ENORMOUS difference in kidney values when using cystatin C vs the standard BUN + Creatinine

[jtmarlin]

My BUN and creatinine always seem to be creeping up over the last 4 years since I've been on TRT and cycling (I'm not huge by any means) and it concerned me. I just had a panel run and my numbers are wildly different depending on the test. I also take 5g creatine per day.

BUN 29 (6-24 lab range)
Creatinine 1.55 (.76-1.27)
egfr 57 (sub 59 is low)

Now w/cystatin C

Cystatin C .68 (.6-1) lower is better
egfr 122!!!!!!

It's mind blowing to me that one kidney function test that is used overwhelmingly by doctors shows my egfr just under normal and the cystatin C test shows my egfr thru the roof w/pristine kidney function. Have any of you seen such a huge difference in your own bloods?

 

[roofer22]

I just saw a video the other day saying the Cystatin/egfr test is the better one to get. And the fast Googling I just did said it's more arcuate because it's not influenced by diet, exercise, ect.

 

[McLovin.]

protect those kidneys get on some astragalus root

 

[jasonsta]

My BUN and creatinine always seem to be creeping up over the last 4 years since I've been on TRT and cycling (I'm not huge by any means) and it concerned me. I just had a panel run and my numbers are wildly different depending on the test. I also take 5g creatine per day.

BUN 29 (6-24 lab range)
Creatinine 1.55 (.76-1.27)
egfr 57 (sub 59 is low)

Now w/cystatin C

Cystatin C .68 (.6-1) lower is better
egfr 122!!!!!!

It's mind blowing to me that one kidney function test that is used overwhelmingly by doctors shows my egfr just under normal and the cystatin C test shows my egfr thru the roof w/pristine kidney function. Have any of you seen such a huge difference in your own bloods?

I did the same tests and got exactly the same results.
that was a relief

 

[jankoch]

Still if you can , make them do a sonography.
Kidney is a pretty fucked up organ as lots of the times chronic problems doesnt cause much obvious symptoms.

 

[explodingHeart]

Creatinine is a trash tier lab marker

 

[jtmarlin]

Creatinine is a trash tier lab marker

The strange thing is that primary care doctors are basing their decisions off of these seemingly antiquated tests.

 

[jasonsta]

The strange thing is that primary care doctors are basing their decisions off of these seemingly antiquated tests.

no, if you tell them that you do sport, they say that then it's normal and they look at other values like gamma gt...

 

[MarkusLA]

no, if you tell them that you do sport, they say that then it's normal and they look at other values like gamma gt...

I think GGT is for liver not kidney.

 

[b6798045]

Measure also urine Albumin and Creatinine for assesing CKD.

eGFR Calculator

www.kidney.org

 

[Humble-Beast]

Now you know.. I've got to remind my doc constantly why I added Cystatin C, GGT, Apo-B to my labs, lol.
I knew you'd fuckin spaz at creatine, egfr, alt/ ast levels..
Did she bother to look at them before ordering an abdominal ultrasound?
Nope, lol

 

[jtmarlin]

I just had another round of kidney tests and my egfr was 53 on a 1.63 creatinine and my egfr was 105 on a cystatin c test. It's batsh*t insane to make medical decisions off of creatinine numbers.

 

[tomvet93]

I got the creatinine through this morning and the cystatin c this afternoon and although I knew it would highly likely be fine it's still quite worrying.

It didn't help that I stopped supplementing creatine a week before, avoided meat for 24hrs and didn't exercise for a few days before to try to make the creatinine as accurate as possible as last time I had 115

Kidneys are one of the last organs I would want to fail on me looks absolutely miserable

 

[jtmarlin]

I got the creatinine through this morning and the cystatin c this afternoon and although I knew it would highly likely be fine it's still quite worrying.

It didn't help that I stopped supplementing creatine a week before, avoided meat for 24hrs and didn't exercise for a few days before to try to make the creatinine as accurate as possible as last time I had 115

Kidneys are one of the last organs I would want to fail on me looks absolutely miserable

You are worrying for nothing you're totally fine given your cystatin c number. It's the true number, not your creatinine.

 

[tomvet93]

You are worrying for nothing you're totally fine given your cystatin c number. It's the true number, not your creatinine.

Sorry meant worrying waiting for cystatin. I didn't word it very well sorry.