00:01
Hi!
Welcome to our interpreting
lab value series.
00:04
In this one we're going
to take a look at the BUN
to creatinine ratio.
00:09
Now hold on because I'm going
to share some actual lab values
from my most favorite aunt and
you're going to think I made them up.
00:17
But I promise you
this was real life.
00:20
So first, let's look at
urea and renal function.
00:23
Remember urea is nitrogen.
00:25
It contains nitrogen,
its water soluble
and it's a waste product.
00:30
So if I have healthy kidneys
normally should filter urea
from my bloodstream into
my urine to exit my body.
00:39
When I have normal renal
and liver function,
I should have a creatinine
between 7 and 20,
keeping in mind normal
ranges vary by lab
but that's a good reference
range for you 7 to 20.
00:51
Now when the BUN
becomes elevated now,
we've got something that
we need to dig deeper into.
00:57
There's three main categories
remember organ dysfunction,
High protein or
significant dehydration,
not just "oh,
I'm a little thirsty"
that's a sign of
significant dehydration
for it to be elevated.
01:11
So liver or renal dysfunction,
that's the organ
dysfunction category,
extra protein,
which had come from a really extreme
dietary intake or GI bleeding
because remember hemoglobin in
red blood cells is a protein
and if I'm leaking
blood into my GI tract
that's going to cause an
elevated level of protein.
01:32
The last one is
significant dehydration.
01:35
So normal levels just to
give you a quick reminder.
01:38
Remember men are a little
bit higher than women, why?
Creatinine deals with muscle
and men tend to have a little higher
muscle percentage in their body makeup.
01:47
So men are .6 to 1.2
and women are .5 to 1.1.
01:52
Hey an easy way to remember
that 2 times 6 is 12.
01:56
So I always remember
men is point .6 to 1.2
and then I know the women are
just a little bit beneath it.
02:03
I will take any help I can
get a remembering lab values
because that's a lot of numbers
that runs around in your brain.
02:09
So if that works for you,
you're welcome to use it.
02:13
Now remember serum creatinine is
another chemical waste product.
02:16
It's produced by
muscle metabolism.
02:19
That's why men have a
little bit higher level
but your kidneys when they're
healthy filter this out as well
from your blood into your
urine to leave your body.
The lecture Review of Urea and Renal Function (Nursing) by Rhonda Lawes, PhD, RN is from the course Serum Creatinine – Renal Assessment (Nursing).
Which factor is a possible cause of an elevated blood urea nitrogen level? Select all that apply.
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