I was fasting overnight for a blood test but then had one cup of coffee with sugar. How long must I wait before I do the blood test?

I was fasting overnight for a blood test but then had one cup of coffee with sugar. How long must I wait before I do the blood test?

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  1. Higher habitual coffee consumption was associated with higher insulin sensitivity and a lower risk for type 2 diabetes in diverse populations. In contrast, short-term metabolic studies showed that caffeine intake can acutely lower insulin sensitivity and increase glucose concentrations. Randomized intervention studies are needed to examine whether tolerance to these acute effects develops after longer-term consumption. We therefore examined the effects of coffee and caffeine on fasting blood concentrations of glucose and insulin over 2–4 weeks in two crossover studies in healthy volunteers.
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  2. In search for an answer to this question. I had a small cup this morning and scheduled to have blood work this morning. I’m thinking I can go for my blood work in 3 hrs after drinking it.

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  3. It depends upon what test was being performed. If it was for serum glucose, then 8 hours would probably be long enough to wait. But that is a long time to be fasting otherwise, so it would be more practical to eat normally and then reschedule your venipuncture for the next day (after an overnight and morning fast).
    For most other blood tests, it would probably not make too much difference. For instance, if the test was for serum lipids, one sugar packet would not significantly affect the results, although adding cream might do so.

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  4. 24hrs, you should do the test tomorrow. That’s one more night of fasting. You are most likely going for a fasting blood test, which is meant to measure levels of whatever element in your system without any external factor contributing to it. Drinking coffee with sugar is an external factor and would definitely tamper with the results of the test-if it was done. So best thing is go do the test tomorrow and make sure you don’t eat or drink anything tonight. That’s why it is called Fasting.
    Cheers.

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  5. Not every type of blood work requires you to fast beforehand. But certain common blood tests do require fasting. These include glucose and sometimes, triglyceride tests. Tests for glucose measure your blood sugar, while those for triglycerides measure part of your cholesterol lipid panel.
    Coffee before a glucose test can affect the results, especially if you add cream and sugar, according to Mercy Health, a chain of hospitals and health care clinics in Ohio and Kentucky. Added sugar and fat from the cream can make your test results inaccurate. Even without these ingredients, however, coffee and a blood sugar test don’t go well together.
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  6. Learning how different habits can cause your blood sugar to fluctuate can help you better predict how your levels will swing. Both low and high blood-sugar levels lead to serious health consequences. High blood sugar may cause nausea, vomiting, or shortness of breath, while low blood sugar may cause confusion, dizziness, blurred vision, seizures, unconsciousness, or even death, McDermott explains.
    Managing the factors that can influence blood sugar can be a balancing act. Even if you keep careful tabs on what you eat and take your medication conscientiously, you will inevitably see fluctuations in your day-to-day levels.
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  7. This criterion is different for different tests.
    Different blood tests have the different procedure to follow and also have different preconditions, better you ask your lab tester for this before the test, because a test like blood sugar, the results will totally change if you take any drink except water even after fasting overnight. Same happens for Lipid profile test.
    So ill advise you to either go through google for your test preconditions or consult a lab tester, otherwise wrong results may lead to a problem in treatment (if required) and also money wastage.
    Hope my advice is helpful to you..

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