Siberian Forest Cats need 4 screens, not 1: an echocardiogram for hypertrophic cardiomyopathy (HCM), a PKD1 DNA swab plus a kidney ultrasound for polycystic kidney disease (PKD), a hip radiograph at 24 months, and a weight check 4 times a year after neutering. A first-year baseline runs 500 to 900 dollars across 2 visits; after that, budget 220 to 450 dollars a year, most of it for the echo. Start at 12 months rather than 6, because hip scoring needs closed growth plates and a kitten chest reads poorly on ultrasound.
What the 4 screens are looking for
Each test answers a different question. The echo measures left ventricular wall thickness in diastole: under 5.0 mm is normal for most cats, 5.0 to 5.9 mm is a grey zone that earns a recheck in 6 months, and 6.0 mm or more meets the usual definition of HCM. The same report carries the left atrium to aorta ratio (LA/Ao): 1.5 and below is fine, 1.6 to 1.7 is equivocal, and above 1.7 means the atrium is dilating. The kidney ultrasound looks for cortical cysts of 2 mm or more; 3 or more in a cat under 5 years is the pattern that matters. The hip film is read on the Norberg angle, where 105 degrees is a common cut-off. The weight check is a body condition score (BCS) out of 9, with 5 ideal and 7 the point where portions get recalculated.
The 12 month baseline in 1 morning
Book a 60 minute slot and ask for 3 things: the echo, the PKD1 cheek swab, and a urinalysis with urine specific gravity plus a urine protein to creatinine ratio (UPC). The echo takes 20 to 30 minutes, needs no sedation in most cats, and clips 2 patches of fur. The swab takes 1 minute at the front desk and results come back in 10 to 21 days. The urinalysis is the kidney reference you will compare against for years; it costs 40 to 90 dollars, and the UPC adds 35 to 70 dollars. Fast the cat for 4 hours if sedation is planned, bring every previous report, and ask the sonographer to type 3 values on the discharge sheet: wall thickness in mm, LA/Ao, and whether systolic anterior motion (SAM) is present.
The calendar, year by year
| Age | Echo | Kidney ultrasound | Hip film | Next step (months) | Typical cost USD |
|---|---|---|---|---|---|
| 12 months | 1 | 1 | 0 | 12 | 480 |
| 24 months | 1 | 1 | 1 | 12 | 760 |
| 3 to 5 years | 1 per year | 1 every 24 months | 0 | 12 | 300 |
| 6 to 8 years | 1 per year | 1 every 24 months | 0 | 12 | 330 |
| 9 years and up | 1 per year | 1 every 12 months | 0 | 12 | 360 |
Any abnormal value pulls the next visit forward to 6 months. Book the next echo before leaving the building, dated 11 months out, so 1 reschedule cannot stretch it.
Kidneys: why the swab does not replace the scan
PKD in this breed is autosomal dominant and tied to 1 well-described variant in the PKD1 gene, so 1 copy inherited from either parent is enough to produce cysts. The swab costs 60 to 120 dollars and is close to conclusive when positive. A negative swab from tested lines is strong information but no licence to skip the scan once: simple cysts exist, and the scan also records kidney length and cortical thickness as a later reference. Cysts usually appear between 6 and 24 months and can grow 1 to 2 mm a year. A practical sequence is a scan at 12 months, a second at 24, a third at 36; 3 clear scans 12 months apart in a DNA-negative cat end the screening. A positive cat moves to ultrasound every 12 months plus blood pressure and UPC every 6 to 12 months, because the number that eventually matters is kidney function, not cyst count.
