FMLA definition of a "serious health condition"

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"Serious health condition" means an illness, injury, impairment, or physical or mental condition that involves:

• any period of incapacity or treatment connected with inpatient care (i.e., an overnight stay) in a hospital, hospice, or residential medical care facility; or
• a period of incapacity requiring absence of more than three calendar days from work, school, or other regular daily activities that also involves continuing treatment by (or under the supervision of) a health care provider; or
• any period of incapacity due to pregnancy, or for prenatal care; or
• any period of incapacity (or treatment therefore) due to a chronic serious health condition (e.g., asthma, diabetes, epilepsy, etc.); or
• a period of incapacity that is permanent or long-term due to a condition for which treatment may not be effective (e.g., Alzheimer's, stroke, terminal diseases, etc.); or,
• any absences to receive multiple treatments (including any period of recovery therefrom) by, or on referral by, a health care provider for a condition that likely would result in incapacity of more than three consecutive days if left untreated (e.g., chemotherapy, physical therapy, dialysis, etc.). 

--http://www.dol.gov/whd/regs/compliance/1421.htm#2f