Do Thermometers Require FDA Registration?
This guide explains which thermometers fall under FDA medical device regulations, how they are classified, what 510(k) clearance requires, and every compliance step for manufacturers selling clinical thermometers in the United States.
Which Thermometers Are FDA Medical Devices?
The single most important factor is intended use. A thermometer that measures body temperature for health or clinical purposes is a medical device. The same physical measurement technology used to measure food or room temperature is not. The table below covers the most common thermometer types:
| Thermometer Type | Class | Product Code | 510(k) Required? | Notes |
|---|---|---|---|---|
| Electronic clinical thermometer (oral, rectal, axillary) | Class II | FPA | Yes — 510(k) required | 21 CFR Part 880.2920. ASTM E1112 performance standard typically cited. |
| Non-contact infrared thermometer (body temperature) | Class II | FPA | Yes — 510(k) required | COVID-era EUAs mostly expired. Current products need 510(k) unless exempt. |
| Tympanic (ear) thermometer | Class II | DSQ | Yes — 510(k) required | IEC 80601-2-56 performance standard typically cited. |
| Temporal artery (forehead) thermometer | Class II | FPA | Yes — 510(k) required | Measures body temperature; classified as clinical thermometer. |
| Mercury clinical thermometer | Class I | FLK | Exempt (general controls only) | 21 CFR Part 880.2900. Largely discontinued due to mercury hazard. |
| Kitchen / food thermometer | Not a medical device | N/A | N/A | Intended for food temperature measurement. Not subject to FDA medical device regulations. |
| Oven / room / HVAC thermometer | Not a medical device | N/A | N/A | General-purpose temperature measurement. Not FDA-regulated as a device. |
Product codes and classifications should be confirmed in FDA's Product Classification Database before preparing a 510(k) submission. Intended use labeling determines classification — a dual-use product labeled for both medical and non-medical purposes is regulated as a medical device.
FDA Compliance Requirements for Clinical Thermometer Manufacturers
Every manufacturer of FDA-regulated clinical thermometers selling in the United States — domestic or foreign — must meet the following requirements:
510(k) Premarket Notification for Clinical Thermometers
A 510(k) is a premarket submission to FDA demonstrating that a medical device is substantially equivalent to a legally marketed predicate device. For most clinical thermometers, it is the mandatory step before U.S. marketing. FDA clearance — not approval — is the outcome; clearance means FDA has reviewed the submission and found the device substantially equivalent to the predicate.
What the 510(k) Must Demonstrate
The 510(k) must show the device has the same intended use as the predicate (measuring body temperature for clinical purposes) and either the same technological characteristics, or different characteristics that do not raise new questions of safety and effectiveness. For thermometers, this means the 510(k) must include:
Device description — complete description of the thermometer including measurement technology (electronic contact, infrared, tympanic, temporal), measurement site, display, battery, and software if applicable.
Substantial equivalence comparison — side-by-side comparison of the new device to the predicate on intended use and technological characteristics. Any differences from the predicate must be explained and shown not to raise new safety or effectiveness questions.
Performance testing — accuracy and precision testing against a reference standard thermometer, typically per ASTM E1112 (for electronic thermometers for intermittent determination of patient temperature) or IEC 80601-2-56 (for clinical thermometers for body temperature measurement). Testing must include clinical studies or bench testing across the relevant temperature range with adequate sample sizes.
Labeling — the proposed device label and instructions for use, reviewed against 21 CFR Part 801 requirements.
FDA's average review time for a standard 510(k) is approximately 90–120 days from the date of acceptance (not submission). Total time from submission to clearance, including the initial review and any additional information requests, is typically 6–12 months for a well-prepared submission.
Class I Exempt Thermometers
Some thermometer types are Class I and 510(k) exempt — they require only general controls (Establishment Registration, Device Listing, labeling compliance, and QMSR). Mercury clinical thermometers (product code FLK) are an example, though they are largely discontinued in the U.S. market due to environmental hazard concerns. Any Class I thermometer must confirm its specific product code is exempt — not all Class I medical devices are 510(k) exempt.
