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Mayo Clinic Laboratories

Test Code DILFR Free Dilantin (includes both Total Dilantin and Free Dilantin)

Specimen Volume

2.0 mL

Preferred Specimen

Red No Gel (RED)

Specimen Handling Instructions

Non-gel red tubes only.

Separate from cells ASAP or within 2 hours of collection.  Transfer 2 mL serum to an ARUP Standard Transport Tube.

Methodology

Quantitative Enzyme Multiplied Immunoassay Technique.

Routine Turn-around Time

1 - 4 days

Reference Ranges

Dilantin Total: 

Therapeutic:  10.0-20.0 µg/mL

Toxic:   >30 µg/mL

Dilantin Free:

Therapeutic : 1.0-2.5 µg/mL

Toxic: > 2.5 µg/mL