The practical value of Brucella Blood Agar w HEMIN AND VITAMIN K1 Culture Media is not the plate or broth alone; it is the reproducibility of the susceptibility endpoint produced from it. The discussion below connects its documented role with preparation variables, controls, interpretation, and the limits of inference. Catalogue 10245 is discussed as a laboratory measurement component; implementation should follow the laboratory SOP and validated reference method.
Analytical scope and method role
Medium for the isolation and subculture of anaerobes from clinical specimens. This medium is intended as an aid in the diagnosis, requiring further tests to complete the diagnostic results.
Method principle
Pancreatic digest of casein and peptic digest of animal tissue provide amino acids, nitrogen, carbon, minerals and vitamins essential for bacterial growth. Glucose is the fermentable carbohydrate. Yeast extract is a source of vitamins, particularly of group B. Sodium chloride maintains the osmotic balance of the medium. Sodium bisulfite lowers the redox potential to a range suitable for strict anaerobes. Hemin and vitamin K1 support the growth of certain fastidious anaerobes. Sheep blood provides additional nutrients and allows to detect hemolytic reactions. Agar is the solidifying agent.
Formula and functional interpretation
* Per Litre of Purified Water Pancreatic Digest of Casein 10.0 g Peptic Digest of Animal Tissue 10.0 g Glucose 1.0 g Yeast Extract 2.0 g Sodium chloride 5.0 g Sodium Bisulfite 0.1 g Vitamin K1 0.001 g Hemin 0.005 g Sheep Blood, defibrinated 50.0 ml Agar 15.0 g Final pH 7.2 ± 0.2 at 25°C *Adjusted and/or supplemented as required to meet
Review the nutritive, selective, differential, buffering, reducing, and indicator components against the expected target and background flora. Preparation errors can change recovery, inhibition, colour development, or endpoint visibility even when incubation is correct.
Preparation and execution: controlled method points
Preparation: of anaerobic specimens.
Procedure: Isolation Inoculate the medium by directly streaking the specimen on the agar surface to obtain well-isolated colonies. Incubate the plates in an inverted position at 35 ± 2°C for 24-72 hours in an anaerobic atmosphere. Note: Alternative incubation temperature and time may be required depending on the method used, type of specimen and the microorganism being tested. The user is responsible for choosing the appropriate incubation conditions. © Liofilchem - Brucella Blood Agar w Hemin and Vitamin K1 - Rev.0/ 06.07.2023 Page 2 of 10 Once the primary cultures are set up, it is recommended to also run the test using a selective medium (such as Schaedler Kanamycin-Vancomycin Agar with 5% Sheep Blood) and an aerobic medium (such as Columbia Agar with 5% Sheep Blood).
Translate the method into controlled worksheet fields: catalogue and lot, preparation mass or volume, water quality, pH where applicable, heating or sterilization, supplements, dispense volume, preparation date, expiry assignment, incubation atmosphere and temperature, reading window, equipment, and analyst. Record departures as deviations instead of silently normalizing them.
Quality control: what the control result protects
organisms, incubator, controlled atmosphere generators, jars. Other Reagents (Optional): Physiological solution (0.85% saline), MTSTM (MIC Test Strip). SPECIMENS Brucella Blood Agar w Hemin and Vitamin K1 can be used for the isolation and cultivation of strict anaerobes from all types of specimens. For antimicrobial susceptibility testing (AST) with gradient tests, the method requires the use of pure cultures. Refer to specific guidelines for information about collection, transport and
Challenge both sides of performance. Include a target reaction demonstrating recovery and, when relevant, a non-target or alternate reaction challenging inhibition or differentiation. Record expected and observed responses, acceptance criteria, strain and passage, lot, incubation, and disposition. A failed control blocks result interpretation until the cause is resolved.
Interpretation and confirmation pathway
After incubation, the plates are inspected for growth, also in comparison to the growth on the other media. Colonies which appear on this medium are suspected to be strict anaerobes if they do not grow on aerobically incubated blood agar plates. Note: further testing should be conducted to confirm the presumptive identification of organisms isolated on this medium. For how to read and interpret the MTS results consult appropriate guidance.
