Four checks carry a Cornish Rex through a normal life span: an echocardiogram every 12 months from age 1, a kneecap exam at every visit plus X-rays at 24 months, a coat log reviewed every 8 weeks, and 1 baseline urine and blood panel at 12 months. The calendar matters more than any single test. The problems that slip through: a heart wall that thickens quietly between visits, a patella that pops out on a jump and stays out, and a bald patch that never closes.
The 4-item screen, with ages and costs
| Check | First at | Repeat | Cost (USD) | What it catches |
|---|---|---|---|---|
| Echocardiogram | 12 months | every 12 months | 250 to 500 | wall thickness, LA/Ao, SAM |
| Patella exam | every visit | every 6 months | 0 to 40 | grade 1 to 4 luxation |
| Hind-limb X-ray | 24 months | every 24 months | 120 to 260 | trochlear depth, bone angle |
| Urine plus blood | 12 months | every 12 months | 165 to 330 | USG, kidney values, T4 |
Book the echo and the blood panel into 1 visit; 2 sedations in a month is 1 too many. The hind-limb X-ray is the item owners drop, and it decides whether a grade 1 knee is rechecked at 12 months or 24.
Heart: why the first echo lands at 12 months
Four numbers belong on the discharge sheet: maximal left ventricular wall thickness in diastole, the left atrium to aorta ratio (LA/Ao), any systolic anterior motion of the mitral valve (SAM), and the outflow gradient in mmHg. Under 5 mm is normal for most cats; 5 to 5.9 mm is a grey zone that earns a recheck in 6 months; 6 mm or more meets the usual echocardiographic definition of hypertrophic cardiomyopathy (HCM). An LA/Ao above 1.7 means the atrium is dilating and the plan changes inside 7 days. A resting gradient above 30 mmHg changes how anesthesia is built for a dental. A DNA panel covering MyBPC3 variants costs 90 to 180 dollars, but 1 negative swab does not cancel 1 echo, because non-genetic causes produce the same thick wall. Repeat yearly to age 5, then hold the interval; the rhythm matches the Maine Coon heart protocol.
Knees: grades, films, and the 24-month decision
Patellar luxation is graded 1 to 4. Grade 1 luxates under hand pressure and springs back; grade 2 comes out on its own and returns; grade 3 sits out most of the time; grade 4 is fixed out and cannot be reduced. The grade goes in the record at every visit from the first kitten exam, because a grade 1 at 5 months can read as a grade 3 at 2 years. Films mean 2 views per hind leg, a ventrodorsal and a lateral, and they answer 3 things hands cannot: trochlear depth, femoral angle, tibial rotation. Surgery, usually a groove deepening plus tibial tuberosity transposition, runs 1,200 to 2,800 dollars per knee and is the usual recommendation for grade 2 or 3 with repeated lameness. Grade 1 with no lameness is managed with weight control and a 12 month recheck; on a 3 kg cat, 500 g of extra weight is 17 percent more load on a joint built for less, which is why the weight trend chart belongs here.
Coat: measure the patch, do not watch it
A bare flank or neck comes and goes; waiting is where owners lose months. Photograph the patch beside a ruler every 2 weeks and give it 12 weeks. Smooth skin with fine hair at the edges by week 8 is a shed cycle. Still bare at 12 weeks, or scaly, crusted, or itchy, and the list is short: skin scrape plus ringworm PCR at 40 to 150 dollars, then a T4 and free T4 if the loss is symmetrical on both flanks. Loss that repeats in the same 6 to 10 week window each year is usually follicular and needs warmth, not medication.
Cold stress and burns: 3 surfaces to test by hand
The coat that makes this breed recognizable removes most of the insulation, so the cat loses heat fast and sits against anything warm. A room at 20 to 24 C is comfortable; below 18 C the cat curls, shivers, or camps on a heat source. Radiator faces run 60 to 80 C and a hot water bottle holds 60 to 70 C, and a thin-coated cat will lie against either for 20 minutes and take a full-thickness burn on the belly or a paw pad. Test any heated bed with the back of your hand for 10 seconds; if you cannot keep it there, it is too hot. For a fresh burn, 20 minutes of cool running water, no ice, no ointment, then a vet visit within 2 hours for anything over 2 cm or anything on a pad. A rectal temperature below 37 C in a quiet cat that feels cool is a same-hour call.
4 home signals, logged weekly
- Sleeping respiratory rate: count for 30 seconds, twice a week, ceiling 30 breaths per minute.
- Jump refusal: 3 refusals of a 40 cm surface in 1 week means the knees get checked.
- Coat patch: bare at 12 weeks, or wider than 3 cm, goes on the list.
- Heat seeking: shivering or pressing against a radiator in a 20 C room.
The hour-level call table
| Signal | Trigger value | Call within | Next step |
|---|---|---|---|
| Sleeping respiratory rate | 30 or more, 3 readings in a row | 24 hours | echo within 7 days |
| Sleeping respiratory rate | above 40, once | 1 hour | emergency room |
| Open-mouth breathing at rest | any | 0 to 1 hour | oxygen, emergency room |
| Hind legs dragging, pads cold | any | 0 to 2 hours | clot workup |
| Sudden non-weight-bearing | 1 leg, after a jump | 12 hours | X-ray same day |
| Rectal temperature | below 37 C | 1 hour | warm slowly, then clinic |
| Burn blister | over 2 cm, or on a pad | 2 hours | wound care, pain relief |
| Bald patch | crusted, itchy, 12 weeks bare | 72 hours | scrape, ringworm PCR |
Booking rules that keep the loop closed
Set the next echo 11 months out, not 12, so 1 reschedule does not become 18. Fast 4 to 6 hours if sedation is planned, bring the last 2 reports, and ask for the same operator; a 0.5 to 1 mm difference between operators is the same size as the change you are watching. Radiator guards and a covered pad at 30 to 35 C cost under 60 dollars and remove most burn risk in the household hazard list. If a heart drug is ever prescribed it will be a beta-blocker or calcium-channel blocker class, by veterinary prescription only.
5 steps for the next 30 days
- Book the 12 month echo and blood panel as 1 appointment, 415 to 830 dollars together.
- Start the 30 second sleep count tonight, twice a week, in 1 note.
- Weigh the cat on the same scale on the 1st of each month.
- Photograph both flanks with a ruler in frame, then repeat every 2 weeks.
- Fit a radiator guard and a covered heat pad before the cold season.
None of these checks diagnoses anything by itself. HCM and patellar luxation are confirmed by a veterinarian with ultrasound and a hand on the joint. The calendar exists to make the finding arrive while it is still cheap to act on.
Terms mentioned in this article
Frequently asked
How often does a Cornish Rex need an echocardiogram?
Every 12 months from age 1 through age 5, then the same interval unless the cardiologist sets a shorter one. A single clean scan at 12 months is a baseline, not a clearance, because the wall can read normal and cross 5.9 mm two or three years later.
Is a bald patch on the flank always a sign of illness?
No. Many cats shed in a cycle and regrow within 8 to 12 weeks. Photograph the patch with a ruler every 2 weeks; if it is still bare at 12 weeks, or the skin is scaly or itchy, ask for a skin scrape, a ringworm PCR, and a thyroid panel.
How do I keep a thin-coated cat warm without risking a burn?
Hold the room at 20 to 24 C, use a covered heat pad at 30 to 35 C, and test every heated surface with the back of your hand for 10 seconds. Radiators at 60 to 80 C and hot water bottles at 60 to 70 C will burn a cat that lies against them for 20 minutes.