Appendix D: Interfering Substances - Zoetis VetScan UA User Manual

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
High glucose
Naphthyl ethylenediamine
hydrochloride
High specific gravity
Cephalexin, Cephalothin,
tetracycline
Low pH
High pH
Red or darkly colored urine
Vitamin C (Ascorbic acid)
Hypochlorite
Peroxide
High protein
Reducing agents
High CR
High Hemoglobin
High Mg Concentration
Microbial peroxidase
Parameter(s) Affected
LEU
BIL, URO
LEU, KET, GLU, BLD, CR, PRO, MA
LEU
KET, LEU, SG
PRO, CR, LEU, SG
KET, URO, BLD
NIT, BIL, BLD, GLU
GLU, BLD
GLU
SG
ASC
MA
MA, PRO
Ca
BLD
Effect
Decreased LEU
Increased BIL
Increased URO
Decreased LEU
Increased KET
Decreased GLU
Decreased BLD
Increased CR
Increased PRO
Increased MA
Decreased LEU
Increased KET
Increased SG
Decreased LEU
Increased PRO
Increased CR
Increased LEU
Decreased SG
False positive KET
False positive URO
Decreased BLD
Decreased NIT
Decreased BIL
Decreased BLD
Decreased GLU
Increases GLU
Increased BLD
Increases GLU
Increased SG
Increased ASC
Increased with very high CR
Increased with very high
Hemoglobin
Increased Ca
Increased BLD
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