COVID-Era EUAs and Enforcement Discretion
During the COVID-19 pandemic, FDA issued Emergency Use Authorizations (EUAs) and enforcement discretion guidance that temporarily allowed certain non-contact infrared thermometers to be marketed without 510(k) clearance for fever screening purposes. Most of these policies have since expired. Companies currently marketing non-contact infrared body thermometers must have 510(k) clearance — relying on expired COVID-era policies is a significant compliance risk.
The QMSR — Quality System Update Effective February 2026
On February 2, 2026, FDA's Quality Management System Regulation (QMSR) became effective, replacing the former Quality System Regulation (QSR) at 21 CFR Part 820. This is the most significant change to FDA's quality system requirements in decades. The QMSR incorporates ISO 13485:2016 by reference — meaning FDA's quality system requirements now align directly with the international standard used in the EU, Canada, Japan, Australia, and other major markets.
For thermometer manufacturers already certified to ISO 13485:2016, the QMSR alignment is largely positive — your existing quality management system is much closer to QMSR compliance than to the former QSR. However, the QMSR is not identical to ISO 13485; there are FDA-specific provisions, particularly around complaints handling, corrective and preventive actions (CAPA), and design controls, that require specific attention.
Key QMSR implications for thermometer manufacturers: design history files must be maintained per QMSR requirements; complaint files and MDR reporting processes must align with both QMSR and 21 CFR Part 803; and risk management documentation under ISO 14971 is increasingly expected in 510(k) submissions for Class II devices. FDA has stated that ISO 13485 third-party audit certificates are not substitutes for FDA inspectional authority, but a well-documented QMSR-compliant quality system significantly reduces inspection risk.
Most Common FDA Compliance Errors for Thermometer Manufacturers
Marketing Without 510(k)
Selling a Class II clinical thermometer in the United States without 510(k) clearance is a prohibited act. FDA can issue a warning letter, detain imports, or pursue seizure. This is the most common and most serious compliance failure for thermometer manufacturers entering the U.S. market for the first time.
Relying on Expired COVID Policies
Non-contact infrared thermometer brands that entered the U.S. market under COVID-era EUAs or FDA enforcement discretion policies must confirm their current compliance status. Most of those policies have expired. Marketing a non-contact thermometer under a lapsed EUA is the same as marketing without clearance.
Incorrect Product Code
Using the wrong FDA product code when preparing a 510(k) submission leads to selecting an incorrect predicate device, misunderstanding applicable special controls, and potentially receiving FDA questions that could have been anticipated. Confirming the correct product code before 510(k) preparation is essential.
Missing or Non-Compliant UDI
Class II thermometers have been subject to UDI requirements since 2016. A thermometer without a compliant UDI on the label — or whose UDI has not been submitted to GUDID — is in violation of 21 CFR Part 830. UDI compliance is frequently overlooked by foreign manufacturers unfamiliar with the U.S.-specific requirement.
Not Updating Device Listing
Introducing a new thermometer model without updating Device Listing is a prohibited act. Each new model must be individually listed with FDA. Many companies with multiple product lines add new variants without understanding that each variant requires its own device listing entry.
Missing Annual Renewal
Medical Device Establishment Registration must be renewed annually — October 1 through December 31. An expired establishment registration affects the ability to legally market devices and import products. Unlike the food facility Biennial Renewal, device establishment registration requires annual action every year.
Ready to Register Your Thermometer with FDA?
FDA Registration Assistance handles Medical Device Establishment Registration, U.S. Agent designation, Device Listing, annual renewal management, UDI guidance, and labeling review for thermometer manufacturers. For 510(k) submissions, the firm advises on submission strategy and predicate selection.
Contact us at info@fdaregistrationassistance.com or call +1 (928) 275-8333. 1,000+ clients. 135+ countries. 15+ years of FDA regulatory experience.
Frequently Asked Questions — FDA Registration for Thermometers
1. Do thermometers require FDA registration?
It depends on intended use. Thermometers intended to measure human body temperature for clinical or health purposes are FDA-regulated medical devices requiring Device Listing, Establishment Registration, and in most cases 510(k) clearance. Thermometers for non-medical purposes (kitchen, oven, room) are not FDA-regulated medical devices.
