you really do need to see your doc and ask him this specific question as anything we could give you in the way of advice most likely would not help as what you were told might mean many different things.The only thing that I am possibly thinking here would be that your creatinine may be slightly elevated.it is probably the best overall test that ...
The first three digits of a ZIP code refer to a sectional center or a large city. The last two digits refer to a specific post office facility or delivery area. In ZIP+4 format, a hyphen is required to separate the first five and last four of a ZIP code. The first two of the +4 code refer to a sector or a few blocks. The last two of a +4 code refer to a specific segment or one side of a street.
Some still refer to ZIP codes as US postal codes. The term ZIP stands for Zone Improvement Plan. The basic 5-digit format was first introduced in 1963 and later extended to add an additional 4 digits after a dash to form a ZIP+4 code. The additional 4 digits help USPS more precisely group mail for delivery.