NABL Accredited · ISO/IEC 17025:2017

Sterility Testing Laboratory India | NABL Accredited Pharmaceutical Microbiology

Comprehensive sterility testing and pharmaceutical microbiology services from an NABL-accredited laboratory in India.

Sterility testing is a non-negotiable quality requirement for every injectable, ophthalmic, and inhalation pharmaceutical product released to market. Auriga Research operates an NABL-accredited pharmaceutical microbiology laboratory equipped with cleanroom-grade aseptic testing suites, validated growth media preparation, and rigorous environmental controls to deliver sterility testing results that regulatory authorities trust. Our microbiological testing services cover the complete spectrum of pharmacopoeial requirements — from sterility testing per USP <71> to microbial limit testing, bacterial endotoxin testing, and environmental monitoring programmes.

Our sterility testing methods include both membrane filtration and direct inoculation techniques, selected based on product characteristics, volume, and antimicrobial properties. Every test batch undergoes validated bacteriostasis and fungistasis suitability testing to confirm that residual product does not suppress microbial growth in culture media. Positive and negative controls are run with every test session, and all media batches are growth-promotion tested before use — ensuring that every sterility test result is scientifically defensible and audit-ready.

Beyond sterility testing, our pharmaceutical microbiology laboratory provides microbial limit testing (bioburden) per USP <61>/<62> for non-sterile products, bacterial endotoxin testing (LAL) per USP <85>, environmental monitoring for manufacturing facilities, preservative effectiveness testing per USP <51>, and microbial identification by MALDI-TOF mass spectrometry and 16S rRNA gene sequencing. All testing is conducted under our ISO/IEC 17025:2017 quality management system with full data integrity and traceability.

Sterility Testing & Microbiology Capabilities

  • Sterility testing per USP <71> / EP 2.6.1 — membrane filtration and direct inoculation
  • Microbial limit testing (TAMC, TYMC) per USP <61>/<62> and Indian Pharmacopoeia
  • Bacterial endotoxin testing (LAL) per USP <85> — gel-clot, kinetic turbidimetric, kinetic chromogenic
  • Environmental monitoring — viable air sampling, surface contact plates, settle plates
  • Preservative effectiveness testing per USP <51> / EP 5.1.3
  • Microbial identification by MALDI-TOF and 16S/18S rRNA sequencing
  • Water for pharmaceutical use microbiology per USP <1231>
  • Specified organism testing — E. coli, Salmonella, S. aureus, P. aeruginosa, Clostridia
  • Growth promotion, bacteriostasis/fungistasis suitability testing

Turnaround Time

Sterility Testing: 17-21 business days (14-day incubation per USP <71>)
Microbial Limits (Bioburden): 5-7 business days
Endotoxin Testing (LAL): 2-3 business days
Environmental Monitoring: 7-10 business days
Microbial Identification: 5-10 business days
Preservative Effectiveness: 28 business days

Who Needs Microbiological Testing

  • ✓ Manufacturers of sterile injectables, ophthalmic, and inhalation products requiring batch release sterility testing
  • ✓ Non-sterile pharmaceutical manufacturers needing microbial limit testing for oral and topical dosage forms
  • ✓ Pharmaceutical water system operators requiring routine WFI and purified water microbiology monitoring
  • ✓ Contract manufacturers and CROs requiring third-party NABL-accredited microbiological testing
  • ✓ Facility qualification teams needing environmental monitoring programme design and execution

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Frequently Asked Questions — Sterility Testing & Pharmaceutical Microbiology

What is sterility testing and why is it required?
Sterility testing is a compendial microbiological test performed per USP <71> and EP 2.6.1 to confirm the absence of viable microorganisms in pharmaceutical products that must be sterile — including injectables, ophthalmic preparations, and inhalation products. It is a regulatory requirement for batch release of all terminally sterilised and aseptically processed products. The test uses membrane filtration or direct inoculation into fluid thioglycollate medium (FTM) and soybean-casein digest broth (SCDB), incubated for 14 days at 30-35 C and 20-25 C respectively.
What are the main sterility testing methods used in pharmaceutical microbiology?
The two primary sterility testing methods are membrane filtration and direct inoculation. Membrane filtration is the preferred method for most products — the sample is passed through a 0.45 micron membrane that retains microorganisms, and the membrane is transferred to growth media. Direct inoculation involves adding the product directly to culture media and is used for small-volume products, turbid preparations, or samples with antimicrobial properties that cannot be adequately rinsed. Both methods require validated bacteriostasis/fungistasis testing to confirm that residual product does not inhibit microbial growth.
What is microbial limit testing and how does it differ from sterility testing?
Microbial limit testing (MLT) per USP <61>/<62> quantifies the bioburden — total aerobic microbial count (TAMC) and total yeast/mould count (TYMC) — in non-sterile pharmaceutical products, and screens for specified objectionable organisms such as E. coli, Salmonella, Staphylococcus aureus, and Pseudomonas aeruginosa. Unlike sterility testing which is a pass/fail test for sterile products, MLT is a quantitative enumeration test with acceptance criteria based on dosage form and route of administration. MLT applies to oral solid, liquid, and topical pharmaceutical products.
What is bacterial endotoxin testing and when is it needed?
Bacterial endotoxin testing (BET), also called the LAL test, detects and quantifies endotoxins (lipopolysaccharides from Gram-negative bacteria) per USP <85> and EP 2.6.14. Endotoxins cause fever and potentially fatal septic shock in patients even when the product is sterile. BET is mandatory for all parenteral drugs, biologics, medical devices with patient contact, and water for injection (WFI). Auriga Research performs kinetic turbidimetric, kinetic chromogenic, and gel-clot LAL methods with sensitivity down to 0.005 EU/mL.
How long does pharmaceutical microbiological testing take?
Turnaround times vary by test type. Sterility testing requires a minimum 14-day incubation period per USP <71>, with the full report available within 17-21 business days. Microbial limit testing (bioburden) typically takes 5-7 business days. Bacterial endotoxin testing results are available within 2-3 business days. Environmental monitoring reports are delivered within 7-10 business days. Microbial identification by MALDI-TOF or 16S rRNA sequencing takes 5-10 business days depending on the organism complexity.

Need Sterility Testing or Microbiology Services?

NABL-accredited sterility testing with 14-day USP <71> compliance. Regulatory-ready reports for CDSCO and international submissions.

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