Test Details

Mnemonic

RF

Ordering Code

3007820

CPT-4 Code(s)

86431

Specimen Information

Collect

Serum separator tube (SST)

Specimen Preparation

Centrifuge, separate serum from cells and send 1.0 mL serum in a screw capped plastic vial.

Alternate Specimen

Plasma: Lavender EDTA, green lithium heparin
Serum: Red top

Minimum Volume

0.5 mL

Transport Temperature

Refrigerated

Rejection Criteria

Cerebrospinal fluid (CSF)

Stability

Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 3 months

Methodology

Nephelometry
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Reference Range

<15 IU/mL
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Performing Laboratory

Warde Medical Laboratory
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New York DOH Approval Status

Yes
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