If you are asked to do a fasting blood sugar [to food fro 12 hours] they
will be able to get your reading over time.  Locarb will help lower your
blood glucose level.
Type 2 diabetes runs in the family sometimes because of habits learned from
family.  Diet has helped me control my blood sugar levels and any Doctor
will tell you lose 5% of your body weight and your readings will be lower.

The following tests are used for diagnosis:

A fasting plasma glucose test measures your blood glucose after you
have gone at least 8 hours without eating. This test is used to detect
diabetes or pre-diabetes.

An oral glucose tolerance test measures your blood glucose after you
have gone at least 8 hours without eating and 2 hours after you drink
a glucose-containing beverage. This test can be used to diagnose
diabetes or pre-diabetes.

In a random plasma glucose test, your doctor checks your blood glucose
without regard to when you ate your last meal. This test, along with
an assessment of symptoms, is used to diagnose diabetes but not
pre-diabetes.

Positive test results should be confirmed by repeating the fasting
plasma glucose test or the oral glucose tolerance test on a different
day.

Since you will fast before you take the FPG (the most common initial
test), LC will not mask diabetes. If LC is curbing your diabetes, then
it won't matter as long as you stay on LC.

If you want to know for absolutely sure, get off LC for a week or two
prior to visit.

http://antwrp.gsfc.nasa.gov/apod/ap991014.html
Lift well, Eat less, Walk fast, Live long.

If you just have a regular blood test while low carbing, it might not
show if you have increased blood glucose while eating carbs. The only
way to find out if you do is to have a glucose tolerence test, which
will load you with carbs and isn't lc at all.

You may have other symptoms if your blood sugar has been elevated over
a period of time and your doc may pick up on those. If you are at all
concerned that you may be diabetic or headed that way, take the time
to have the testing done and then you'll know for sure where you
stand. One day off of lc is worth it, IMO.

http://www.geocities.com/jenny_the_bean/risk.htm discusses how you can test
yourself at home to see if you are diabetic.

If you have been low carbing for more than a month and keeping your carbs
under 60 grams a day, you probably won't show up as diabetic on any test but
a glucose tolerance test.

Unfortunately, as my article explains, many doctors diagnose diabetes using
a test that only shows up positive after you have been running abnormal
blood sugars for many years and they have already damaged your organs, in
some cases, irreversibly.

Everyone who is concerned about whether they are diabetic should make sure
that their doctor is doing more than a fasting glucose test when he or she
assures them that they are "normal."  The fasting glucose test can stay
normal for years when you are actually diabetic.

-- Jenny  - Low Carbing for 4 years. At goal for weight. Type 2 diabetes,
hba1c 5.2.
Cut the carbs to respond to my  email address!

Low carb facts and figures, my weight-loss photos, tips, recipes,
strategies for dealing with diabetes and more at
http://www.geocities.com/jenny_the_bean/

Looking for help controlling your blood sugar?
Visit  http://www.alt-support-diabetes.org/Newly%20Diagnosed.htm

If you have been eating high-carb for a lifetime, chances are that
you've got some degree of insulin resistance built up. Elevated blood
glucose stresses and kills insulin receptors causing insulin
resistance. As a result, your pancreas may be having to produce larger
than normal amounts of insulin.

This may show up if they check you for diabetes. You may show signs of
metabolic syndrome, pre-diabetes or diabetes itself.

The best thing for you to do is keep on LCing. Eventually your insulin
receptors may recover and your pancreas will go back to its normal
insulin production. Let's hope you haven't caused yourself too much
damage.

TC