LVL Patch Testing

Why patch testing is important?

Here at Nouveau Lashes, we’re constantly looking for ways to improve things. Patch tests are one of the most important aspects of LVL Lash Lift treatments. Patch tests are important for insurance reasons, the client’s experience (they could react to the products used during LVtreatments) and to demonstrate professionalism. In short, the patch testing process helps protect both lash artists and their clients as much as possible. 

LVL Patch Testing Process

  • Patch tests do not need to be carried out for every single LVL treatment
  • Patch tests are required prior to the first LVL treatment, then after 6 months (if they haven’t had a treatment in that time). Existing LVL clients will need to be patch tested ahead of using the new LVL CeraLashLift System
  • A patch test must be carried out if there are any changes to your client’s medical situation since their last treatment
  • Lash artists must wear gloves during LVL treatments and when patch testing clients, to prevent repeat exposure to treatment chemicals
  • LVL CeraLashLift System Patch Tests include six single-use LVL CeraLashLift System Patch Tests (Steps 2 & 3) and six patch test instruction cards. These do not include LVL CeraLashTint
  • If performing the classic LVL treatment, use the use the classic LVL patch tests (pack of 5)

Patch Testing Guidelines


be carried out on new clients, those returning after 6 months, those with any changes in medical history or any existing clients getting their first treatment with the LVL CeraLashLift System


at site of patch test must be reported to a salon professional as soon as possible


must not be carried out on someone that has previously had a reaction to PPD or black henna tattoos


be applied in a visible location, on the inside of the arm and covered with a hypoallergenic plaster or micropore tape


be left on skin for 48 hours and kept dry

Frequently Asked Questions

Why did the patch testing process change?

In late December 2020, we made changes to our patch testing process after reviewing with a medical expert and our insurance partner. From our evaluation, it became clear there have been advancements in medical understanding of allergic reactions, which indicate that increased exposure can increase sensitivity. On this basis, these changes have been made to minimise exposure and limit the possibility of increased sensitivity to the chemicals in patch tests for lash artists and their clients. Reducing the frequency of patch tests will also reduce the time and money spent on facilitating these and can make the client booking process more flexible.

Where should the patch test be carried out, and by who?

Some insurance providers prefer the patch test to be carried out in sight of a professional, others are happy for the client to do this at home. Check your insurance policy documents for details.

Is it okay to patch test with LVL products that have been exposed to air for over 24 hours?

The key actives in the formulations start reacting as soon as exposed to air. We’ve tested ourselves that once exposed, their ability to create a lift diminishes quickly. However, the ingredients themselves remain and so while they’re rendered ineffective for a good quality treatment, you’re patch testing the presence of the ingredients and not their efficacy.

How long should patch tests be left on the skin?

48 hours. When a new product is first introduced it can take up to 48 hours for the body to develop a reaction to it. Following expert advice from Consultant Dermatologist Dr Justine Hextall, we choose to leave patch tests on the skin for 48 hours in total. Although a patch test does not guarantee no subsequent reactions, it should eliminate the majority of cases.

Do I need to patch test every client before every treatment?

Patch tests don’t need to be carried out for every single LVL treatment. Patch tests are required prior to the first treatment, then after 6 months (if they haven’t had a treatment in that time). A patch test must also be carried out if there are any changes to a client’s medical situation.

Do I need to re-patch test all my existing clients when switching to the LVL CeraLashLift System?

Yes, due to a change in formula, patch tests will be required for all clients trying the LVL CeraLashLift System for the first time. Trust us, it’s worth it for the results you’ll get! To give you a helping hand, we’ll be sending out a free pack of patch tests when you purchase one of our new treatment kits.

Does this change to patch test guidelines impact my insurance?

Please check your insurance policy documents. 

Can my client sign a waiver form instead of doing a patch test?

Some insurers are happy for you to proceed with a treatment having offered the patch test which has been declined by the client but will require a signature to confirm they have declined the test. Most insurers will not cover you unless a patch test has been undertaken so a waiver would be unacceptable. Their requirements will be clearly defined in your policy documents. 

Does the COVID-19 vaccine impact when and how we patch test customers?

There is currently no official advice from the government, the vaccine manufacturers, or our own insurers with regards to conducting treatments and patch tests on clients who have received a COVID-19 vaccine and/or who have previously tested positive for COVID-19. 

After your client has received the vaccine, you may choose to wait to undertake a patch test to help ensure the side effects are not confused with a patch test reaction. Otherwise, standard patch testing guidelines apply. 

As a change in medical history requires a patch test to be carried out, a patch test should be carried out before a treatment is performed on a client that has suffered from COVID-19 or received a COVID-19 vaccine (please note, any vaccine is considered a change in medical history). 

Need more support on patch testing?

Our Customer Specialists will help answer any further questions.

CONTACT US ON - 01977 655620