How to count sick days
When you work out the number of days that you’ve been sick, you need to count all the days in a row you’ve been sick, including days you don’t normally work such as weekends and bank holidays.
Less than seven days off sick
If you have been sick for more than four days in a row, but less than seven, you can self–certify your illness using a SC2 form available online from HMRC.
Many employers have their own self-certification forms. You do not need to see a Doctor.
More than seven days off sick