What is the phenytoin (dilantin) lab test?
A phenytoin (dilantin) lab test is a blood test that measures the level of phenytoin in the blood.
Why is the phenytoin (dilantin) lab test done?
A phenytoin (dilantin) lab test is done in order to:
- Monitor the level of phenytoin in the blood,
- Establish a therapeutic dose of phenytoin,
- Detect potential for toxicity.
What does the phenytoin (dilantin) lab test measure?
A phenytoin (dilantin) lab test measures the concentration of phenytoin in the blood. Phenytoin is an antiepileptic (seizure controlling) medicine. It is important to keep phenytoin within its therapeutic range in order to avoid toxicity or increased number of seizures (temporary abnormality in muscle tone and movement).
Are there any risks associated with this test?
there are no known risks associated with this test.
How should I prepare for this test?
This test does not require any special preparation.
When should phenytoin levels be checked?
In case of intravenous phenytoin, the level can be checked one hour after the dose has been taken. In case of oral phenytoin, the level can be checked 24 hours after the last dose.
What happens if you take too much phenytoin?
Overdose symptoms may include twitching eye movements, slurred speech, loss of balance, tremor, muscle stiffness or weakness, nausea, vomiting, feeling light-headed, fainting, and slow or shallow breathing.
What should I do if I forgot to skip my dose just before my test?
It is recommended to avoid getting this test done on that day because taking phenytoin just before the test will significantly influence the result of the test.
The therapeutic range of phenytoin for adults is between 10-20 mcg/mL.
A phenytoin (dilantin) lab test is done in order to:
- Monitor the level of phenytoin in the blood,
- Establish a therapeutic dose of phenytoin,
- Detect potential for toxicity.