ExoticRx · exoticrx.com/drugs/phenol-red-thread-test
Zone-Quick
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 references:All Cat (Domestic) drugsAll Dog (Domestic) drugs
Each ExoticRx dose rule is graded by the strength of its primary evidence — see the editorial process.
A dog/cat sample is shown here. Cited dosing for all 2 species — reptiles, birds, pocket pets, livestock, and equine — is free on the per-species pages above. Pro adds the weight-based calculator for every species.
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View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.