2. How does FDA classify clinical thermometers?
Electronic clinical thermometers are classified under 21 CFR Part 880.2920 (product code FPA) as Class II medical devices subject to Special Controls. Most require 510(k) premarket notification. Tympanic (ear) thermometers typically fall under product code DSQ. The specific product code determines the classification, applicable special controls, and 510(k) predicate landscape.
3. Does a thermometer manufacturer need to register their establishment with FDA?
Yes. Any establishment manufacturing thermometers for U.S. commercial distribution must register under 21 CFR Part 807. Foreign establishments must designate a U.S. Agent. Annual renewal window: October 1 – December 31 every year.
4. Does each thermometer model need to be listed with FDA?
Yes. Each medical device model must be individually listed with FDA under 21 CFR Part 807. Device Listing must be updated when new models are introduced or when existing device information changes. Failure to list a device is a prohibited act under the Federal Food, Drug, and Cosmetic Act.
5. Do clinical thermometers require a 510(k)?
Most Class II electronic clinical thermometers — digital oral, rectal, axillary, tympanic, infrared, and temporal artery models — require 510(k) premarket notification under 21 CFR Part 807 Subpart E. 510(k) clearance must be obtained before marketing in the United States. Class I thermometers that are 510(k) exempt require only general controls.
6. What is the difference between Class I and Class II thermometers?
Class I devices present minimal potential harm and are subject to general controls only — Establishment Registration, Device Listing, labeling, and QMSR. Some Class I devices are 510(k) exempt. Class II devices present moderate risk and require special controls plus 510(k) premarket notification. Most electronic clinical thermometers are Class II.
7. Are non-contact infrared thermometers medical devices?
Yes, when intended for body temperature measurement. They are generally Class II devices requiring 510(k) clearance. COVID-era EUAs and enforcement discretion policies for fever-screening thermometers have mostly expired. Companies currently marketing non-contact infrared body thermometers should have 510(k) clearance or confirm their device qualifies for an applicable exemption.
8. Are kitchen or food thermometers FDA-regulated medical devices?
No. Thermometers intended solely for measuring food, oven, refrigerator, or room temperature are not FDA-regulated medical devices. They do not require Establishment Registration, Device Listing, or 510(k) clearance. The intended use as stated in labeling determines whether FDA medical device regulations apply.
9. What quality system requirements apply to thermometer manufacturers?
Thermometer manufacturers must comply with FDA's Quality Management System Regulation (QMSR), effective February 2, 2026, which replaced the former QSR at 21 CFR Part 820. The QMSR aligns with ISO 13485:2016 and covers design controls, document controls, CAPA, complaints handling, and management review.
10. Do thermometers require Unique Device Identifier (UDI) labeling?
Yes. Class II thermometers have been subject to UDI requirements under 21 CFR Part 830 since September 24, 2016. The UDI must appear on the device label and must be submitted to FDA's GUDID (Global Unique Device Identification Database) through AccessGUDID before distribution.
11. What happens if a thermometer is marketed without 510(k) clearance?
Marketing a Class II thermometer without 510(k) clearance is a prohibited act under 21 U.S.C. § 331. FDA can issue warning letters, detain or refuse imports at U.S. ports, seize devices, seek injunctions, and impose civil penalties. Import detention is the most common consequence for foreign manufacturers.
12. Does a foreign thermometer manufacturer need a U.S. Agent?
Yes. All foreign medical device establishments registered with FDA must designate a U.S. Agent under 21 CFR Part 807.40. The U.S. Agent serves as FDA's domestic contact for the foreign establishment and must be reachable and responsive during U.S. business hours.
13. What labeling requirements apply to thermometers?
Thermometer labels must comply with 21 CFR Part 801: device name; manufacturer/distributor name and address; intended use; adequate directions for use; required warnings; and a Unique Device Identifier (UDI). Consumer-use thermometer labels must be in English and sufficient for safe use without professional supervision.
