The phrase "complete checkup" means a thorough examination or assessment of someone or something to make sure everything is in good condition or working properly.
Sentences with «complete checkup»
A baby is given his / her first complete checkup around 3 days (72 hours) after the birth. (newkidscenter.com)
She wasn't able to complete the checkup so she waived the fee. (windyhillvet.com)
I do know not to ALWAYS trust the doctors, but he had just had a complete checkup and was healthy with no ear infections. (easybabylife.com)