Severe disturbance of the patient's acid-base balance may cause interference with the Azostix test for blood urea. The strips gave underestimates in blood specimens from some of the severely acidotic patients tested, and slight overestimates in a few of the severely alkalotic ones.
References
1.
BoldA. M.MenziesI. S.WalkerG. An assessment of the Azostix strip test. J. clin. Path.23 (1970) 85.
2.
BravermanA. M.SaundersP. G.Bedside blood urea. Trial of a new reagent strip (Azostix). Clin. Trials J. 6 (1969) 181.
3.
BurrowsS.ChapmanG. Evaluation of rapid methods for the estimation of blood urea nitrogen. Am. J. clin. Path.50 (1968) 652.
4.
DagnallP.FackerellR.WestonP. Measurement of blood-glucose levels. Lancet1 (1968) 860.
5.
HallS. M.PrestonI. W.Acid-base status and Azostix. Brit. med. J.3 (1971) 434.
6.
HumbelR.IdouxI.RagenardS. Bestimmung des Blutharnstoffs mit einem neuen Schnelltest. Med. Lab. (Stuttgart)21 (1968) 269.
7.
JonesF. Private communication (1968).
8.
JordanL. E.AustinJ. B.Anomalies in the estimation of urea in biological fluids. J. med. Lab. Technol.25 (1968) 126.
9.
KeyserJ. W.WatersW. E.Measurement of blood-glucose and blood-urea. Lancet2 (1968) 50.