14. What is a 510(k) and how does it work for thermometers?
A 510(k) is a premarket submission demonstrating substantial equivalence to a legally marketed predicate device. For thermometers, it includes a device description, comparison to the predicate, performance testing data (typically per ASTM E1112 or IEC 80601-2-56), and proposed labeling. FDA's average review time is 90–120 days from acceptance; total time to clearance including additional information requests is typically 6–12 months for a well-prepared submission.
15. What performance standards apply to clinical thermometers?
Relevant recognized consensus standards include ASTM E1112 (electronic thermometers for intermittent determination of patient temperature) and IEC 80601-2-56 (medical electrical equipment — clinical thermometers for body temperature measurement). 510(k) submissions for clinical thermometers typically include testing data demonstrating compliance with the applicable standard.
16. How often must Establishment Registration be renewed for thermometer manufacturers?
Medical Device Establishment Registration must be renewed annually — October 1 through December 31 every year. This is different from FDA Food Facility Registration, which renews every two years. Missing the annual device renewal results in an expired registration that affects marketing and import eligibility.
17. Can a thermometer be imported into the U.S. without 510(k) clearance?
No, unless specifically exempt. A Class II thermometer without 510(k) clearance will be subject to refusal of admission at the U.S. port of entry as an adulterated or misbranded device under 21 U.S.C. § 381. The device must have 510(k) clearance on file, qualify for a recognized exemption, or be imported under an IDE for research.
18. What is the product code for clinical electronic thermometers?
The primary FDA product code for electronic clinical thermometers is FPA, classified under 21 CFR Part 880.2920 as Class II. Tympanic thermometers may fall under product code DSQ. Confirming the correct product code in FDA's Product Classification Database before 510(k) preparation is an important first step.
19. What is the QMSR and how does it affect thermometer manufacturers?
The Quality Management System Regulation (QMSR) became effective February 2, 2026, replacing the former QSR at 21 CFR Part 820. The QMSR incorporates ISO 13485:2016 by reference. Manufacturers already certified to ISO 13485:2016 will find significant overlap, but should review QMSR-specific provisions on complaints handling, CAPA, and design controls.
20. Are forehead thermometers and ear thermometers the same regulatory category?
Both are Class II medical devices requiring 510(k) clearance, but they may use different product codes — tympanic thermometers typically fall under DSQ while temporal artery thermometers typically fall under FPA. The 510(k) must select an appropriate predicate for the specific measurement site and technology.
21. Does a thermometer manufacturer need registration if they only sell to hospitals?
Yes. FDA Establishment Registration, Device Listing, and 510(k) requirements apply regardless of distribution channel. A thermometer sold only to hospitals is still a regulated medical device with the same compliance obligations as a consumer product.
22. What is GUDID and does it apply to thermometers?
GUDID — the Global Unique Device Identification Database — is FDA's publicly accessible device identifier database. Class II thermometer manufacturers must submit device identifier information to GUDID through AccessGUDID before distribution. GUDID submission is separate from Device Listing and both are required.
23. What are the most common FDA compliance mistakes for thermometer manufacturers?
Most common mistakes: marketing without 510(k) clearance; relying on expired COVID-era EUAs or enforcement discretion policies; incorrect product code selection leading to wrong predicate strategy; missing or non-compliant UDI on the label; not updating Device Listing for new models; and missing the annual Establishment Registration renewal.
24. Can FDA Registration Assistance handle the full compliance process for thermometer manufacturers?
Yes. FDA Registration Assistance provides Medical Device Establishment Registration, U.S. Agent designation, Device Listing, annual renewal management, UDI guidance, and labeling review. For 510(k) submissions, the firm advises on submission strategy and predicate selection, and can connect manufacturers with specialized 510(k) consultants where needed.
25. How do I get started with FDA compliance for my thermometer?
Contact FDA Registration Assistance at info@fdaregistrationassistance.com or +1 (928) 275-8333. Provide your thermometer's intended use, product description, and U.S. market plans. FDA Registration Assistance will confirm the applicable product code and classification, advise on 510(k) requirements, and handle Establishment Registration, U.S. Agent designation, Device Listing, and labeling review.
