Oil and gas giant Chevron is under fire for asking prospective employees if they have ever had a miscarriage or an abortion.
The medical form, titled Medical History and Physical Examination, also includes questions such as whether the applicant has ever been pregnant, had a stillborn baby or had a procedure for sterilisation.
Chevron says the questions are explicitly voluntary and lawful, but the Maritime Union says the gas company is out of line.
The form also asks questions about the applicant's general health, exercise regime and diet.
But the union's Matthew Elliott says part F, labelled "reproductive outcomes", goes too far.
"I find that it's incredible that any employer believes that they need to know reproductive systems and history of any employee, and particularly the partner or the spouse of an applicant has to disclose that information as well," he said.
"Date of birth or termination of a pregnancy, birth defects, miscarriage, stillborn or a medical abortion - all those questions are not relevant to employment position that I can pick.
"The fact that people have to relive a traumatic experience in their lives for an employment position is horrific."