Routine health checkup (annual / 6-monthly)
Annual check for adult pets, twice a year for seniors or those with chronic conditions. Not when sick, precisely when they look fine. The goal is to catch problems before they become visible.
During a visit, the vet usually checks: temperature, pulse, eyes, ears, teeth, mouth, skin, coat, abdominal palpation (feeling for lumps or organ enlargement), and heart-lung auscultation with a stethoscope. Plus a body condition score, underweight, ideal, or obese. Discussion about feeding, behaviour, BM/urine frequency, and what you have noticed recently.
Home examination is often more accurate for cats and dogs that stress at the clinic, vital signs are much more representative when the pet is not panicking. You can also show directly your cat's bed, food, or the corner it avoids.