25-羟基维生素D测试是什么？

维生素Dhelps your body absorb calcium and maintain strong bones throughout your entire life. Your body produces vitamin D when the sun’s UV rays contact your skin. Other good sources of the vitamin include fish, eggs, and fortified dairy products. It’s also available as a dietary supplement.

维生素Dmust go through several processes in your body before your body can use it. The first transformation occurs in the liver. Here, your body converts vitamin D to a chemical known as 25-hydroxyvitamin D, also called calcidiol.

The 25-hydroxy vitamin D test is the best way to monitor vitamin D levels. The amount of 25-hydroxyvitamin D in your blood is a good indication of how much vitamin D your body has. The test can determine if your vitamin D levels are too high or too low.

该测试也称为25-OH维生素D检验和钙二酚25-羟基核酸脂蛋白测试。它可能是重要的指标osteoporosis（骨头无力）和疳(bone malformation).

Your doctor may request a 25-hydroxy vitamin D test for several different reasons. It can help them figure out whether too much or too little vitamin D is causing bone weakness or other abnormalities. It can also monitor people who are at risk for having a维生素D缺乏。

那些处于低水平维生素D的高风险的人包括：

  • 没有太多阳光的人
  • older adults
  • people with obesity
  • 仅母乳喂养的婴儿（通常用维生素D加强配方）
  • 接受过胃搭桥手术的人
  • people who have a disease that affects the intestines and makes it difficult for the body to absorb nutrients, such as克罗恩病

如果您的医生已经诊断出您患有维生素D缺乏症，并且想看看治疗是否有效，您的医生也可能希望您进行25-羟基维生素D测试。

您的医生会告诉您在测试前四到八个小时不要吃任何东西。

25-羟基维生素D测试需要进行常见的血液检查。您的医疗保健提供者将使用针头从手臂的静脉中抽血。快速的手指刺可能会为儿童和婴儿的血液样本提供足够的能力。

结果将取决于您的年龄，性别和所使用的测试方法。结果也可能因实验室而异。

According to the 饮食补品办公室（ODS） ，维生素D的水平通过纳米尔/升（NMOL/L）或纳米图/毫升（NG/mL）的25-羟基水平测量。结果可以表明以下内容：

  • 缺陷：小于30 nmol/l（12 ng/ml）
  • 潜在缺陷：在30 nmol/L（12 ng/ml）和50 nmol/L（20 ng/ml）之间
  • normal levels: between 50 nmol/L (20 ng/mL) and 125 nmol/L (50 ng/mL)
  • 高水平：高于125 nmol/l（50 ng/ml）

If your vitamin D levels are low and you’re having symptoms of bone pain, a doctor may recommend a special scan to checkbone density。医生使用这种无痛的扫描来评估一个人的骨骼健康。

Low blood levels of 25-hydroxy vitamin D usually mean one (or more) of the following:

  • you aren’t eating a balanced, complete diet
  • 您的肠道无法正确吸收维生素
  • you’re not spending enough time outside to absorb adequate vitamin D levels through sun exposure

一些证据将维生素D缺乏症与某些癌症，免疫疾病和心血管疾病的风险更高。

High vitamin D blood levels generally result from taking too many vitamin pills and other nutritional supplements.High doses of vitamin D可能导致一种称为高效的疾病D.高胜态性是一种罕见但严重的疾病，可能会使您有肝脏或肾脏问题的风险。

High levels are rarely due to consuming too much of the vitamin through foods or sun exposure.

您的医生将帮助解释测试的结果，并确定您是否缺乏维生素D缺乏。

As with any routine blood test, risks of the 25-hydroxy vitamin test are minimal and include:

  • 过多的出血
  • lightheadedness
  • 小针刺刺穿皮肤的略有感染的机会

维生素D对身体至关重要。任何年龄的缺陷都会引起问题。如果您非常缺乏，您的医生可能会建议补充剂或其他治疗选择。除了在方案中添加补充剂外，还可以食用含有维生素D的食物，可以帮助保持维生素D含量稳定。