Cat · Felis catus · typical adult weight 2.50–7.00 kg
Phenol Red Thread Test is used in cat for Tear production measurement. Routes documented in cat: TOPICAL (ophthalmic). A typical adult cat weighs 2.50–7.00 kg. ExoticRx lists 1 cited dose rule for Phenol Red Thread Test in cat, drawn from published veterinary references. Verify against current literature before clinical use.
Trade names: Zone-Quick
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| TOPICAL (ophthalmic) | 0 1 thread per eye | PRN (diagnostic) | 15-second measurement | Tear production measurement | Moderate | Plumb's Veterinary Drug Handbook, 9th Ed |
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These ranges are per kg. Enter your cat's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
pH-sensitive dye thread placed in lower conjunctival fornix. Tears change thread color from yellow to red, measuring tear production in 15 seconds.
Less invasive than Schirmer tear test. Good for exotic species and cats. Normal values differ by species. Not a therapeutic agent.
Species-specific contraindications and adverse-reaction reports for cat may differ from canine / feline reference data — consult the primary citations listed with each rule.
Why a species-specific page? Phenol Red Thread Test pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in cat — the rules above are the citations specific to this species, not generic recommendations.
Sourced from published veterinary references; awaiting credentialed clinical reviewer. See our editorial process. Reference only — not veterinary advice.