FDA 483 Citations for Production and Process Controls Under 21 CFR 820.70(a)

Two observations about production and process controls appeared on system-generated Form FDA 483s in fiscal year 2025:

• "Process control procedures that describe any process controls necessary to ensure conformance to specifications have not been [adequately] established," 820.70(a), 27 times

• "Production processes were not [developed] [conducted] [controlled] [monitored] to ensure that a device conforms to its specifications," 820.70(a), 16 times

These citations go to the core of manufacturing. They often appear after an investigator follows a complaint or nonconformance back to the production floor and finds that the process was never defined well enough to produce consistent results.

What the citations mean

Examples written after "Specifically" usually describe:

• Operators building devices from memory, with no work instructions

• Work instructions that omit key parameters, such as torque, temperature, cure time or adhesive amount

• Process parameters not monitored or recorded during production

• No workmanship standards for visual criteria, such as cosmetic defects, solder joints or bond lines

• Equipment settings changed by operators without approval

• Processes that drift with no in-process checks to detect it

• Production changes made without review, verification or validation

What 21 CFR 820.70(a) required

Under the Quality System Regulation, each manufacturer had to develop, conduct, control and monitor production processes to ensure that a device conforms to its specifications. Where deviations from device specifications could occur as a result of the manufacturing process, the manufacturer had to establish process control procedures that describe any process controls necessary to ensure conformance. Where process controls were needed, they had to include:

• Documented instructions, standard operating procedures and methods that define and control the manner of production

• Monitoring and control of process parameters and component and device characteristics during production

• Compliance with specified reference standards or codes

• The approval of processes and process equipment

• Criteria for workmanship, expressed in documented standards or by means of identified and approved representative samples

Section 820.70(b) also required procedures for changes to a specification, method, process or procedure, with verification or validation before implementation.

What changed under QMSR

Under QMSR, in effect since February 2, 2026, these requirements come from ISO 13485:2016 clause 7.5.1, Control of production and service provision. Production must be planned, carried out, monitored and controlled to ensure product conforms to specification. As appropriate, production controls must include:

• Documentation of procedures and methods for the control of production

• Qualification of infrastructure

• Implementation of monitoring and measurement of process parameters and product characteristics

• Availability and use of monitoring and measuring equipment

• Implementation of defined operations for labeling and packaging

• Implementation of product release, delivery and post-delivery activities

Clause 7.5.6 covers validation of processes whose output cannot be verified, and clause 4.1.4 requires changes to processes to be evaluated for their impact on the quality management system and the devices produced. Risk management under clause 7.1 should drive which process controls are needed.

How to respond to the 483

FDA generally considers responses received within 15 business days of the close of the inspection before deciding on further action.

Assess product made under uncontrolled conditions

For the process cited, determine whether product built without defined controls could be nonconforming. Use inspection data, retained samples, complaint history and testing. Disposition affected product and evaluate the need for a field action.

Characterize the process

Identify the parameters and characteristics that affect product quality, using process risk analysis such as a process FMEA. Define the target values and ranges for each parameter.

Write the controls down

• Work instructions with steps, parameters, equipment, materials and pictures where useful

• In-process checks and their frequency

• Workmanship standards or approved samples for visual criteria

• Records of key parameters for each lot

• Controls on equipment settings, such as locked recipes or setup verification

Apply change control

Require review, verification or validation and approval before any change to the process, equipment or instructions.

Extend to other processes

Review the other production processes against the same standard and report the plan.

What compliant production control procedures contain

• How production processes are planned and documented

• Work instruction format and approval

• Process parameter monitoring and recording

• Workmanship standards

• Equipment qualification and setup verification

• Line clearance between lots or products

• Production and process change control

• Links to process validation, risk management and nonconforming product

Common mistakes in production control responses

• Writing instructions that describe the ideal process rather than the actual one

• Leaving out the parameters that matter most

• Monitoring parameters but not defining what to do when they go out of range

• Fixing one process and ignoring similar ones

• Forgetting process risk analysis, so controls are not linked to failure modes

Example: how one response section might read

This illustrates structure only; your response must describe your own facts.

Observation 10: Process control procedures have not been adequately established. Specifically, the UV adhesive bonding of the needle hub has no documented cure time, lamp intensity or bond strength check.

Response:

• Product assessment: Pull tests on retained units from the last 12 lots met specification. No bond-related complaints were found in three years.

• Process characterization: A process FMEA was completed on a stated date. Cure time, lamp intensity and adhesive volume were identified as key parameters, and ranges were set from engineering studies.

• Corrective action: A revised work instruction defines each parameter. Lamp intensity is verified at the start of each shift, and two pull tests per lot are recorded in the batch record.

• Extended review: The remaining 17 production processes were assessed. Four need additional controls, scheduled by stated dates.

• Verification: Quality will review bonding records and pull test results for six months.

Frequently asked questions

Does every process need written instructions?

Every process where a deviation could cause a device not to meet specification needs the controls required to prevent it. Documented procedures and methods are the usual way to show this.

How do process controls relate to process validation?

When a process output cannot be fully verified by later inspection and test, the process must be validated (clause 7.5.6). Validated processes still need the monitoring and control described here.

Are workmanship samples acceptable?

Yes. Approved representative samples or documented standards are acceptable ways to define visual criteria.

How A.P. Lyon documents help

A.P. Lyon's ISO 13485 QMS Manufacturing Plus includes production, line clearance and process control procedures. Individual procedures include the Line Clearance Procedure, the Process Risk Management Procedure and the Medical Device Process Validation Procedure.

Documents are editable Word and Excel files and must be adapted to your processes and organization. Parameters and limits must come from your own engineering work.

Next steps

• Assess product made under the cited process

• Characterize the process and document its key controls

• Put production changes under change control

• Respond within 15 business days with dates for each action

Related guides: Process Validation Citations and Equipment Maintenance Citations.

To build a complete set of procedures at a volume discount, use Build Your QMS. For help with a 483 response, see A.P. Lyon consulting services.

Not sure where your quality system stands? Take the free QMS gap check: about 20 questions, an instant report of your gaps by clause, and the procedures that close each one.