Hips: 1 film at 24 months, 2 numbers to keep
Hip dysplasia here is usually mild and shows as stiffness rather than a limp, so the film is worth taking before the cat is lame. It is taken at 24 months or later, under sedation, in 2 views, extended and frog-leg. Cost runs 150 to 300 dollars. Ask for the Norberg angle on each side, and a distraction index if the clinic offers it. A cat scoring under 105 degrees on both sides, or above 0.5 on distraction, gets 3 changes the same week: no jumps from surfaces higher than 60 cm, a step or ramp to the litter box, and a joint supplement discussed with the vet. Prescription nonsteroidal (NSAID) pain relief is a vet decision, never a borrowed tablet: 1 human NSAID or 1 paracetamol tablet can be fatal to a cat, as the toxicity checker explains.
After the neuter: 4 numbers that decide the weight
Energy needs fall 20 to 30 percent in the 8 weeks after neutering while appetite often rises. A 5 kg cat that held 240 kcal a day before surgery usually holds 180 to 200 kcal after it, and feeding the old amount adds roughly 40 to 60 g of fat a month. Weigh monthly on the same scale at the same time of day, and log it in a weight trend chart. A gain of 10 percent across 12 months is the line where portions come down 10 percent and play goes to 2 sessions of 10 minutes a day. If the cat is already overweight, the target is 1 to 2 percent of body weight per week, not more, because rapid loss can trigger hepatic lipidosis.
4 signals you can check at home
Sleeping respiratory rate comes first: count chest movements for 30 seconds in deep sleep, twice a week, and treat 30 breaths per minute as the ceiling. Then water intake above 45 ml per kg per day, which for a 5 kg cat is over 225 ml. Then refusing a jump it managed 4 weeks ago. Then a 10 percent weight gain across 12 months on the same scale. Any 1 of the 4 is a reason to book now, not at the annual slot.
Call within these hours
| What you see | Call within | Why it cannot wait |
|---|---|---|
| Open-mouth breathing at rest | 0 to 1 hour | fluid in the lungs or a failing heart |
| Back legs dragging, cold paw pads | 0 hours, emergency | a clot in the aorta, painful and fast |
| Straining in the litter box with no urine | 4 to 6 hours | blockage turns fatal within 24 to 48 hours |
| No food for 24 hours plus hiding | 24 hours | fatty liver risk climbs after 48 to 72 hours |
| 3 sleep breathing readings of 30 or more in 1 week | 24 to 48 hours | early heart failure, still treatable |
5 steps for this month
- Book the 12 month visit with echo, PKD1 swab and urinalysis in 1 slot, 480 to 700 dollars.
- Start the sleep log tonight: 30 seconds, twice a week, ceiling 30.
- Weigh on the same scale and write it down, so 10 percent means something later.
- Get wall thickness, LA/Ao and the hip score in writing, all in 1 folder.
- Book the 24 month film now; it is the step most owners drop.
Screening diagnoses nothing on its own: HCM needs an echo read by a vet, PKD needs imaging, hips need a film. What the calendar buys is a baseline, so a 1.5 mm change in wall thickness at age 4 is a finding, not a surprise.
Terms mentioned in this article
Frequently asked
At what age should a Siberian's first heart echo happen?
At 12 months, then once a year through age 5, because HCM in this breed most often appears between 2 and 7 years and a single clean scan at 12 months proves very little. After 5 clean yearly echoes the interval can stretch to every 24 months, as long as the cat stays symptom free and the sleeping respiratory rate stays under 30 breaths per minute.
Does a negative PKD1 swab mean the kidneys are clear?
It means the inherited form is very unlikely, since PKD here follows 1 dominant variant, but it is not a licence to skip imaging entirely. Simple cysts unrelated to PKD exist, and a baseline ultrasound also records kidney length and cortical thickness. Most vets still do 1 scan at 12 months and 1 at 24 months before retiring the kidneys from the schedule.
How much does the screening year cost in total?
Budget 480 to 700 dollars for the 12 month visit, which bundles the echo at 220 to 450 dollars, the PKD1 swab at 60 to 120 dollars and a urinalysis with UPC at 75 to 160 dollars. The 24 month year adds a sedated hip film at 150 to 300 dollars, so plan on roughly 760 dollars for that one, then 300 to 360 dollars a year after that.