizure disorders (except absence seizures). It is also used as short-term prophylaxis after brain injury. Please refer to LabTestsOnlineUK to learn more about phenytoin. https://labtestsonline.org.uk/tests/phenytoin

Notes