An onsite flu shot clinic has two parts. The first is arranging for a healthcare provider to bring vaccinators and vaccine to your workplace. The second is deciding when employees should arrive.
The first part is usually handled directly with the vaccination provider. The second is where scheduling makes the biggest difference. Without a schedule, employees tend to arrive at the same time, creating a line at the beginning of the clinic while other periods remain underused. A simple appointment schedule spreads employees throughout the clinic and gives the provider a better idea of how many people to expect.
This guide explains how to plan the schedule, determine your clinic's capacity, collect information before employees arrive, handle walk-ins and no-shows, and keep the clinic moving on the day.
Start by contacting your vaccination provider several weeks before the clinic. Providers generally want at least four weeks' notice, and fall is a busy season for flu vaccinations, so booking early gives you more choice of dates and times rather than taking what is left.
When you contact the provider, ask about three things that will affect your schedule:
Your provider may also have specific requirements for the room, employee flow, observation area, or the number of people who can be vaccinated at one time. Get these requirements before building your appointment schedule. They are routine questions, and a provider who cannot answer them clearly is telling you something.
This is the number your entire schedule is built around, and it is the step most often skipped. Start with the information from your provider about how quickly the vaccination team can work. The actual rate varies with the number of vaccinators, the provider's process, the paperwork involved, and the needs of the employees.
For planning purposes, you might calculate your expected capacity like this:
Number of vaccinators × vaccinations per hour × number of clinic hours = approximate capacity
A single vaccinator typically handles about 20 employees an hour, with nearly all clinics falling somewhere between 15 and 30 depending on paperwork, employee questions and the provider's own process. Plan toward the lower end for the first hour while everyone finds their rhythm. Two vaccinators is not simply twice as fast, because they will share a check-in desk and a waiting area.
| Vaccinators | Typical per hour | Usual range | 3-hour clinic | 4-hour clinic | 6-hour clinic |
|---|---|---|---|---|---|
| 1 | 20 | 15-30 | 60 | 80 | 120 |
| 2 | 40 | 30-60 | 120 | 160 | 240 |
| 3 | 60 | 45-90 | 180 | 240 | 360 |
Clinic totals use the typical rate. These are planning estimates, not guaranteed capacity - ask your vaccination provider for the rate they recommend for your specific clinic.
If you have 400 employees, two vaccinators and a four-hour window, capacity is around 160. You would need to extend the clinic, add another session, increase the number of vaccinators, or accept that not everyone will be vaccinated during that session. It is much better to discover that while you are planning the clinic than at 11:00 AM on the day.
Some vaccination providers require employees to remain onsite for a period after vaccination. That time may not reduce the number of vaccinations the team can perform, but it does affect how much space you need, and it is the usual reason a clinic that is running to time still feels chaotic. Plan for three areas: check-in, vaccination, and post-vaccination observation.
Once you know your approximate capacity, turn it into manageable appointment windows. You generally do not need to create an individual appointment time for every employee.
For example, if your clinic can accommodate approximately six employees every 15 minutes, create a 15-minute appointment window with a capacity of six. Employees select:
10:00-10:15 AM — 6 available
rather than 10:00, 10:02, 10:04, 10:06, 10:08, 10:10.
Group appointment windows are easier for employees to understand and give the clinic some flexibility when someone arrives a few minutes late. Any scheduling system worth using should let you set the number of participants per time slot rather than assuming one - pickAtime does, and lets you stagger the windows so arrivals are spread rather than clustered.
Do not schedule to your theoretical maximum. If your provider estimates that the team can vaccinate eight people every 15 minutes, you might schedule six or seven. The additional capacity gives the clinic room for:
A schedule with a little breathing room is generally more useful than one that works perfectly only when nothing goes wrong.
The best clinic schedule is not necessarily the one that fits most conveniently into the facilities calendar. Clinics scheduled to suit the building rather than the workforce get poor turnout, which then gets blamed on employee apathy. Think about when your employees are actually available.
The period around lunch may work well, because employees are already taking a break. The last hour of the day is usually the weakest - people leave.
Consider scheduling around shift changes, so employees can attend without leaving their work areas understaffed and both the outgoing and incoming shift can be seen.
