4 doctors weighed in:
Could you tell me what happens if you have diabetes and eat before a blood test?
4 doctors weighed in

Dr. James Chu
Internal Medicine - Endocrinology
2 doctors agree
In brief: Post-prandial result
Although most blood tests are supposed to be done in the fasting state, the after-meal (or post-prandial) glucose result can be very useful in certain settings.
If you have diabetes and do a blood test after eating, the result can help determine whether you are eating too much carbs or need medication adjustments. American diabetes assn recommends a post-prandial glucose target less than 180 mg/dl.

In brief: Post-prandial result
Although most blood tests are supposed to be done in the fasting state, the after-meal (or post-prandial) glucose result can be very useful in certain settings.
If you have diabetes and do a blood test after eating, the result can help determine whether you are eating too much carbs or need medication adjustments. American diabetes assn recommends a post-prandial glucose target less than 180 mg/dl.
Dr. James Chu
Dr. James Chu
Thank
Dr. Gutti Rao
Internal Medicine - Hospital-based practice
In brief: Depends
Depends what test you want to do.
If you are checking your sugar, it is likely go up. If you are checking you triglycerides, it may go up as well. Other tests should not have any impact after eating.

In brief: Depends
Depends what test you want to do.
If you are checking your sugar, it is likely go up. If you are checking you triglycerides, it may go up as well. Other tests should not have any impact after eating.
Dr. Gutti Rao
Dr. Gutti Rao
Thank
Get help from a real doctor now
Dr. Peter Kurzweil
Board Certified, Internal Medicine
46 years in practice
16M people helped
Continue
107,000 doctors available
Read more answers from doctors