Other words for "routine":
standard, regular, customary, accustomed, normal, usual, ordinary, established, natural, unexceptional, typical. everyday, common, commonplace, conventional, day-to-day, habitual, wonted, familiar.
So no - it's very, very unlikely you're dying of cancer or anything else.
It's a routine test and they want to talk to you about routine results - and while it's certainly possible to fly off into any number of imagined fears and worries, the surest way of addressing those is... make the appointment.
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Giraffe: a ruminant with a view.