METAFF

Metanephrines, Plasma

EPIC Test Procedure Code: LAB3442

Synonyms:
Free Metanephrines
Performing Lab:
Referral Laboratory
Patient Preparation:

The patient should be fasting overnight (water and non-caffeinated soft drinks are permissible).

Container Type:
Lavender top (EDTA) tube (chilled)
Specimen Type:

Plasma

Preferred Volume:
1.2mL
Minimum Volume:
0.7 mL (Note: This volume does not allow for repeat testing.)
Collection Procedure:

1. The patient should be in a fully recumbent position (lying down) for at least 20 minutes before and during the sample collection.
2. Draw blood in a chilled EDTA tube. Invert and mix with preservatives.
3. Centrifuge and transfer the plasma to a labeled plastic transport tube.
4. Refrigerate or freeze separated plasma immediately.

Store and Transport:
Refrigerated (freeze if specimen can't be kept refrigerated)
Stability:

Stability after plasma is separated and removed from the cells:
Frozen - 14 days
Refrigerated - 14 days
Room temperature - unstable

Unacceptable Condition:

Heparinized plasma specimens will be rejected.

CPT Codes:

83835 - Metanephrines Frac Free (EAP 30021144)

Method:
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Reference Ranges:

Please refer to the performing lab report for applicable reference ranges
Notes:

Concentrations of normetanephrine between 146 and 487 pg/mL and metanephrine between 63 and 255 pg/mL are considered indeterminate.

Lab Personnel

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