Specimen

Serum

Collection Medium:

Alternate
Collection Media:

Green top tube (Na Heparin), Lavender top tube (EDTA)

Minimum:

Adult Preferred minimium:  2.5 mL serum, heparinized or EDTA plasma
Absolute Adult & Pediatric minimum: 1.5 mL serum, heparinized
  or EDTA plasma

Rejection Criteria:

Gel separator tubes

Delivery Instructions:

Deliver to laboratory within 1 hour of collection.

Analytic Time:

5 working days

Reference Range:

Therapeutic range:  50 - 100 ng/mL

Comments:

The therapeutic range is not well established. Patient response appears 
to improve with concentrations between 50 and 100 ng/mL. Levels below 
25 ng/mL may have no effect. Poor response and increased toxicity have 
been reported at concentrations above 100 ng/mL.

Methodology:

High Performance Liquid Chromatography

CPT Code:

82486