If employees work in several buildings, consider whether everyone can realistically get to one clinic location. A clinic in one building will not draw meaningfully from another. You may get better participation by offering clinics at different locations or on different days.
If employees normally work remotely, consider holding the clinic on a day when more employees are already scheduled to be onsite, rather than adding a reason to come in.
Try not to schedule the clinic during month-end or quarter-end close, major company meetings, busy seasonal periods, or important project deadlines. A clinic that competes with a deadline loses.
The check-in process can become the biggest bottleneck at a workplace clinic. If every employee arrives without completing required forms, the check-in desk becomes the queue. At a 200-person clinic, three minutes of paperwork each is ten hours of queueing.
Ask your vaccination provider what information employees must provide, and whether forms can be completed before the clinic. Depending on the provider and how the vaccination is being administered, employees may need to provide information such as:
If your scheduling system can collect required information during registration, employees can complete much of the process before they arrive, and check-in becomes confirming a name against a list.
Some of the information collected for a vaccination clinic may be health information. Before collecting it through a scheduling system, determine:
Collect only the information that is necessary for the clinic.
Even with a well-planned schedule, some employees will not arrive for their appointments and others will show up without one. Expect roughly one in ten booked employees not to appear, and expect people who never booked to turn up because a colleague mentioned it. Build a plan for both.
Send employees a confirmation when they book and a reminder before the clinic. A reminder the day before is particularly useful, because employees can still change their plans or cancel their appointment. A same-day reminder may also help. pickAtime sends both email and SMS reminders; for a workplace clinic the text message is usually the one that works, because it reaches people who are not at a desk.
If walk-ins are allowed, consider reserving some capacity rather than filling every appointment slot. For example, if the provider can handle six employees during a 15-minute window, you might schedule five and leave one place available. Booked employees keep their window, walk-ins are seen in the gaps, and the no-show rate quietly absorbs most of the difference.
The right amount of reserve capacity depends on your expected participation and your provider's process. The goal is to avoid two extremes:
Someone should be responsible for the overall flow of the clinic, and should not be one of the people administering vaccinations or checking employees in. That person can monitor:
If a particular period becomes crowded, the coordinator can direct employees to later availability. If later periods remain empty, the coordinator can tell the provider early - they may be able to leave sooner, and you may be paying for time you are not using. Being able to see registrations and attendance as they happen makes this much easier.
The physical layout can have almost as much impact on the clinic as the scheduling system. When possible, create a simple flow:
Check-in → Vaccination → Observation → Exit
Keep the areas clearly separated. Employees who have already been vaccinated should not have to move back through the check-in or vaccination area to reach the exit. Most clinic congestion is people who have been vaccinated standing where people waiting to be vaccinated need to be.
Before closing the event, review the booking and attendance information. Three numbers are particularly useful for planning next year's clinic.
How many people booked? This tells you the level of initial interest.
How many people actually attended? Comparing bookings with attendance tells you your no-show rate.
Which appointment windows filled first? This tells you when employees actually preferred to attend. You may discover that the lunch-period appointments filled immediately while late-afternoon appointments remained available.
Those three numbers turn next year's capacity planning from a guess into arithmetic. If you run clinics at several locations, keep the results by location - participation varies far more between buildings than between years.
pickAtime has provided online scheduling since 2000, including flu clinics, biometric screenings and other employee health and wellness events.
Instead of having employees line up when the clinic opens, employees can select an available appointment window in advance. Administrators can control the number of employees allowed in each time period, helping spread attendance throughout the clinic, and can see registrations as they happen. pickAtime also sends email and SMS reminders, which helps reduce missed appointments and makes it easier for employees to remember when to arrive.
For organizations that run several clinics or wellness events, the scheduling information provides a record of registrations and attendance that makes planning the next event easier. The flu shot scheduling overview covers how clinic scheduling works in practice, and pricing is published rather than quoted.
When you are ready to build the schedule rather than plan it, the step-by-step documentation lives in the event setup guide, which explains how to create the schedule, set capacity, collect registration information and send reminders. The management guide covers running the clinic on the day, and the event FAQs answer the questions organizers ask most often.
