Microcurrent Quiz Answers for Esthetics Students, a Study Guide
Medically reviewed by
4 independent reviewers
Andrew Conrad Barile, PT, DPT
Doctor of Physical Therapy (DPT) | Licensed Physical Therapist (PT) | CEO and Founder, Xtreem Pulse LLC
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Dr. Andrew Conrad Barile is a Doctor of Physical Therapy and the CEO and Founder of Xtreem Pulse LLC, the engineering company behind PureLift. He earned his Doctorate in Physical Therapy from Daemen College and is a licensed physical therapist.
He brings over two decades of clinical and entrepreneurial experience across physical therapy, craniosacral therapy and medical device innovation, built on a working knowledge of human anatomy and muscle physiology.
For PureLift LAB he reviews how current is delivered across all ten levels, from sub-sensory nanocurrent and skin-level microcurrent to motor-level EMS, and how the Infuse pass fits into the same ten-minute routine.
Bertica M. Rubio, M.D.
Board-Certified Physician, Dartmouth Medical School | Medical Director, Antiaging Regenerative Medicine Clinic
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Dr. Bertica M. Rubio is a board-certified physician and Medical Director of the Antiaging Regenerative Medicine Clinic in Redlands, California. She earned her Doctor of Medicine from Dartmouth Medical School and completed her pediatrics residency at UC Irvine Medical Center.
With decades of clinical experience, she specialises in age management medicine, regenerative medicine, wound healing and growth factor therapies, and her practice integrates evidence-based medical science with advanced aesthetic treatment.
For PureLift LAB she reviews articles for medical accuracy across the whole dial, from the gentle nanocurrent and microcurrent settings through to muscle-level EMS and the Infuse pass.
Daniel Grinberg, MD, FACS
Board-Certified Otolaryngologist | Head and Neck Surgeon | Fellow, American College of Surgeons | Mount Sinai
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Daniel Grinberg, MD, FACS is a board-certified otolaryngologist and head and neck surgeon at ENT and Allergy Associates in West Nyack, New York. He earned his medical degree from Columbia University College of Physicians and Surgeons.
He completed his otolaryngology residency at New York University Medical Center, serves as Assistant Clinical Professor at Mount Sinai School of Medicine, and is a Fellow of both the American College of Surgeons and the American Academy of Otolaryngology.
For PureLift LAB he brings a wider clinical lens, connecting at-home facial stimulation from microcurrent to EMS to the anatomy underneath, with the same rigour we apply to every device specification.
Prof. Dr. med. Ivo Buschmann
Chair of Angiology, Medizinische Hochschule Brandenburg | Clinic Director, University Clinic for Angiology
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Prof. Dr. med. Ivo Buschmann is Chair of Angiology at the Medizinische Hochschule Brandenburg Theodor Fontane and Clinic Director of the University Clinic for Angiology at the Brandenburg University Hospital.
He trained at the University of Hamburg, was a Max Planck Society Fellow at the Max Planck Institute for Heart and Lung Research, and held senior consultant posts at the Charite Universitatsmedizin Berlin before his appointment as Chair in 2016.
One of Europe's leading authorities on arteriogenesis, with over 150 peer-reviewed publications and US and EU patents, he reviews for PureLift LAB how the evidence on electrical stimulation is read and where its limits lie.
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Most esthetics quiz questions on microcurrent come down to a few facts, that it is a very low current measured in microamperes, that it is used for facial toning without the visible contraction of EMS, that it needs a conductive medium, and that clients with pacemakers, epilepsy, pregnancy or cancer should not be treated.
This study guide covers the topics that come up most, such as:
- units and how small a microamp is
- microcurrent vs galvanic vs EMS
- why a conductive medium is needed
- contraindications to memorize
- basic technique and treatment frequency
and many more!
We make microcurrent devices used by estheticians, so we wrote this the way we would explain it to a new team member, and always check your own textbook and instructor's wording for exams.
Key Points:
Microcurrent is measured in microamperes; one microampere is one millionth of an ampere.
It is used for toning and is usually felt as a light tingle or nothing, unlike EMS, which makes muscles visibly contract.
