So long as you qualify for FMLA or OFLA (state medical leave law) and the employer is covered by having a sufficient number of employees, an employer must provide a full 12 weeks of medical leave for qualifying conditions. Such leave can be intermittent. A qualifying condition means a "serious medical condition," which can include a condition for which the employee receives "continuous treatment," which in turn means at least two doctor's visits. An employer is entitled to current medical information and as much notice as is practical, but if such medical information and notice is given, an employer may not deny intermittent medical leave merely because it exceeds some estimated number of days. Once the 12 weeks of leave per 12-month period is exhausted, an employer need not provide additional medical leave under FMLA or OFLA (with certain limited exceptions). Even then, an employer has an obligation to provide reasonable accommodation under disability discrimination law, which may include additional leave.

The above is not legal advice, but for general discussion only. Consult an experienced employment lawyer for specific advice or to determine your legal rights under your specific facts.