Three screens carry a Serengeti: a urine test that runs on a 6-month clock, a heart echo that starts at 12 months, and a retinal exam that starts at the same visit as the first echo. The urine side is the one that can kill inside 24 hours, so it gets the shortest interval and the clearest rules. Evidence for the breed is limited, because the breed is small and recently developed; the intervals below follow general feline practice and should be adjusted by your vet, not by a breed average.
The 6-month urine clock, and why it is 6
Baseline urinalysis at 12 months with specific gravity (USG) and sediment, then every 6 months for life. Six months is short enough to catch a crystal pattern before it becomes a stone and long enough that most owners will actually keep the appointment. If struvite or calcium oxalate crystals appear, the interval drops to 3 months until 3 clear samples in a row, and an X-ray at that point rules out stones that are dense enough to show. Urine pH is worth recording every time: a cat sitting at 7.5 or above with crystals has a different problem from one at 6.2. USG between 1.035 and 1.060 is a normal concentrated sample; a cat on dry food that cannot concentrate above 1.025 needs a kidney recheck in 4 weeks.
Blockage: the 6-hour rule
A male cat with a urethral plug can go from uncomfortable to critical in under a day. No urine for 6 hours, or repeated trips to the box with nothing produced, is an emergency, and 24 to 48 hours of total obstruction can be fatal. Watch for the cat licking the penis, crying in the box, or hiding; a hard, painful bladder the size of a walnut is the classic finding. After any blockage, the 6-month urine clock restarts at 1 month, then 3 months, then 6 months.
Heart: echo from 12 months
Hypertrophic cardiomyopathy (HCM) is the reason the calendar has a second track. Read the septum first: normal sits under 5.0 mm, a 5.0 to 5.9 mm wall buys a 6-month recheck, and 6.0 mm or more meets the usual definition. Then read the left atrium to aorta ratio (LA/Ao). The 1.5 line cuts the interval to 6 months, and at 1.7 the cardiology service takes over within a week. There is no validated breed DNA test for HCM, so echo is the screen. Echo at 12 months, then every 12 months to age 6, then every 6 to 12 months. Ask for wall thickness, LA/Ao and any systolic anterior motion on the report, and keep every report together: a wall that moves 4.4 to 5.2 mm across 3 years changes management even when each single scan reads normal.
Retina: annual exam, and what owners notice first
Progressive retinal atrophy (PRA) starts in the dark. A dilated fundic exam by a veterinarian at 12 months, then every 12 months, is the practical screen; a veterinary ophthalmologist adds an electroretinogram when the exam is ambiguous. Ask whether the DNA test used in Bengal lines applies to your cat's pedigree, since this breed descends from those lines, and test once if it does. Owners usually see the disease before the vet does: a cat that stops jumping onto furniture at night, or walks with a low head along a familiar hallway, is showing night blindness, not stubbornness. Night vision loss that appears over 4 to 8 weeks and then holds is the pattern to report; a sudden loss over 24 to 48 hours is a different emergency, usually blood pressure or retina detachment.
The calendar, with costs in 2 currencies
| Age | Urine | Echo | Eye exam | Cost USD | Cost CNY |
|---|---|---|---|---|---|
| 12 months | 1, USG and sediment | 1 | 1 | 395 | 2,844 |
| 18 months | 1 | 0 | 0 | 95 | 684 |
| 24 months | 1, plus X-ray if crystals | 1 | 1 | 470 | 3,384 |
| 3 to 6 years | 2 per year | 1 per year | 1 per year | 520 | 3,744 |
| 7 years and up | 3 per year, plus blood pressure | 2 per year | 1 per year | 760 | 5,472 |
The 3-year total for a cat with no findings sits near 1,800 dollars, about 12,960 CNY; a cat that forms crystals twice in 12 months spends 400 to 700 dollars more per year on diet and extra visits.
Four signals to log at home
Weekly, 5 minutes: (1) litter box count, trips per 24 hours; more than 4 trips with small clumps is a flag, and 0 clumps in 12 hours is an emergency. (2) Sleeping respiratory rate, counted over 30 seconds and doubled; 30 breaths a minute or more on 2 days earns an echo. (3) Any pink or red tinge in urine, or grit on the box floor. (4) Night behaviour: bumping furniture, hesitating at the stairs, a wider stance in dim light. Add water intake in millilitres per day if you can measure it; a jump from 200 to 350 ml in a week is worth reporting.
When it cannot wait
| Window | What you see | Urine in 24 h | Call within |
|---|---|---|---|
| 0 to 2 hours | crying in the box, hard bladder, vomiting | 0 | 0, drive now |
| 2 to 6 hours | straining with drops only, pink urine | under 30 ml | 6 hours |
| 6 to 12 hours | open-mouth breathing, resting rate 40 or more | normal | 12 hours |
| 12 to 24 hours | sudden blindness, bumping walls | normal | 24 hours |
| 24 to 72 hours | crystals on the box floor, no other sign | normal | 72 hours |
Prescription urinary diets, potassium binders, diuretics and blood pressure drugs are all by veterinary prescription and are chosen by category after bloodwork; no over-the-counter supplement replaces the 6-month urine test. Never restrict water to reduce urination in a cat with crystals.
Five steps for this week
1) Put a 6-month reminder in the calendar from today. 2) Count litter clumps for 3 days and note the number. 3) Measure the sleeping respiratory rate twice this week. 4) Write down 3 words that describe the cat's night behaviour, so a change is visible later. 5) Book the 12-month visit as 1 combined appointment: urine, echo and eye exam on the same day saves 1 trip. For a breed screened mainly on skin and teeth, compare the Turkish Van plan; for a breed with a kidney and eye focus, the Tonkinese plan. The breed quiz lists which checks each breed actually needs.
Terms mentioned in this article
Frequently asked
How often should a Serengeti's urine be tested?
A baseline at 12 months with specific gravity and sediment, then every 6 months for life. If crystals appear, the interval drops to 3 months until 3 clean samples in a row, with an X-ray to rule out stones. After any urethral blockage, restart at 1 month, then 3 months, then 6 months.
What are the signs of a blocked urethra?
No urine for 6 hours, repeated trips to the litter box with nothing produced, crying in the box, licking the penis, vomiting, or a hard painful bladder about the size of a walnut. This is an emergency at once, because 24 to 48 hours of total obstruction can be fatal.
Can PRA in this breed be tested by DNA?
Ask whether the DNA test used in Bengal lines applies to your cat's pedigree, and test once if it does. Either way, a dilated fundic exam at 12 months and every 12 months after that is the practical screen, with an electroretinogram if the exam result is unclear.