Galvanic current is a constant direct current used for disincrustation and iontophoresis, not toning.
A water-based conductive gel or serum is needed so current flows evenly.
Common contraindications are a pacemaker or implanted electronic device, epilepsy, pregnancy, active cancer and broken skin.
Units and strength
What unit is microcurrent measured in
Microamperes, written as µA. One microampere is one millionth of an ampere, and one milliampere is one thousandth. A typical answer for the range of facial microcurrent is up to several hundred microamperes, well under one milliampere.
Why the unit matters
The low strength is what sets microcurrent apart from other facial currents. More on the numbers is in our microamps explained article.
Microcurrent vs other currents
| Current | Type | Main use in esthetics | Felt as |
|---|---|---|---|
| Microcurrent | Very low, pulsed | Facial toning | A light tingle or nothing |
| Galvanic | Constant direct current | Disincrustation, iontophoresis | A tingle or warmth |
| EMS | Higher, pulsed | Visible muscle contraction | A twitch or pulse |
| High frequency | Alternating, high frequency | Warming, antibacterial effect on blemishes | A buzz, sometimes a spark |
Detailed comparisons are in our microcurrent vs galvanic article, our microcurrent vs EMS article and our microcurrent vs high frequency article.
Conductive medium
Why is a conductive gel needed
Dry skin resists current, and current concentrates at the few points that touch. A water-based gel or serum lets the current spread evenly and comfortably.
What should be avoided
Oils and heavy creams, which block current. See our conductive serum article.
Contraindications to memorize
Pacemaker or other implanted electronic device.
Epilepsy or seizure disorders.
Pregnancy.
Active cancer, or treatment over a known tumor.
Broken, irritated or infected skin, and recent injectables or procedures in the area until cleared.
Metal implants and thyroid conditions are often listed as cautions; our explanation is in our pacemaker, thyroid and implants article.
Technique questions
Which direction do you work
Most training teaches working with the muscle, moving the probes along its length, and lifting toward the hairline and ears rather than dragging downward. Many systems teach shortening and lengthening movements based on the muscle's origin and insertion.
How often for best results
An initial series, often weekly or more frequently, followed by maintenance. At home, short sessions several times a week.
What is the claimed cellular effect
Textbooks often mention increased ATP, a claim that traces to a 1982 laboratory study on rat skin. How much that early finding applies to facial treatments is discussed in our ATP article.
Practice questions
One millionth of an ampere is called a microampere.
The current used for disincrustation is galvanic current.
A client with a pacemaker should not receive microcurrent.
Microcurrent is used mainly to tone and lift the look of facial muscles.
A conductive gel is applied so the current flows evenly.
The history of the technology is in our who invented microcurrent article, and its uses beyond the face are in our microcurrent therapy uses article.
From school to practice
Clinical evidence is worth knowing for client conversations. A randomized controlled trial by Kavanagh and colleagues, published in 2012, measured the effect of facial electrical stimulation after twelve weeks of regular use.
How microcurrent fits into a treatment menu is in our microcurrent in esthetics article. Our devices run nanocurrent at level 1, microcurrent at level 2 and EMS from level 3 to 10, plus an Infuse pass, on one dial, with a ten minute session and no more than three minutes per side of the face, and they work with any water-based conductive serum.
Frequently asked questions
What is microcurrent measured in
Microamperes. One microampere is one millionth of an ampere.
What is the difference between microcurrent and galvanic current
Galvanic is a constant direct current used for disincrustation and iontophoresis; microcurrent is a very low pulsed current used for toning.
Does microcurrent make muscles contract
Not visibly. EMS makes muscles visibly contract; microcurrent is usually felt as a light tingle or nothing.
What are the contraindications for microcurrent
A pacemaker or implanted electronic device, epilepsy, pregnancy, active cancer and broken or irritated skin.
Why is conductive gel used with microcurrent
So the current spreads evenly instead of concentrating at a few dry points.
This article sits inside our full map of the category, where we set out all 33 devices we track, what each one carries and what each brand publishes: Nine Technologies on One Dial, What the Rest of the Market Actually Carries.