What Does A Serum Phenyltoin Level Of 2.9 Suggest?

Posted on Tue, 21 Apr 2015

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Tue, 21 Apr 2015 Answered on

Mon, 11 May 2015 Last reviewed on

Question : Serum Phenyltoin level report is 2.9,iits below normal value
Please suggest

Answered by Dr. Indu Kumar (23 minutes later)

Brief Answer:
You may need repeat test.

Detailed Answer:
Hello

You are getting maximum dose of phenytoin.
Patient generally have total phenytoin level 10.0-20.0 mcg/mL for therapeutic effects.
Normal level of free phenytoin level is 1.0-2.0 mcg/mL.

It is important to know 2.9 value is related to total or free phenytoin level.
If it is total level then it is low and you may need repeat test.

Get well soon.
Hope I have answered your question.
Further queries are most welcome.

Take Care
Dr.Indu XXXXXXX

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar