A dermatology practice that adds Mohs surgery is adding a CLIA laboratory. That sentence is the whole article. The cryostat, the stainer and the refrigerator are the visible purchases; the licensing, the records and the equipment file are what decide whether the lab is operating legally on its first surgical day. Here is the sequence as it actually happens in Florida, with the equipment and compliance steps in the order that avoids doing anything twice.
Step 1 — Decide what the lab will be, on paper
Mohs frozen-section histology is classified as high complexity under CLIA. That determines everything downstream: the lab director qualifications, the personnel standards, the proficiency testing and the inspection cadence. Before buying anything, settle three things:
- Who is the CLIA laboratory director — for high complexity, a board-certified pathologist or a physician who meets the CLIA 493.1443 qualifications. Many Mohs surgeons qualify; confirm before applying.
- Which accreditation route — a CLIA certificate of accreditation through CAP or COLA, or a certificate of compliance inspected directly by the state. CAP is the most common choice for Mohs labs that want a recognized quality program; the equipment documentation burden is similar either way.
- Whether you need a Florida clinical laboratory license — Florida's state licensure requirement for clinical labs was repealed in 2018, so for most Mohs labs the CLIA certificate is the operating license. AHCA still licenses the facility if it is an ambulatory surgical center, and AHCA surveyors still walk through the lab.
Step 2 — Apply for CLIA before the equipment arrives
File CMS Form 116 with the Florida CLIA program (administered through AHCA). Processing takes weeks, and you cannot report a patient result — which includes a frozen-section read that guides the next Mohs stage — until the certificate is issued. Order the equipment while the application is in process, not after.
Step 3 — Specify the equipment as a system, not a shopping list
A Mohs lab is a short line: cryostat, stainer or manual staining setup, refrigerator, and the small instruments around them. Every one of them is inspected, so specify them for documentation as much as for performance.
- Cryostat — the single most important purchase. Current Leica, Thermo/Microm, Sakura and Avantik models all cut well; what matters is chamber temperature stability, ease of decontamination, and whether your service vendor stocks parts and can put a loaner in the room when it goes down. Ask that question before you sign, not after.
- Stainer — a linear or automated H&E stainer for consistent sections at Mohs speed, or a manual dip-station for lower-volume labs. Either way, reagent logs and PM records are inspected.
- Refrigerator and freezer — for reagents, controls and tissue. Needs a NIST-traceable thermometer, continuous temperature monitoring or a twice-daily log, and an alarm. This is the most common Mohs lab finding in Florida because it is the easiest to forget.
- Small instruments — pipettes, timers, thermometers, a slide warmer or hot plate, a microscope. Each needs a calibration or verification record.
- Powered devices in the suite — hyfrecators, electrosurgical units, exam tables, lasers. These fall under NFPA 99 electrical safety, which AHCA and Joint Commission surveyors check even though CLIA does not.
- Fume extraction — formalin and xylene handling at the grossing station. A ducted or filtered hood, certified annually.
Step 4 — Install, verify, and start the equipment file on day one
This is where most new labs lose a year. Every instrument needs an initial verification before patient use — chamber temperature verification on the cryostat, thermometer calibration against a reference, pipette calibration, electrical safety test on every powered device — and a file that shows it. The file should contain, per instrument:
- Make, model, serial number and installation date
- Initial calibration or verification certificate, NIST-traceable where applicable
- The preventive maintenance schedule and the manufacturer's recommended intervals
- Every subsequent service, repair and verification record, retained for at least two years
Surveyors don't grade the cryostat. They grade the file that proves the cryostat was verified.
Step 5 — Write the procedures and validate the method
CLIA requires written procedures for every step from tissue receipt to slide reading, plus a validation showing the frozen-section method produces reliable results in your hands. For Mohs, that is usually a documented comparison run before go-live and a quality program for section quality afterward. Equipment enters here again: the cryostat temperature log, the stainer QC slide, and the refrigerator log are all part of the daily QC record.
Step 6 — Enroll in proficiency testing and set the inspection clock
CAP-accredited Mohs labs enroll in the appropriate PT program and are inspected every two years, with a self-inspection in between. State-inspected labs run on a similar cycle. From go-live, you are always less than two years from a surveyor walking in and asking for the file from Step 4.
Step 7 — Plan for the day the cryostat dies
It will, and it will be a surgical day. Decide now: who do you call, how fast do they answer, and can they put a verified loaner cryostat in the room before cases are cancelled? A service agreement that includes emergency response and loaner coverage is cheaper than one cancelled Mohs day. Build it into the budget with the equipment, not as an afterthought after the first failure.
What it costs, roughly
Equipment for a single-cryostat Mohs lab in Florida typically lands between the mid-five and low-six figures depending on new versus refurbished and how much automation you buy. Add CLIA and accreditation fees, the initial verification and electrical safety work, and a service agreement. The line most practices underestimate is not the cryostat — it is the ongoing documentation program that keeps the lab inspection-ready, which is why most Mohs labs outsource it.
How BMCA fits
BMCA sets up Mohs labs across Florida and Puerto Rico as one project: equipment specification and installation, initial verification of every instrument, the equipment file built in your client portal from day one, NFPA 99 testing on every powered device, and a service agreement with loaner coverage for the cryostat. If you are adding Mohs to an existing dermatology practice, a free readiness assessment will tell you what you already have that qualifies and what you still need.
Common questions
Does a Mohs lab in Florida need a state laboratory license?
Not since 2018, when Florida repealed state clinical-laboratory licensure. The CLIA certificate is the operating credential. If the practice is a licensed ambulatory surgical center, AHCA still licenses and surveys the facility.
Is Mohs frozen-section histology high complexity under CLIA?
Yes. Histopathology, including frozen sections, is classified as high complexity, which sets the director qualifications, personnel standards and inspection requirements.
How long does a CLIA certificate take?
Typically several weeks from a complete application. File as soon as the director and accreditation route are decided; do not wait for the equipment.
Can we start with a used cryostat?
Yes, if it is decontaminated, verified and documented like a new one. Ask for a decontamination certificate and a service history before purchase, and have chamber temperature verified on installation.
What is the most common Mohs lab inspection finding?
In our experience across Florida: refrigerator temperature records — a missing log, an uncalibrated thermometer or no alarm. It is also the cheapest finding to prevent.
Not sure where your equipment stands?
Request a free Compliance & Equipment Readiness Assessment — we’ll spot-check your gear and documentation and leave you a short report.