[MotherBear]

Usually, once you have submitted your medical certificate and it's in the hands of INZ, you don't need to worry about the timing but on here it says......

A4.20 Medical and X-ray certificates: residence applications
See A4 (before 28/11/2005)

a) Applications for residence must include, at the time the application is lodged, a fully completed Medical and Chest X-Ray Certificate NZIS 1007 for every person included in the application.
Note: Pregnant women and children under 11 years of age are not required to have an X-ray examination.

b) All Medical and Chest X-Ray Certificates must have been issued less than three months before the date the application for residence is made. (The issue date of a Medical and Chest X-Ray Certificate is the date of the declaration by the examining physician concerning the overall findings of the medical examination.)

c) Visa and immigration officers may require a further Medical and Chest X-Ray Certificate as a basis for determining an application for residence, if they consider this is necessary to establish whether the applicant has an acceptable standard of health.