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- Folates, RBC and Serum (With Hct)
RBC folate; serum folate; hematocrit
Detect folate deficiency; monitor therapy with folate; evaluate megaloblastic and macrocytic anemia
Folates: Electrochemiluminescence immunoassay (ECLIA); Hematocrit: Automated cell counter
RBC folate: 499−1504 ng/mL; serum folate: >3.0 ng/mL
Whole blood (two tubes) and serum
Two full lavender-top (EDTA) tubes and one red-top tube or gel-barrier tube
Verify that the patient has not had vitamins containing folic acid during the previous three to five days; if so, consult the physician.
Transfer 7 mL from one whole blood tube into a plastic transport tube and freeze. Refrigerate second whole blood tube. If a red-top tube is used, transfer separated serum to a plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Freeze whole blood transport tube and refrigerate all other specimens.
Causes for Rejection
No frozen whole blood; no refrigerated whole blood; plasma specimen; hemolysis; transport tubes with whole blood for the hematocrit portion
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
|Order Code||Order Code Name||Order Loinc||Result Code||Result Code Name||UofM||Result LOINC|
|285700||Folate, RBC and Serum||266019||Folate, Hemolysate||ng/mL||2282-2|
|285700||Folate, RBC and Serum||005058||Hematocrit||%||4544-3|
|285700||Folate, RBC and Serum||266022||Folate, RBC||ng/mL||2283-0|
|285700||Folate, RBC and Serum||002020||Folate (Folic Acid), Serum||ng/mL||2284-8|