The short answer for a Musk turtle
A healthy adult Musk turtle does well with a routine reptile vet visit about once a year. Book the first appointment soon after the turtle comes home, even when everything looks fine, because that visit sets the baseline weight, shell firmness, beak shape and breathing pattern that later visits are judged against. A growing youngster, an older turtle, or one recovering from a recent problem may be asked back more often, and that is the vet following the individual animal rather than a fixed rule for the species.
Musk turtles are easy to underestimate. They are small, quiet, bottom-walking turtles that rarely bask in the open for long, so the dramatic clues owners notice in larger species often never appear.
What the vet is actually checking on this species
The vet will weigh the turtle and compare that figure with previous visits, because gradual weight loss in a Musk turtle is often the first measurable sign that something has shifted. The shell and the flat underside are felt for soft or uneven areas, the beak is checked for overgrowth that could interfere with feeding, and the eyes and nostrils are examined for swelling or discharge.
Expect questions that are very specific to a mostly aquatic turtle. How warm is the water, how is it filtered, how often is it changed, what does the turtle actually eat, and does it ever haul out to dry off? Bringing a fresh sample of tank water in a clean container lets the vet connect what is found on the turtle with the water it lives in, which matters far more for this species than for a land tortoise.
Between visits, watch the water walker
At home, your weekly job is noticing pattern changes. A Musk turtle that stops patrolling the bottom, sits at the surface for unusually long stretches, refuses favourite foods for several feeds in a row, or develops white patches on the shell deserves a call rather than a wait for the next yearly slot. Cloudy or closed eyes, wheezy breathing and a lopsided swimming posture are reasons to be seen promptly, not at the routine visit.
Keep handling brief when you check the shell. Musk turtles can release a musky smell when stressed and many individuals stay shy for life, so calm, short checks near the tank give you the information without turning every inspection into a struggle the turtle remembers.
Making the trip easier on a shy turtle
Transport the turtle in a secure, ventilated container lined with a damp towel, kept at a comfortable room warmth rather than chilled or heated. Never carry this species in a bucket of tank water, which sloshes, cools quickly and can be dangerous on the journey. Photographs of the aquarium, plus a short list of foods offered and refused in recent weeks, answer most of the vet's husbandry questions accurately.
Write down anything odd the week before the appointment, even if it resolved. A turtle that skipped two meals and then ate normally again is useful information about appetite trends, and it is exactly the sort of detail that evaporates from memory in the consulting room.
Keeping the record straight year to year
Because a Musk turtle can live for decades, its file will outlast your memory of any single setup, food change or house move. Recording each weight, water note and vet finding in one place turns the yearly visit into a comparison instead of a fresh start. That continuity is what makes a routine checkup genuinely useful for a species that shows so little on the surface. When those visit notes, weights and water details sit together in a KinsLe Pet Passport, the next vet can see your Musk turtle's whole story at a glance.