叶酸试验
定义
Folic acid is also called vitamin B9. This article discusses the test to measure the amount of folic acid in the blood. It is often done together with a vitamin B12 test of the blood.
选择的名字
叶酸试验
How the Test is Performed
A
How to Prepare for the Test
You should not eat or drink for 6 hours before the test. Your health care provider may tell you to stop taking any drugs that may interfere with test results, including folic acid supplements.
Drugs that can decrease folic acid measurements include:
- 酒精
- 氨基水杨酸
- Birth control pills
- 雌激素
- 四环素
- 氨苄青霉素
- 氯霉素
- 红霉素
- 甲氨蝶呤
- 青霉素
- 氨喋呤
- 苯巴比妥
- 苯妥英
- Drugs to treat malaria
How the Test will Feel
You may feel slight pain or a little sting when the needle is inserted. There may be some throbbing at the site.
Why the Test is Performed
This test is done to check for
Folic acid helps form red blood cells and produce DNA that stores genetic codes. Taking the right amount of folic acid before and during pregnancy helps prevent neural tube defects, such as spina bifida.
Women who are pregnant or planning to become pregnant should take at least 600 micrograms (mcg) of folic acid every day. It may be provided by prenatal vitamins and certain foods, such as enriched bread, flour, and cereal. Some women may need to take more if they have a history of neural tube defects in earlier pregnancies. Ask your provider how much you need.
正常的结果
The normal range is 2.7 to 17.0 nanograms per milliliter (ng/mL) or 6.12 to 38.52 nanomoles per liter (nmol/L).
Normal value ranges may vary slightly among different labs. Talk to your provider about the meaning of your test results.
The examples above show the common measurements for results for these tests. Some labs use different measurements or may test different specimens.
What Abnormal Results Mean
Lower-than-normal folic acid levels may indicate:
- 不良的饮食习惯
吸收不良 syndrome (for example,乳糜泻 )营养不良
The test may also be done in cases of:
贫血 that may be due to folate deficiency- Megaloblastic anemia
风险
There is very little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other slight risks from having blood drawn may include:
- 大出血
- Fainting or feeling lightheaded
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
参考文献
安东尼交流. Megaloblastic anemias. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8日艾德. Philadelphia, PA: Elsevier; 2023:chap 40.
Elghetany MT, Banki K. Erythrocytic disorders. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 33.
梅森JB，布斯SL. Vitamins, trace minerals, and other micronutrients. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26日艾德. Philadelphia, PA: Elsevier; 2020:chap 205.
审核日期: 02/02/2023
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