Guides for lash, brow and threading studios
Patch tests and consent forms for lash and brow services
Updated: November 15, 2026
When to patch test, how long to wait, what a lash or brow consent form usually asks, and how to book a patch test as its own short appointment.
Why studios patch test
Lash adhesive and lift or tint products can cause reactions in some clients. A small test before the first full service shows you early, and a record that the client took (or declined) it protects you if something goes wrong.
When to do it
- Before a client’s first lash set, lift, tint or lamination with you.
- Again if you change adhesive or product, or the client tells you about a new allergy or medication.
- At least 24 to 48 hours before the full appointment. Some studios ask for 72 hours.
What a consent form usually asks
- Allergies, especially to adhesives, latex, dyes or cosmetics.
- Eye conditions, recent eye surgery, contact lenses, and whether the client is pregnant.
- That the client had, or declined, a patch test.
- Aftercare the client agrees to follow, and how you handle reactions.
- Permission to take before-and-after photos, if you post them.
Have a lawyer or your insurer look over the wording you use; this list is a starting point, not a template you can rely on.
Book it like any other service
Put a short “patch test” service on your menu, such as 15 minutes with no charge or a small one. New clients book it first, then the full set a day or more later. If you use FaceInLine, the chat offers it like anything else and you confirm both requests yourself.
FaceInLine does not keep consent forms or test results. Keep them the way you do now: on paper, or in a form tool you trust.
Questions
What if a client refuses a patch test?
Many studios have the client sign that they declined it, and some won’t book the service at all. It’s your choice; write it into your policy.