A mass fragmentographic method of high accuracy for determination of serum urea is
described. A fixed amount of [15N 2] urea is added to a fixed amount of serum, then the urea …

A mass fragmentographic method for assay of serum uric acid was developed and used as a
reference method to evaluate the accuracy of different routine methods used in clinical …

A method for the automated determination of urea in plasma and urine, using urease and
alkaline phenol, proved to have the advantages of speed and precision when compared …

A method is described for the determination of urea in plasma and urine. The effects of
variations in the experimental conditions are examined and the results of recovery …

A rapid method for the determination of urea in blood and urine based upon the urea-p-
dimethylaminobenzaldehyde reaction is described. Results of determinations can be …

In this method for serum and urinary urea determination, the same reagent is used without
predilution of urine samples. The method is based on the pH increase resulting from the …

An improved procedure for the determination of urea in blood serum and urine is presented.
Blood serum is deproteinized with trichloroacetic acid and the resulting filtrate heated for 30 …

Abstract o-Phthaldialdehdye reagent was used in assaying urea with a miniature centrifugal
analyzer. Seventeen samples can be assayed kinetically in 2 min at a current cost of less …

We describe a new kinetic assay for determining urea in serum or urine with use of urease
(EC 3.5. 1.5) and leucine dehydrogenase (EC 1.4. 1.9). The latter enzyme is suitable for the …

A new instrument, the Beckman BUN Analyzer, has been produced for the estimation of urea
in microvolume (0-01 ml) of serum or plasma. It requires only a simple two-point calibration …