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VETSCAN UA USER’S MANUAL
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Appendix D:
Interfering.Substances
The table below should not be considered exhaustive, but a guide for interpretation of results.
As with all chemical reactions, temperature of the sample, strips or ambient air is important
for accurate results and all UA strip tests should be performed at room temperature with room
temperature (59-77 °F, 15-25 °C) reagents and samples.
Substance
Parameter(s) Affected
Effect
High glucose
LEU
Decreased LEU
Naphthyl ethylenediamine
hydrochloride
BIL, URO
Increased BIL
Increased URO
High specific gravity
LEU, KET, GLU, BLD, CR, PRO, MA
Decreased LEU
Increased KET
Decreased GLU
Decreased BLD
Increased CR
Increased PRO
Increased MA
Cephalexin, Cephalothin,
tetracycline
LEU
Decreased LEU
Low pH
KET, LEU, SG
Increased KET
Increased SG
Decreased LEU
High pH
PRO, CR, LEU, SG
Increased PRO
Increased CR
Increased LEU
Decreased SG
Red or darkly colored urine
KET, URO, BLD
False positive KET
False positive URO
Decreased BLD
Vitamin C (Ascorbic acid)
NIT, BIL, BLD, GLU
Decreased NIT
Decreased BIL
Decreased BLD
Decreased GLU
Hypochlorite
GLU, BLD
Increases GLU
Increased BLD
Peroxide
GLU
Increases GLU
High protein
SG
Increased SG
Reducing agents
ASC
Increased ASC
High CR
MA
Increased with very high CR
High Hemoglobin
MA, PRO
Increased with very high
Hemoglobin
High Mg Concentration
Ca
Increased Ca
Microbial peroxidase
BLD
Increased BLD