A 53-year-old female asked:
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Does a low phoshorus level and low complement C3 but normal bun and creatin level mean kidney failure?

1 doctor answer
Dr. Reid Blackwelder
36 years experience in Family Medicine
No: Kidney failure is defined by changes in bun/cr and more correctly GFR (glomerular filtration rate) over time. A normal BUN and cr is reassuring. Usually the phosphorus is high with kidney failure. A low complement (c3) level relates to the immune system and a possible deficiency there.
Answered on Apr 1, 2019
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