Why tests on blood are doing on an empty stomach?

 As for a most parts are tests not needing limiting, but a few are doing on an empty stomach and wake on on an early time, and this is importance needing.

And such method is needing lowering probably  error  in diagnostic and to interpretation  her results, and this is happening in blood test.

As manufacturing hormones, ferments activity and cells quantity in periphery blood changing within a day, and after meal happening fast changes.And doctor in decoding analyses compares your dates with a conventional norm,and these are averaging results for a healthy person, which done blood test is on an empty stomach, and norm for an evening test or analyses after eaten sandwich is not having. And other ,that a widen borders for norm usually forgive error in the meal, time a day, and your result will be in a limit for tolerance and even shifting a little up or down, but an importances exclusions having.

On which are affecting a time of the day?

And a first are on a hormones level, and hormones test level better doing on a half first day,thus result will be a weak informative. Concentration somatotropic  hormone cortisol and  adrenocorticotropic  hormone are on the morning and evening very difference on 2-4 times, daily differences hormones for thyroid glands are leading 20 perc. from a middle level, and testosterone can raise and lowering within a day on the half. And also urine test is very sensitive within a day, and for right result getting taking urine is on the morning as right away after waking up. Second and following portions are differencing by an own structure, thus a sleep before analyse need to have 6-8 houses as against urine bladder filling urine with a right concentration of diluting substances. And if you are staying awaking a morning urine is not differencing from a daily or evening and here are hormones fault.