Sign in →

Test Code FOL Folate

Important Note

Specimens should be protected from light, but can be accepted unprotected from light for up to 8 hours.

Additional Codes

Cerner

NextGen

Folate

Folate

Alternate Name(s)

  • Folic Acid
  • Pteroylglutamic acid

Useful For

Folates are a subset of vitamins related to pteroylglutamic acid (PGA) that function as co-enzymes in metabolic reactions involving the transfer of single carbon units.  Folate and vitamin B12 are necessary for DNA synthesis, and consequently normal red blood cell maturation. Folate deficiency can lead to macrocytic (megaloblastic) anemia.  Folate is obtained from dietary sources including fruits, green and leafy vegetables, yeast and organ meats.  Folate is absorbed from the small intestine and stored in the liver. Low folate intake, malabsorption as a result of gastrointestinal diseases, pregnancy, and the use of drugs such as Phenytoin, oral contraceptives and excessive concentrations of alcohol are causes of folate deficiency. Low serum folate concentrations are an early indication of folate depletion and precede depletion in the tissues. Adequate folate concentrations during pregnancy are also important in the prevention of neural tube defects (NTD) in infants.

Methodology

Competitive binding assay

Patient Preparation

None

Collection Instructions

  • Standard phlebotomy practices.
  • Protect specimen from light.

Specimen Requirements

Container

Specimen Type

Tube

Lithium Heparin Plasma

PST

 or  or 

Serum

 or 

SST

 or  or 

 

Stability

Storage

Temperature

Stability

Room Temperature

18-28°C

Not recommended

< 8 hours if unprotected from light

Refrigerated

 2-8°C

≤ 7 days

< 8 hours if unprotected from light

Frozen

≤-20 °C

4 weeks

< 8 hours if unprotected from light

Thaw 1 time only

Rejection Criteria

  • Gross Hemolysis
  • Turbid Specimens

Result Reporting and Reference Values

Reported in ng/mL

Age

Low

Normal

0-4 years

Not Established

4- 150 years

<4.0

>4.0

Reflex Testing

None

Limitations

  • Ortho reports a bias with the following:
    • Biotin can cause a positive bias
  • Ortho reports no significant effect with the following:
    • Bilirubin up to 12 mg/dL