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Urea Reduction Ratio

Source Blood
Mnemonic UREAPD2
Specimen Requirements 1 x 3 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections
Specimen Handling
Additional Information A URR value of 65% indicates adequate hemodialysis and is similar to a Kt/V value of 1.2.

UREAPD2 includes a post-dialysis urea test (UREA2) and a URR calculation that requires a pre-dialysis urea result.  The pre-dialysis specimen must be collected within 12 hours prior to the post-dialysis specimen.
Testing Location
Testing Frequency Daily
Alternate Name(s) URR, Urea, Post Dialysis
Reference Interval