If you're unwell on the day of your appointment, we recommend rescheduling. An acute illness - a cold, flu, infection, or fever - can temporarily skew several biomarkers (for example inflammation and immune markers), so your results would reflect the illness rather than your usual health.
What to do:
Wait until you've recovered before doing your blood draw.
Reschedule from your account - changes made more than 24 hours before your appointment are free and unlimited.
If you're unsure whether to postpone, message us in the in-app chat and we'll help you decide.
Minor, stable ongoing conditions are usually fine - this guidance is about acute illness around the time of your test.