Creatinine/Urea nitrogen &#x7C; Serum or Plasma &#x7C; Chemistry - non-challenge
creatinine/urea nitrogen &#x7c; serum or plasma &#x7c; chemistry - non-challenge
Creatinine/Urea nitrogen &#x7C; Serum or Plasma &#x7C; Chemistry - non-challenge
creatinine/urea nitrogen &#x7c; serum or plasma &#x7c; chemistry - non-challenge