Record the raw observation before the conclusion: morphology or colour, growth pattern, endpoint, reaction intensity, reading time, and control response. Presumptive reactions remain presumptive. Route atypical, weak, mixed, or delayed reactions through the confirmation step in the current method.
Storage, stability, and pre-use inspection
Store at 2-8°C away from light. Do not use the product beyond its expiry date on the label or if product shows any evidence of contamination or any sign of deterioration. Avoid quick temperature shifts to prevent condensation.
Receipt and storage records should reconstruct temperature exposure, lot rotation, expiry, container integrity, and time outside controlled storage. Inspect colour, clarity, fill volume, gel integrity, contamination, dehydration, and precipitate before use.
Limitations and boundaries of use
Invalid results can be caused by poor specimen quality, improper sample collection, improper transportation, improper laboratory processing, or a limitation of the testing technology. The operator should understand the principles of the procedures, including its
Applicability depends on matrix, target organism, interfering flora, inoculum, validated method, and regulatory setting. Do not transfer conditions or acceptance criteria from a different matrix without verification.
Troubleshooting from evidence, not guesswork
- Poor recovery: check preparation, pH, overheating, supplement addition, inoculum, atmosphere, storage, and control performance.
- Loss of selectivity: review formulation, sterilization, expiry, inoculum burden, enrichment sequence, and incubation time.
- Weak or atypical reaction: confirm reading time and atmosphere, compare controls, document mixed growth, and follow confirmation requirements.
- Run-to-run drift: trend lot, analyst, equipment, water, preparation batch, controls, and environmental conditions.
External method context
The product should be understood as one measurement component in an antimicrobial susceptibility method. The analytical chain includes isolate purity, standardized inoculum, medium composition, antimicrobial concentration, incubation atmosphere and time, endpoint reading, and the interpretive table selected by the laboratory. A shift in any upstream variable can move an MIC or zone without a change in organism biology, which is why QC distributions and trend review are more informative than a single pass/fail control.
External laboratory-quality guidance also supports a lifecycle view: verify the method when introduced, bridge new lots against an accepted lot, trend control results, investigate nonconformities, and retain enough raw observations to reconstruct the decision. This is the practical difference between reproducing a preparation instruction and demonstrating that the resulting measurement is fit for its intended use.
EUCAST disk diffusion and quality control
EUCAST requires standardized methodology, current breakpoint tables, and routine quality control; the laboratory remains responsible for the final susceptibility report. For broth dilution, inoculum density, cation content, pH, incubation atmosphere, endpoint definition, and two-fold dilution design influence MIC reproducibility. Breakpoints are interpretive rules applied after a technically valid MIC or zone measurement; they are not properties of the product alone. Review the authoritative source.
FDA Bacteriological Analytical Manual
FDA BAM methods organize food microbiology around validated sampling, preparation, enrichment, isolation, and confirmation steps, with method applicability tied to the matrix and target organism. Sampling uncertainty, homogenization efficiency, inhibitory ingredients, dilution design, and countable range can dominate the result before the culture medium is ever inoculated; those variables belong in method verification and uncertainty review. Review the authoritative source.
WHO Laboratory Quality Management System handbook
WHO laboratory quality guidance treats document control, equipment, purchasing and inventory, process control, records, occurrence management, and continual improvement as connected parts of reliable testing. Review the authoritative source.
Technical references
- Manufacturer product documentation for catalogue 10245.
- EUCAST disk diffusion and quality control (access checked 2026-07-20).
- FDA Bacteriological Analytical Manual (access checked 2026-07-20).
- WHO Laboratory Quality Management System handbook (access checked 2026-07-20).
Bench-use checklist
- Verify product identity, catalogue number, lot, expiry, and storage history.
- Document preparation and incubation exactly as controlled in the SOP.
- Define controls and acceptance criteria before testing.
- Record raw observations, control response, reading time, and confirmation decision.
- Escalate failed controls, atypical reactions, and departures through the quality system.