They do a chest X-ray for tuberculosis and blood test looking for things like HIV. Don't be worried, as sponsored spouses can not get denied PR for medical grounds. Even if they have a serious illness like HIV. It takes Kingston about 2-3 weeks to review the medical results. From my own experience, we got no tracker updates at all after the medical results until after they issued the visa and COPR. All the updates showed up that day. The trackers lag behind, so don't rely on them. We received a pre-arrival letter and then the passport request a few days later.
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