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
Fasting Specimen is Preferred
Separate aliquot required for each frozen test ordered
Separate from cells ASAP
Immediately place sample in wet ice bath.
Centrifuge within 30 minutes of collection, remove plasma and freeze.
Patient preparation: Discontinue epinephrine and epinephrine-like drugs at least one week prior to collection. Patient must refrain from taking acetaminophen for 48 hrs prior to collection. Patient must refrain from using caffeine, tobacco, medications, or alcoholic beverages 4 hours prior to collection.
Collect sample after patient has been resting in supine position for 15 minutes.
Overnight fasting 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:

Sun-Sat

Reported:

3-7 Day(s)

CPT Codes:

83835

Interpretive Data:

Please see report for interpretive data.

Components:

93533 - METANEPHRINE	93534 - NORMETANEPHRINE
93512 - INTERPRETATION