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Working Out: How Long to Wait. If you have a workout routine that is scheduled for a few times a week, try to wait at least 48 hours after getting your tattoo before you work out. However, if you are in training or cannot function without a daily workout, you can cut the time to 24 hours.
When you give blood after getting a tattoo, you may want to wait at least a week, even if you are allowed to give blood right away, as tattoos often cause low-level inflammation. Giving your body a chance to recover will ensure that your blood passes the screening procedures used to test donations.