SOP on Viable Particle Monitoring of Drain Points– Sterile Product Manufacturing Facility


To lay down the procedure for Viable Particulate Monitoring of Drain Points – Sterile Product Manufacturing Facility


This SOP is applicable for Viable Particle Monitoring of Drain Points – Sterile Product Manufacturing Facility


Officer or above of Microbiology Laboratory.

Head – Microbiology section / Nominee.


Head – Quality Control / Nominee.

Head – Quality Assurance.


Viable particle monitoring of drain points in sterile product manufacturing facility shall be performed by microbiologist.

Perform the viable particle monitoring drain points in sterile product manufacturing facility by surface swabbing method.

Preparation of plates and other accessories

Prepare and sterilize required number of SCDA (Soya bean Casein Digest agar Medium plates and pre-incubate as per SOP on Preparation of sterile media.

Sterilize required number of tubes containing 10 ml of saline and a swab and place them in test tube stand.

Sterilize required number of SS carriers.

Place the test tube stands in the carriers.

Carry SS carriers to the facility to be monitored by following plant entry procedure.

Take out the items from the SS bin and start the monitoring using the procedures mentioned below.

Swab method:

Aseptically open the test tube containing swab and take out the sterile swab partially, press the swab to the internal walls of the tube gently to remove excess saline and take out completely.

Swab about 25 cm2 area in the direction specified in Figure: 1

Place the swab in the saline containing tube and close.

After completion of test label each plate on bottom side with location code, shift and date.

Perform the sampling in all the locations using same procedure.

Place all the swab tubes and place the stands in SS carriers.

After complete sampling, bring all the medium swab tube carriers to microbiology laboratory for analysis.

Perform the testing of swabs, in MLT testing room.

First, vortex the solution (saline) contained in each tube along with swab and filter through a sterile 0.45 µm membrane filter and rinse the membrane filter with 100 ml  X 3 of 0.1% peptone water and place the membrane filter on pre-incubated SCDA medium plate. Use different filter holder for each swab.

Incubate the plates at 20-25 0C for 72 hours and at 30-35 0C for further 48 hours. Observe the plates after 72 hours and after further 48 hours and record the results.

A -


Once in a Month

Acceptable levels

Verify that the monitoring results are with in the acceptable levels mentioned in the            particular annexure.

List of Annexure :

S. No.  Annexure TitleAnnexure  Number
01Report of Viable Particles Monitoring Drain points


References (if any).

Not Applicable

Reason for Revision

New SOPs


QC: Quality Control

SOP: Standard Operating Procedure

End of SOP


Annexure – I

Report of Viable Particles Monitoring Drain points

FacilitySterile Product


AreasAdjacent to Sterile filling Areas
Medium usedA.R.No
Medium Lot.NoSample Size25 cm2
Time of TestFromTested on
ToReported on
Incubation Temperature                     PeriodIncubator I.D.No.
20-25°CFrom:                             To:
30-35°CFrom:                             To:



Code for plate



Total Viable Count(CFU’s/Location)
After 72 hrsAfter further 48 hrsTotal viable count after 5 Days





Garment Washing Room(Drain Point-1)AS-DP01
Washing and Sterilization Room Drain Point-II)AS-DP02
Bung Processor cum Sterilizer

(Drain Point-III)

Equipment washing and Sterilization room (Drain Point III)AS-DP04
Observation done by
Date of observation

Legend: AS-DP: Adjacent to sterile Filling Areas-Drain Point

Interpretation: The viable particle counts of drain points tested by swab test are within /not within the acceptable levels.

Acceptable level of Total Viable Count (CFU/Location):100 CFU’s


Performed By/Date                Checked By/Date:                  Reviewed By/Date:


About Pharmaceutical Guidanace

Ms. Abha Maurya is the Author and founder of pharmaceutical guidance, he is a pharmaceutical Professional from India having more than 18 years of rich experience in pharmaceutical field. During his career, he work in quality assurance department with multinational company’s i.e Zydus Cadila Ltd, Unichem Laboratories Ltd, Indoco remedies Ltd, Panacea Biotec Ltd, Nectar life Science Ltd. During his experience, he face may regulatory Audit i.e. USFDA, MHRA, ANVISA, MCC, TGA, EU –GMP, WHO –Geneva, ISO 9001-2008 and many ROW Regularities Audit i.e.Uganda,Kenya, Tanzania, Zimbabwe. He is currently leading a regulatory pharmaceutical company as a head Quality. You can join him by Email, Facebook, Google+, Twitter and YouTube

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