A Dirty Hold Time Study during the cleaning validation process calculates the longest period of time manufacturing equipment can stay dirty after the production of a product before the established cleaning process begins. It establishes whether residues will be able to be removed after being subjected to a specified holding condition and if any delays produce any extra chemicals or microbiological risks.
The dirty hold time starts when the manufacturing or processing of the product is over and finishes when the cleaning begins. It is different from clean hold time, which is the time between the cleaning process and the use of the equipment that follows its cleaning.
In the pharmaceutical production process, the distinction matters because residue from the product can dry out, solidify, oxidize, degrade, or serve other purposes before the equipment has a chance to be used. A procedure may work just fine after the production process while it might not work after some time.
The danger does not apply only to chemical residues. Processing machines with residues of moisture and product can serve as a medium for microorganism growth if the conditions are right. This point is essential for production with respect to products active to microorganisms, processes carried out with water, and equipment engaged in processes of microbiological nature.
The EC provided by the EU GMP in its Annex 15 highlights that particular concern should be presented with regard to the time between manufacture and cleaning of the item, as well as between cleaning and its use. The FDA also mentioned the importance of controlling time between the end of the process and its cleaning while administering the procedures of cleaning validation inspection.
When it comes to the equipment choice, it shouldn’t be based on the fact that the steel surface is easy to handle. A task performed on such a surface may no represent a vessel outlet, transfer line, discharge valve, gasket, agitating rod, and any other difficult to clean spot.
If a certain family of products or a group of equipment is used, there should be a scientific reason for this choice. Simply stating that the size of the equipment or product category is the only criterion is not enough.
The selection of the planned duration should mean maximum delay for each concern which would be considered as the time that routinely occurs for operations.
There is no single period for dirty hold time which applies to all processes in the pharmaceutical sector,. No specific time such 24, 48, or 72 hours should be set with no justified reason for chosen time considering particular equipment, cleaning method and operation.
Creating procedure allows dirty equipment for variable time periods, it should challenge determined maximum under representative/usually conservative conditions.
Direct surface sampling, generally, swabbing, is good for locations where residues can reside or dry. Rinse sampling may be adequate for larger surfaces or machines when there is no direct access but the rinse technique suits the target residue recovery. The sampling method should be valid based on the device construction and the research aim.
The analytical technique should be adequate for the target residue and be able to analyze samples for the specified acceptance limit. The recovery studies have to show that the sampling and analytical methods can recover the residue from the target surfaces.
Depending on the particular product and the cleaning process used, testing may involve:
A negative result does not mean that there is no residue in the tested environment. The result only indicates that the method used did not identify substance above its quantifiable level in the tested sample.
The main question is whether the accepted cleaning process is capable of eliminating residues to the required degree, as described in the protocol after the specified dirty holding period of time. The study must be based neither on random residue level drop nor on visual cleanliness only.
In a situation where a manufacturing vessel has dry residues after a significant delay in between cleaning cycles, if the next cleaning run comes up to the residue criteria outlined in the documentation, the findings will justify the possibility of that hold time. However, in case the acceptance limit for residues is breached at least at one location, this study will not be considered as sufficient proof of good cleaning condition. The project team must investigate this outcome instead of simply ignoring it instead of saying other samples proved proper cleaning.
The protocol must clearly state how any unexpected results, deviations, or failures of acceptance criteria will be dealt with. Any repeated testing must be scientifically substantiated and registered. Repeating cleaning or resampling until satisfactory results are achieved cannot be used to hide the failure condition.
The main points of review are as follows:
The production team needs to know how to record delays, including weekends, maintenance breaks, and scheduling changes--and if the dirty hold time is exceeded. If this happens, the incident must be evaluated according to the site’s deviation procedure or quality system. The equipment should not simply be cleaned and returned to use without assessing the effects and implementing necessary extra controls.
Any changes in product, cleaning agent, equipment configuration, process parameters or storage conditions may affect the removal of residues and must be evaluated in terms of change control. Regular checking of cleaning performance and deviation patterns is another approach that may help to determine if the established dirty hold time is still relevant.
In the pharmaceutical production process, the distinction matters because residue from the product can dry out, solidify, oxidize, degrade, or serve other purposes before the equipment has a chance to be used. A procedure may work just fine after the production process while it might not work after some time.
The Need for Scientific Evidence Supporting Dirty Hold Time
The properties of residues change depending on the time and environmental conditions. Water-based residues can get dried on the contact surfaces, whereas materials that are oily and sticky with high potency or in solid form may stick on the processing equipment. Moreover, certain residues may get extremely difficult to remove after a long time of exposure to air or change of temperature.The danger does not apply only to chemical residues. Processing machines with residues of moisture and product can serve as a medium for microorganism growth if the conditions are right. This point is essential for production with respect to products active to microorganisms, processes carried out with water, and equipment engaged in processes of microbiological nature.
The EC provided by the EU GMP in its Annex 15 highlights that particular concern should be presented with regard to the time between manufacture and cleaning of the item, as well as between cleaning and its use. The FDA also mentioned the importance of controlling time between the end of the process and its cleaning while administering the procedures of cleaning validation inspection.
