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Doctor insights on: Can You Drink Water Before A Fasting Blood Glucose Test

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Is it safe to drink water when you are fasting for a glucose blood test?

Is it safe to drink water when you are fasting for a glucose blood test?

Yes: Water is fine before a blood glucose test, but don't eat any food or drink other liquids which might falsely elevate the glucose level in the blood. ...Read more

Blood Sugar (Definition)

The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. The body naturally tightly regulates blood glucose levels as a part of metabolic homeostasis. Glucose is the primary source of energy for the body's cells, and blood lipids (in the form of fats and oils) are primarily ...Read more


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I've got a glucose blood test tomorrow morning and have to fast 10 hours before and was wondering whether you can drink water?

Yes: Water is fine; nobody wants you to be dehydrated just for some blood tests, but they don't want you to take any food or other fluids which may elevate your blood sugar. ...Read more

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When your done drinking the glucose drink are you allowed to drink water before giving blood?

When your done drinking the glucose drink are you allowed to drink water before giving blood?

GTT: If you are talking about glucose tolerance test, you may drink a little water after the glucose drink. Consult this site for information, especially about preparing for the test.
http://www.mayoclinic.org/tests-procedures/glucose-tolerance-test/basics/definition/prc-20014814 ...Read more

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How much water is okay to drink before fasting glucose test ?

How much water is okay to drink before fasting glucose test ?

Not a big deal: The amount of water is not terribly important - 12-16 oz should be fine. Be sure you are fasting (not eating) for the required number of hours. ...Read more

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Can i drink water before a fasting blood sugar test?

Can i drink water before a fasting blood sugar test?

Yes: Water has no carbohydrates (the part of food that causes a rise in blood sugar) so there is no reason you can't drink it before a blood sugar test. ...Read more

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When fasting for 12 hrs to do a blood test can u drink water ?

When fasting for 12 hrs to do a blood test can u drink water ?

Fasting Blood Test: Yes, you can drink water and eat no food for your test. ...Read more

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When fasting for metabolic blood test can I drink water?

Yes: Plan water no lemon or additives can be taken before a fasting blood test. ...Read more

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Am i allowed to drink water while fasting for a blood sugar test?

Yes: In fact you should drink a normal amount of non-caloric liquids to avoid becoming dehydrated, which can elevate blood sugar. ...Read more

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Help please. Could drinking pepsi max before a blood glucose test effect the results?

Help please. Could drinking pepsi max before a blood glucose test effect the results?

Yes it can: Pepsi Max does not contain sugar. Pepsi Zero Sugar (previously known as Diet Pepsi Max & Pepsi Max is sweetened with aspartame. Diarrhea is a possible side effect of aspartame & Sucralose. REF: http://www.livestrong.com/article/450435-diet-soda-diarrhea/ However, some people have a release of insulin after ingesting these artificial sweeteners & this can lead to drop in blood sugar level. ...Read more

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Can drinking water dilute glucose test ?

Water and glucose: When you drink water, your body gets rid of the excess (through urination) quickly. It is very hard to dilute your blood, and your glucose is not affected by water intake. ...Read more

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Is it okay to drink water when fasting for blood work?

Is it okay to drink water when fasting for blood work?

Yes: Drinking water is fine unless directed specifically by your physician to avoid it. Fasting lab is looking for blood sugar and cholesterol which would be affected by coffee, food, and milk. I usually recommend to my patients to take their routine meds even when fasting except for medications that would affect the blood sugar. ...Read more

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Fasting blood sugar 181.8, hba1c > 7%, taking all vitamins, exercise 6 hrs/week, eat no sugar, eat high fibre, drink water, juice, wt. 67kilo, ht 5'5"?

Fasting blood sugar 181.8, hba1c > 7%, taking all vitamins, exercise 6 hrs/week, eat no sugar, eat high fibre, drink water, juice, wt. 67kilo, ht 5'5"?

Look into Paleo : Your lab numbers suggest you're on the path to diabetes. Even though you don't eat "sugar" any fiber or starch that your body can digest turns into sugar and fruit juice is sugar. Even things like diary that is thought of as healthy has sugar (lactose is a type of sugar). A person with lab numbers like yours has to limit all sugars and heal the damage. The paleo approach can help you do both. ...Read more

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For two weeks I haven't felt hunger or thirst but I drink water and eat once a day anyway. My doctor does not know what it is. I took blood test today?

