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Review of Urea and Renal Function (Nursing)

by Rhonda Lawes

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    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.


    About the Lecture

    The lecture Review of Urea and Renal Function (Nursing) by Rhonda Lawes is from the course Serum Creatinine – Renal Assessment (Nursing).


    Author of lecture Review of Urea and Renal Function (Nursing)

     Rhonda Lawes

    Rhonda Lawes


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