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Biochemistry Home collection available

Phenytoin, Serum

Parameters1 tested
SampleBlood
FastingNot required
Report in24-48 hrs

How to prepare

No fasting needed

You can eat and drink normally before the test.

Good to know

No special preparation needed.

Medicines

Tell our phlebotomist about any medicines you take. Don't stop them without asking your doctor.

Comfortable clothes

Wear a loose sleeve so the sample can be taken easily from your arm.

How it works

Book onlinePick a time slot
Home visitSealed, sterile kit
Lab testingBarcode tracked
ReportIn 24-48 hrs

About this test

Phenytoin is a medicine for fits. Its blood level must stay within a narrow range, so it is checked regularly.

Why is this test done?

  • Keep the dose effective and safe
  • Check for toxicity
  • Check when fits are not controlled

Symptoms — when should you get tested?

  • Fits continuing
  • Unsteady walking or slurred speech
  • Jerky eye movements
  • Drowsiness

Normal range

Therapeutic 10 – 20 µg/mL

Reference ranges differ slightly between labs, methods, age and sex. Always discuss your report with your doctor.

If your result is high

High levels cause dizziness, unsteadiness and drowsiness.

Common reasons
  • Dose too high
  • Interaction with other medicines
  • Liver disease

If your result is low

Low levels may not control fits.

Common reasons
  • Missed doses
  • Dose too low
  • Other medicines lowering the level

How is the test done?

  1. 1
    Book online

    Choose your slot for home collection or a visit to our centre.

  2. 2
    Blood sample taken

    A trained phlebotomist takes a small blood sample from a vein in your arm with a sealed, single-use needle. It takes about 2 minutes.

  3. 3
    Tested in our lab

    Your barcoded sample is tested on automated machines with strict quality checks.

  4. 4
    Report on WhatsApp

    A pathologist checks the result and the report reaches you on WhatsApp and email.

Frequently asked questions

No fasting is needed for this test. You can eat and drink normally.

Your report is usually ready in 24-48 hrs after the sample reaches our lab. We send it on WhatsApp and email, and you can also download it from the Reports page.

Please call our team to confirm whether home sample collection is available for your location and test.

This test needs a blood sample. No special preparation needed.

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