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Folate RBC

Order Code L717
Turnaround Time 4 days
Test Includes

Folate RBC and HCT

Specimen Requirements
Specimen Source
Whole blood
Transport Container
(Specimen Container)

EDTA (lavender-top) tube at Room Temperature.

Preferred Specimens
Whole blood
Minimum Volume (uL)
0.2 mL
Collection Instructions
(Transport Temperature)
Transport Refrigerated (cold packs)
Specimen Stability
Temperature Period
Room temperature Folate = 5 days; Hematocrit = 48 hours
Refrigerated Folate = 5 days; Hematocrit = 48 hours
Frozen Folate = 60 days; Hematocrit = Unnacceptable
Special Instructions

Both the HCT and folate will be performed on this tube. If sample is sent frozen, a default hematocrit will be used for calculation of the RBC folate. Do not freeze as this will affect the HCT. Whole blood collected in an EDTA (lavender-top) tube sent at room temperature will have folate and hematocrit testing performed. Note: HCT testing cannot be performed on a frozen specimen. A default HCT result will be used for calculation of the RBC folate value.

Test Details
Immunoassay (IA)
Clinical Significance

Folate, RBC – Folate levels have diagnostic significance in nutritional deficiencies, especially in cases of severe alcoholism, function damage to the upper third of small bowel, pregnancy and various forms of megoblastic anemia. Since serum folate levels are subject to rapid changes reflecting diet and absorption, RBC folate may be a better diagnostic tool since the levels remain fairly constant.

Reference Ranges

>280 ng/mL RBC