Quick answer: For InBody scan preparation, get your facility's instructions before booking a time. InBody USA advises keeping your usual fluid intake the day before, waiting at least three hours after a meal, and testing after you have recovered from exercise. Wear light clothing, remove your shoes and socks, and record the conditions for your next visit.
Your gym offers a scan at 6 p.m., exactly when your lifting session ends. Before you book that slot, ask whether you can come in on a rested day. Matching the conditions of your second scan starts with a few choices you make before the first.
What should you do before an InBody scan?
Download the one-page InBody appointment checklist (PDF). Print it for your gym bag or fill in the visit details on your phone. There is space for the machine model, the time since your last meal and workout, and your next appointment.
Start with the instructions from the facility doing your test. A gym appointment on a standing analyzer and a test ordered by a clinician can have different requirements. Ask which model they use, what their meal and exercise windows are, and how much time to leave for check-in.
| When | What to do |
|---|---|
| When booking | Choose a time you can repeat. If you have a pacemaker or another implanted electronic medical device, tell the facility before you book. InBody manuals warn against testing with an implanted electronic device. |
| The day before | Maintain your usual fluid intake. Plan for the scan to take place when you have recovered from exercise. |
| Before leaving | Check the facility's meal instructions. Wear light clothes, leave heavy accessories behind and skip lotion on your hands and feet. |
| On arrival | Use the restroom, remove shoes and socks, and let the operator guide you through the hand and foot positions. |
| Before going home | Save the result sheet and write down the date, time, model and anything unusual about that visit. |
Sources for timing, contact and device restrictions are InBody USA's test instructions and the manufacturer's device manual.
Can you eat, drink or work out before the test?
Food. InBody USA asks people to wait at least three hours after their last meal. For example, a 10 a.m. scan after a 6:45 a.m. breakfast leaves three hours and fifteen minutes. If meal timing affects medication or a medical condition, get instructions from your clinician and the testing facility before changing your routine.
Water. Keep your normal fluid routine the day before. InBody USA advises hydrating one hour before testing. If you follow a prescribed fluid plan, follow that plan and ask the facility how to document it. Deliberately dehydrating yourself or drinking an unusual amount would make the visit harder to compare with your next one.
Training. InBody USA recommends testing once fully recovered from exercise and describes a one-to-three-day recovery window. Ask what the gym requires for your session. If you have already finished a hard workout, tell the operator before stepping on. Scheduling a time you can repeat is easier than trying to interpret a tired, sweaty baseline later.
What happens when you step onto the machine?
For a typical standing model, your bare feet contact the platform and your hands contact the grips. Follow the operator's directions for positioning, hold your arms where instructed and stand still until the test finishes. If you need assistance with balance or the grips, ask the facility about an appropriate setup in advance.
InBody USA recommends standing quietly upright for five to ten minutes before testing. If you have just come in from very hot or cold conditions, the manufacturer also advises allowing time for your temperature to settle. Ask the operator where you should wait.
The device uses bioelectrical impedance to estimate body composition. Fluid distribution can influence that estimate. If a follow-up reading looks different, the meal, workout and device notes on your sheet can help you decide whether the two visits are comparable. InBody's testing procedure
What should you write down after the scan?
Write the machine name exactly as the gym displays it, along with the date and time. Add how long it had been since you ate and exercised. If something differed from your usual routine, a short note such as “evening appointment after travel” will mean more to you next month than a blank box.
Keep the original result sheet with your notes. Our InBody score guide explains how the summary score relates to the fields below it, including why fat-free mass and skeletal muscle mass have separate labels.
If you also keep progress photos between appointments, match the pose, lighting and distance and save the dates. The photo comparison tool can put those images together. There is no need to assign a scan value to a photo taken on a different day.
What else should you know?
Do I have to fast overnight for an InBody scan?
InBody USA's general guidance calls for a gap of at least three hours after a meal. Ask your testing site what it requires when you book. If meal timing affects your treatment or medication, check with your clinician before changing it for a gym appointment.
Should I drink extra water to get a better InBody result?
Keep your usual hydration routine the day before the test. InBody USA also advises hydrating one hour before testing. Follow any prescribed fluid instructions and tell the operator about them. Changing how much you drink specifically to influence the printout makes it harder to compare visits.
Can I wear socks during an InBody scan?
On the standing models described in the InBody USA procedure, you remove your shoes and socks so your feet contact the electrodes. The operator may provide a preparation tissue for your hands and feet. Ask about accommodations when booking if standing barefoot or gripping the handles presents a problem.
What if I already worked out before my scheduled test?
Tell the person running the test how hard you trained and when you finished. The facility can help you choose a different time or record the circumstances of that visit. On a follow-up, avoid treating a change from that post-workout reading as proof that you gained or lost tissue.
How do I make a repeat visit easier to compare?
Book a similar time of day on the same device, follow the same facility instructions and bring the notes from your first visit. Save both result sheets. Before comparing estimates, check whether the meal schedule, recent exercise, clothing or testing conditions differed in a way worth recording.
Save your visit details
Download the checklist, record this visit and put your repeat appointment in the last field.
Get the printable checklist