Designing a Study That Represents Routine Manufacturing
The study methodology must be approved in advance of the study and must outline the goal, equipment involved, the product or residue used, the storage condition, sampling plan, testing methods, acceptance requirements, and responsibilities.Select a justified worst-case product and equipment
The chosen product should create an effective cleaning problem in relevant aspects such as solubility, strength, toxicity, ability to remain after cleaning, viscosity, drying, and efficiency of the previously used cleaning method.When it comes to the equipment choice, it shouldn’t be based on the fact that the steel surface is easy to handle. A task performed on such a surface may no represent a vessel outlet, transfer line, discharge valve, gasket, agitating rod, and any other difficult to clean spot.
If a certain family of products or a group of equipment is used, there should be a scientific reason for this choice. Simply stating that the size of the equipment or product category is the only criterion is not enough.
Define the holding period and conditions
It is necessary for protocols to provide details on how initiate dirty holding period, what is the predetermined or planned duration of holding period, and what is the criteria based upon which equipment will remain dirty or uncleaned (for example: being kept at a certain temperature, humidity, equipment configuration, residual moisture, being covered or being exposed, etc.)The selection of the planned duration should mean maximum delay for each concern which would be considered as the time that routinely occurs for operations.
There is no single period for dirty hold time which applies to all processes in the pharmaceutical sector,. No specific time such 24, 48, or 72 hours should be set with no justified reason for chosen time considering particular equipment, cleaning method and operation.
Creating procedure allows dirty equipment for variable time periods, it should challenge determined maximum under representative/usually conservative conditions.
Sampling and Testing at the End of the Hold Period
Testing should occur after the specified dirty hold duration and upon cleaning commencement. The goal is to check the residue situation and say whether the allowed cleaning method is still usable after the time lapse.Direct surface sampling, generally, swabbing, is good for locations where residues can reside or dry. Rinse sampling may be adequate for larger surfaces or machines when there is no direct access but the rinse technique suits the target residue recovery. The sampling method should be valid based on the device construction and the research aim.
The analytical technique should be adequate for the target residue and be able to analyze samples for the specified acceptance limit. The recovery studies have to show that the sampling and analytical methods can recover the residue from the target surfaces.
Depending on the particular product and the cleaning process used, testing may involve:
- The testing of an active substance or product residues with the proper specific test.
- Checking for detergent residue wherever necessary by the cleaning validation plan.
- Testing for microbiological contamination or other appropriate markers.
- Visual inspection for any visible residue to confirm the absence of it rather than replacing the proper analytical testing of the product.
A negative result does not mean that there is no residue in the tested environment. The result only indicates that the method used did not identify substance above its quantifiable level in the tested sample.
Acceptance Criteria and Interpretation of Results
The pre-determined acceptance criteria should be based on scientific data. They must correspond to the principal target of the experiment performed and relate to the documented cleaning validation plan. The limit for chemical residue must take into consideration the applicable product and patient safety risks, while the microbiological criteria must be adequate to the item under investigation and relevant process risk.The main question is whether the accepted cleaning process is capable of eliminating residues to the required degree, as described in the protocol after the specified dirty holding period of time. The study must be based neither on random residue level drop nor on visual cleanliness only.
In a situation where a manufacturing vessel has dry residues after a significant delay in between cleaning cycles, if the next cleaning run comes up to the residue criteria outlined in the documentation, the findings will justify the possibility of that hold time. However, in case the acceptance limit for residues is breached at least at one location, this study will not be considered as sufficient proof of good cleaning condition. The project team must investigate this outcome instead of simply ignoring it instead of saying other samples proved proper cleaning.
The protocol must clearly state how any unexpected results, deviations, or failures of acceptance criteria will be dealt with. Any repeated testing must be scientifically substantiated and registered. Repeating cleaning or resampling until satisfactory results are achieved cannot be used to hide the failure condition.
What QA and Validation Teams Should Verify
Prior to signing off on the study report, QA and Validation must ensure that the study has been done in compliance with the approved protocol and that the evidence supports the maximum dirty holding time proposed.The main points of review are as follows:
- The chosen product and equipment are justified as representative or worst-case.
- The actual holding conditions and time are documented and auditable.
- The equipment of sampling involves the necessary hard-to-clean areas.
- The methodology and recovery data observed obey the results interpretation rules.
- Each and every outcome, including failures and surprises, are analyzed.
- Each deviation has been accurately studied and its importance in relation to the conclusion of the study has been assessed.
- The proposed holding time must be stated in the report and reflected in the relevant SOPs or equipment operation instructions.
Establishing and Maintaining the Approved Limit
Once the study indicates a specific dirty hold time, it must be put into effect as part of standard operating procedures. The cleaning standard operating procedure, equipment history, batch records, or electronic interface must contain the stated time frame and enable personnel to note when operations stop and cleaning starts.The production team needs to know how to record delays, including weekends, maintenance breaks, and scheduling changes--and if the dirty hold time is exceeded. If this happens, the incident must be evaluated according to the site’s deviation procedure or quality system. The equipment should not simply be cleaned and returned to use without assessing the effects and implementing necessary extra controls.
Any changes in product, cleaning agent, equipment configuration, process parameters or storage conditions may affect the removal of residues and must be evaluated in terms of change control. Regular checking of cleaning performance and deviation patterns is another approach that may help to determine if the established dirty hold time is still relevant.
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