91144 Metanephrines, Plasma (Free)

Specimen:

Collect:

Two 4 mL Lavender (EDTA)

Submit:

4 mL (Min:1.5 mL) Plasma. Submit Frozen. Submit in a Standard Transport Tube.

Special Handling:

Critical Frozen
Separate from cells ASAP
Discontinue epinephrine and epinephrine-like drugs at least one week before obtaining the specimen (only after consulting physician). The patient must refrain from using acetaminophen for 48 hours before the specimen is drawn. The patient must refrain from using caffeine, medications, and tobacco; and from drinking coffee, tea, or alcoholic beverages for at least four hours before the specimen is drawn. Collect the sample after the patient has had 15 minutes rest in a supine position.
Overnight fast prior to sample collection is recommended.

Rejection Criteria:

Grossly Hemolyzed Samples

Stability:

Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 Month(s); Incubated: Unacceptable

Methodology:

High performance liquid chromatography (HPLC)

Performed:

Monday, Tuesday, Wednesday, Thursday

Reported:

3-7 Day(s)

CPT Codes:

83835 - Metanephrines

Interpretive Data:

Please see report for interpretive data.

Components:

93533 - METANEPHRINE	93534 - NORMETANEPHRINE
93512 - INTERPRETATION