Should not be a big deal. Someone i know had to return to the clinic a week after interview date. Interview was conducted and visa approved but not issued pending final review of the medical test. Apparently there were some shots needed and they had to be spaced apart.
Eventually after receiving the complete shots, visa was issued.
Incomplete vaccination is the usual suspect in such scenario when person is asked to return after a week or two. Sometimes the spacing can even be longer but usually this does not affect the outcome of the interview. It does delay, however, any plans of immediate travel after interview.
Are you bringing suya back or not?? Okay, fine...Chin-Chin then........

Just to add.. for information purpose only....the medical test can be conducted and concluded in a single day. This is the usual case when most vaccinations are complete (and records available) prior to the clinic visit.