你如何准备血液测试？

一些血液测试需要你快forehand. In these cases, your doctor will instruct you not to eat or drink anything, except water, in the hours leading up to the test.

Fasting before certain blood tests is important to help make sure that your test results are accurate. The vitamins, minerals, fats, carbohydrates, and proteins that make up all food and beverages can impact blood-level readings, clouding the results of your test.

Not all blood tests will require you to fast beforehand. Blood tests that you will likely need to fast for include:

如果您的医生为您规定了新的血液测试，或者没有提及您是否应该快或多长时间，请询问它们是否需要禁食。一些测试，例如粪便隐匿性血液测试，不需要禁食，但会限制某些食物。红肉，西兰花，甚至一些药物可能会导致错误的阳性测试。准备测试时始终遵循医生的建议。

The amount of time you need to fast for will vary depending on the test. For most tests, you will be told not to consume anything but water for eight hours leading up to the test. For a few tests, a 12-hour fast may be needed.

Even if you drink it black, coffee can interfere with blood test results. That’s because it contains caffeine and soluble plant matter, which might skew your test results.

咖啡也是一个diuretic，这意味着它会增加你的小便。这可以具有脱水效果。你的水分越少，越难以为护士或其他医学专业人员做血液检查来找到静脉。这可以使血液测试更难或更加压力。

Some blood tests, such as those that assess liver health or triglyceride levels, may require you to not drink any alcohol for a full 24 hours. Trace amounts of alcohol can remain in your bloodstream for several days. If you have any concerns about alcohol consumption, discuss this with your doctor when you schedule your test.

如果您可以在测试前抽烟，或者如果您应该在快速时避免吸烟，也请询问您的医生。

除非你的医生另有说明，否则在验血前饮用水很好。这与一些外科手术不同，这可能需要你完全空的胃。

Tap or bottled water are both OK, but leave the squeeze of lemon for another time. Seltzer and club soda are off-limits. Carbonated beverages, flavored or otherwise, shouldn’t be consumed during a fast, and neither should any type of tea.

Just like adults, children may need blood tests that require them to fast beforehand. If so, your child’s pediatrician will let you know how long your child should abstain from eating and drinking.

如果您怀孕，您可能需要几种血液测试。这些旨在评估任何潜在的健康问题，您或您的宝宝在怀孕期间可能会经历或出生后。其中一些测试将要求您快速前进。您的医生将建议您如何为每个测试做准备。

Fasting is usually safe if you’re pregnant, provided you’re in good health and aren’t having a high-risk pregnancy. For your overall comfort, your doctor may advise you to drink extra water or to remain indoors, especially if the weather is very hot or humid.

禁食可能增加胃灼热in some pregnant women. If you experience uncomfortable or concerning symptoms of any kind while you’re waiting to have your blood drawn, let your doctor know immediately.

If you’re seeing a doctor other than your obstetrician-gynecologist, make sure they are made aware of your pregnancy before your blood test.