Cat · Felis catus · typical adult weight 2.50–7.00 kg
Phenol Red Thread Test is used in cats for Tear production measurement. Routes documented in cats: TOPICAL (ophthalmic). A typical adult cat weighs 2.50–7.00 kg. ExoticRx lists 1 cited dose rule for Phenol Red Thread Test in cats, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Zone-Quick
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| TOPICAL (ophthalmic) | Normal cat: >15mm wetting | PRN (diagnostic) | 15-second measurement | Tear production measurement | Moderate | Brown, M.H., Brightman, A., Butine, M., & Moore, T. (1997) The phenol red thread tear test in healthy cats. Veterinary & Comparative Ophthalmology, 7, 249-252. — Verified against Veterinary Ophthalmology (Gelatt), 6th Ed, p.628 (2026-08-01). |
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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 cats may differ from canine / feline reference data — consult the primary citations listed with each rule.
Phenol Red Thread Test dose range in cats, with cited source references: TOPICAL (ophthalmic) Normal cat: >15mm wetting PRN (diagnostic). Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Phenol Red Thread Test in cats: TOPICAL (ophthalmic).
Cited course lengths for Phenol Red Thread Test in cats include: 15-second measurement. Duration depends on the indication — match it to the specific dose rule in the table above.
Phenol Red Thread Test is indicated in cats for: Tear production measurement.
These are general warnings for Phenol Red Thread Test across species; consult the cat dosing table above for species-specific guidance. Less invasive than Schirmer tear test. Good for exotic species and cats. Normal values differ by species. Not a therapeutic agent.
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 cats — 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.