Project Management Institute (PMI) is the global standard for Project Management certification. So if you are thinking of pursuing certification, you will want to familiarize yourself with their site and requirements. Several certifications are available:
To apply for the PMP, you need to meet the following eligibility requirements:
For further details, view the PMP Handbook:    PMP Handbook
If you do not meet PMP eligibility requirements, you may want to look at the Certified Associate in Project Management (CAPM)® certification.
Visit PMI’s website for the most up to date information on certification requirements.   http://www.pmi.org/Certification.aspx
Once you become certified, you will need to maintain certification status. As part of the Continuing Certification Requirements program, you will need to earn 60 PDUs per three-year cycle to maintain your credential.
|  Credential||No. of PDUs required for each 3-year cycle|
|  PMP||  60|
|  PgMP||  60|
|  PMI-SP||  30 PDUs in specialized area of project scheduling|
|  PMI-RMP        ||  30 PDUs in specialized area of project risk management        |
|  CAPM||  No PDUs. Re-exam at end of cycle|
There are a variety of ways to meet the continuing education requirements, and PMI has 6 categories for PDUs.
To learn more about the program, review the PMP Handbook. It explains how to earn and claim PDUs and how to renew your certification.    PMP Handbook