Free Dilantin
The Free Dilantin test measures the level of phenytoin in the blood, specifically the unbound fraction that is active in the body. Clinicians typically order this test to monitor therapeutic levels in patients undergoing treatment for seizures, as phenytoin is commonly prescribed for epilepsy. It is particularly useful in clinical situations where dosage adjustments are necessary or when a patient experiences side effects. The Free Dilantin test helps ensure that medication levels remain within a therapeutic range, providing effective seizure control without toxicity.
Test Essentials
Specimen Required
7 mL blood (red top)
Test Category
Chemistry
Turnaround Time
Results for the Free Dilantin test are typically available within 24–48 hours after sample collection.
Clinical Information
Clinical Significance
Abnormal results from the Free Dilantin test may indicate either low or high levels of phenytoin in the blood. Low levels could suggest inadequate seizure control, while high levels may lead to potential toxicity and side effects. The diagnostic value of the Free Dilantin test lies in its ability to guide therapy adjustments. It is essential to consult your healthcare provider for interpretation of results in the context of your specific health situation.
Reference Ranges
Reference ranges for the Free Dilantin test can vary based on the laboratory and individual patient factors, including age and sex. Generally, the interpretation of results involves comparing your levels to established reference ranges. It is essential to remember that these ranges are guidelines and may differ based on specific lab techniques.
Sample Preparation
Before your Free Dilantin test, it's important to follow any instructions provided by your healthcare provider. Generally, no fasting is required. However, inform your doctor about any medications or supplements you are taking, as some may need to be adjusted before the test. It is crucial to take the test at the same time relative to your last dose of phenytoin for accurate results.
Related Tests
Code: 0212
Code: 0230
Code: P0204
Frequently Asked Questions
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