Skip to main content

Department

Biochemistry

Preferred Sample Type

Folate

Suitable Specimen Types

  • Serum
5-10 ml vacutainer (minimum sample volume 75 uL)

Sample Processing in Laboratory

Usual

Sample Preparation

Centrifuge

Turnaround Time

< 1 day

Sample Stability

Serum collected using plain or gel tubes or Lithium heparin plasma may be used. Do NOT use EDTA plasma.

Samples should be clot-free and free of red cells or other particulate matter.

If testing is delayed, store at 2-8˚C up to 1 day on gel separator or 2 days without. For longer periods, store serum frozen at -20˚C.

Folate

General Information

Folate and folic acid are forms of a water-soluble B vitamin. Folate occurs naturally in food. Folic acid is the synthetic form of this vitamin that is found in supplements and some fortified foods.

 

It has the following functions:

 

-Plays an essential role in the formation of DNA and RNA

 

-Assists function of vitamin B12.

 

-Assists formation of 'haem' (the iron content of haemoglobin')

 

-Necessary for the formation of red and white blood cells

 

Signs of folic acid deficiency are often subtle. Diarrhea, loss of appetite, and weight loss can occur. Additional signs are weakness, sore tongue, headaches, heart palpitations, irritability, and behavioral disorders. Women with folate deficiency who become pregnant are more likely to give birth to low birth weight and infants, and infants with neural tube defects. In adults, anemia is a sign of advanced folate deficiency. In infants and children, folate deficiency can slow growth rate. Some of these symptoms can also result from a variety of medical conditions other than folate deficiency. It is important to have a physician evaluate these symptoms so that appropriate medical care can be given.

 

A deficiency of folate can occur when your need for folate is increased, when dietary intake of folate is inadequate, and when your body excretes (or loses) more folate than usual. Medications may interfere with your body's ability to use folate and may also increase the need for this vitamin.

 

Patient Preparation

5 mg/day) should be taken at least 8 hours post dose.

 

Patients receiving treatment with methotrexate or leucovorin are contraindicated due to cross reactivity of folate binding proteins with these compounds.

 

 

Notes

Samples should be clot-free and free of red cells or other particulate matter. The presence of fibrinn may cauuse erroneous results.

Reference Range

3.1 - 20.5 ug/L (Source: Abbott laboratories)

 

 

 

Specifications

  • EQA Scheme?: Yes
  • EQA Status: NEQAS