The FMLA permits an employer to require that you submit a timely, complete, and sufficient medical certification to support a request for FMLA leave due to your own 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. 29 C.F.R. §825.305(b).