There are many different professional bodies that ask for IELTS score for registration in the industry. These professions can vary from teaching, medical, law or engineering to name a few.
If you are a working professional you have two options for IELTS, with the IELTS General Training and the IELTS Academic tests. You can check with the organisation directly which test is needed.
Some bodies ask for the IELTS General Training test, some require the IELTS Academic test, while there are some that accept both. The IELTS General Training test includes tasks which are related to social and workplace settings, so it is accepted by many vocational training centres or professional organisations.
Check the English language requirements of different recognising organisations before you book your IELTS test.