The FMLA permits an employer to require that you submit a timely, complete, and sufficient medical certification to support a request for FMLA leave to care for a covered family member with a serious health condition. If requested by your employer, your response is required to obtain or retain the benefit of FMLA protections. 29 U.S.C. §§ 2613, 2614(c)(3). Failure to provide a complete and sufficient medical certification may result in a denial of your FMLA request. 29 C.F.R. § 825.313. Your employer must give you at least 15 calendar days to return this form to your employer. 29 C.F.R. § 825.305.