For two weeks I haven't felt hunger or thirst but I drink water and eat once a day anyway. My doctor does not know what it is. I took blood test today?

Watch this: Relax, Fred. This is fairly common and means nothing. You can reassure yourself about your physical health by going a day or so just drinking water; you'll get hungry. I suspect there's something going on in your life that may be making you sad; if you start having a sleep disturbance or sad moods, this may be dysthymia / depression for which early treatment's important. ...Read more

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Doc said i had ketonuria and in my blood test i had low potasium i eat normally and drink water so why is that?Doctor said i need urine test again

Doc said i had ketonuria and in my blood test i had low potasium i eat normally and drink water so why is that?Doctor said i need urine test again

This is serious: Anyone can have +1 ketones in the urine from missing a meal, but more is worrisome. Please repeat. Low blood potassium reflects illness rather than habits or lifestyle. I am trusting you are not taking any medications that might cause this. A good history and phyiscal exam is next, and likely some checks of hormones and renal concentrating ability / tubular function. ...Read more

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How can the amount of water you drink affect blood glucose levels?

How can  the amount of water you drink affect blood glucose levels?

Dehydration: Can increase blood sugar if you have diabetes. Water intake will temporarily dilute your blood sugar level, but only for a very, very short time before your body readjusts. ...Read more

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If having blood work done for physical in morning can you drink water before? Doctor said no food or coffee

If having blood work done for physical in morning can you drink water before? Doctor said no food or coffee

Yes: Fasting labs are generally aimed at looking at blood lipid and glucose levels. These would generally be unaffected by moderate water intake prior to testing. Actually, being dehydrated when the sample is drawn may more likely cause abnormal values.

A caution would be if you were to drink excessive amounts of water and diluted your blood. This would be unlikely in normal circumstances. ...Read more

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I drink water regularly and sometimes soda but I went to pee and it had blood in my pee?

I drink water regularly and sometimes soda but I went to pee and it had blood in my pee?

Time for a trip...: When there is blood in the pee, regardless of what one is drinking, it's time to take a trip to one's primary care doctor. Blood can be real blood, as in bladder infections, bladder tumors, reactions after strep infections, etc... Occasionally, urine can look bloody (but is not real blood, but is color from muscle breakdown products) after a strenuous athletic event. ...Read more

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I get horrible migraines whenever i donate blood or have it drawn. i always make sure to eat before and after and drink water. could this mean anythin?

I get horrible migraines whenever i donate blood or have it drawn. i always make sure to eat before and after and drink water. could this mean anythin?

Mind over body: If even a small lab draw can trigger you, then it is not something like volume depletion...it is your eyes, or pain response, or thought process that is likely triggering a physiologic response (aka: stress or "fight/flight") and those hormones are contributing to triggering your migraine. Should talk to your Dr and consider positive imagery / biofeedback / similar PREEMPTIVELY to minimize/stop. ...Read more

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I'm having headaches everyday their mild last 20 minutes i don't drink water is it that i also cough up blood here and there?

I'm having headaches everyday their mild last 20 minutes i don't drink water is it that i also cough up blood here and there?

See doctor....: Coughing blood, called hemoptysis, is a symptom that always requires evaluation by a doctor. The most common etiology of hemoptysis is bronchitis but it can also be caused by malignancy. Your age and your non-smoker status goes against malignancy but the etiology of the hemoptysis must be diagnosed and treated. So, see your doctor so the hemoptysis can be diagnosed and treated. ...Read more

Dr. Cayce Jehaimi
2,607 doctors shared insights

Glucose (Definition)

Glucose is the basic sugar molecule and the source of energy throughout the living kingdom. We are programmed to easily detect it by taste in our foods as it is desirable but can be overdone with the modern diet. It gets out of control ...Read more


Dr. Gary Pess
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Blood Sugar Monitoring (Definition)

Blood glucose monitoring refers to the ongoing measurement of blood sugar (glucose). Monitoring can be done at any time using a portable ...Read more