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Lab Dept:
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Chemistry
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Test Name:
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FOLATE, ERYTHROCYTES
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General Information
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Lab Order Codes:
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FOLE
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Synonyms:
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Folate, RBC; Folate, Red Blood Cells; RBC Folate; Red Cell Folate
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CPT Codes:
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82747 – Folic acid, RBC
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Test Includes:
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Folate, erythrocytes reported in ng/mL.
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Logistics
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Test Indications:
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Useful for the identification of folate deficiency following a balanced meal (erythrocyte folate concentration rises more slowly than serum folate) and for evaluation of individuals with low serum concentration of both folate and iron.
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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Mayo Medical Laboratories (MML Test# FFRBC) Forward to ARUP, Salt Lake City, UT.
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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3 – 5 days, test performed daily
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Special Instructions:
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See Collection. A Hematocrit must be ordered within 24 hours prior to or with the collection of an RBC Folate specimen. If one has not been done, one will be ordered and performed. The RBC Folate test requires a current hematocrit value.
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Lavender top (EDTA) tube
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Draw Volume:
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3 mL (Minimum: 1 mL) blood
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Processed Volume:
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Same as Draw Volume
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Collection:
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Routine venipuncture, mix thoroughly by gentle inversion. Immediately wrap specimen in foil to protect from light and transport to the lab.
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Special Processing:
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Lab Staff: Do not centrifuge.
A Hematocrit value performed within 24 hrs of collection of the RBC Folate specimen is required with the submission of the sample to Mayo. If a Hematocrit has not been done, order one on this specimen before processing for Mayo. You will be prompted for the Hematocrit value in Mayo Access.
Transfer 1 mL specimen into a Mayo amber vial (Supply T192). Freeze specimen immediately. Store and ship at frozen temperatures. Forward promptly.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabeled specimens; specimens other than EDTA whole blood; non-frozen or clotted specimens
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Interpretive
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Reference Range:
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Age:
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Range: (ng/mL)
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All ages
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280 – 903 ng/mL
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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Chemiluninescent Immunoassay
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References:
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Mayo Medical Laboratories (August 2012)
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ARUP (August 2012)
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Nathan DG, Oski FA (1981) Hematology of Infancy and Childhood, Philadelphia, PA, WB Saunders Company
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Updates:
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9/23/2010: Mayo discontinued testing and does not feel this is a reliable test. Mayo now forwards to Quest Diagnostics. Please note specimen requirement change, method change, processing and reference range changes.
9/28/2010: Mayo now forwarding to ARUP, note reference range change.
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