Wiener Lab CM250 or HumaStar 300SR - which clinical chemistry system to choose?

The choice between the HumaStar 300SR and Wiener Lab CM250 clinical chemistry analyzers depends on many factors and the specific needs of your laboratory. To determine which choice is more appropriate for your situation, it is important to consider the following critical aspects:

Company HUMAN Wiener Lab
Model HumaStar 300SR CM250
Throughput max. tests/h 300 230
Reagent positions 40 48
Reagent cooling 13°C below RT up to 12ºC below Room Temperature
Sample positions 60 48
Sample barcode reader Internal Internal
Cuvettes 80 re-usable Bionex 80 washable cuvettes
Water consumption (l/h) < 3 < 1

*All information is correct as of December 2023



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Throughput efficiency

Efficiency is critical for clinical chemistry analyzers in laboratories that manage varying sample volumes. In high-volume environments, choosing a high-throughput analyzer is essential to meet the specific needs of the laboratory without creating bottlenecks or underutilization. In high-throughput environments, the ability to process numerous tests in a given time frame is essential for overall efficiency and timely reporting of results.

  • HumaStar 300SR: With a robust maximum throughput of 300 tests per hour, the HumaStar 300SR excels in high-volume testing environments.
  • Wiener Lab CM250: Offers a maximum throughput of 230 tests per hour, suitable for laboratories with moderate sample volumes.

Reagent Positions

The availability of reagent positions plays a critical role in supporting laboratories performing a wide variety of tests. An increased number of positions not only allows for greater testing flexibility, but also reduces the need for frequent reagent changes. This feature is particularly important for laboratories seeking efficiency and versatility in their testing processes. A higher number of reagent positions allows laboratories to run a wide range of tests without frequent reagent changes, improving workflow efficiency and minimizing errors associated with reagent changes.

  • HumaStar 300SR: With 40 reagent positions, the HumaStar 300SR offers the versatility to perform a wide range of tests, minimizing the need for frequent reagent changes.
  • Wiener Lab CM250: Equipped with 48 reagent positions, offering additional flexibility in managing a wide range of tests.

Reagent cooling

Reagent stability is fundamental to the accuracy of clinical tests, and the use of reagent cooling mechanisms is essential, especially for tests that are sensitive to temperature fluctuations. Maintaining reagents within specific temperature ranges ensures their integrity, contributing to accurate and reliable test results. Temperature-sensitive tests common in clinical chemistry require stable reagents for accurate and reliable results. Reagent cooling is a critical feature that ensures optimal temperatures are maintained, preserving reagent integrity throughout the testing process.

  • HumaStar 300SR: Maintains stable reagent temperatures at 13°C below room temperature, providing an optimal environment for maintaining reagent integrity.
  • Wiener Lab CM250: Incorporates reagent cooling that maintains temperatures up to 12ºC below room temperature for stable reagent conditions.

Sample Positioning

Strategic sample positioning is essential for laboratories managing fluctuating sample volumes, and ensuring an adequate number of sample positions is critical to efficiently process all patient samples, mitigate the risk of sample backlogs, and maintain operational fluidity. Ensuring an adequate number of sample positions is critical to preventing bottlenecks in the testing process, especially for laboratories that handle fluctuating sample volumes. Efficient sample positioning not only reduces the risk of backlogs, but also improves the overall workflow for timely and accurate testing.

  • HumaStar 300SR: With a sample capacity of 60 positions, the HumaStar 300SR is well suited for laboratories managing higher sample volumes.
  • Wiener Lab CM250: Offers 48 sample positions, providing efficiency for laboratories with moderate sample volumes.

Sample Barcode Readers

Increasing the integrity of the testing process is achieved through the integration of specimen barcode readers. These readers reduce the risk of specimen mix-ups and ensure that results are accurately linked to the appropriate patients. This feature is especially critical for high-volume clinical laboratories, as it increases overall testing accuracy and reliability. In high-throughput laboratories, integrating specimen bar code readers is a key strategy for minimizing the risk of errors. By accurately linking results to their corresponding patients, barcode readers contribute to the overall reliability and integrity of the testing process.

  • HumaStar 300SR: Equipped with an internal sample barcode reader, increasing the accuracy of sample identification.
  • Wiener Lab CM250: Features an internal sample barcode reader, adding an extra layer of accuracy and traceability to the testing process.


The type and capacity of cuvettes used in clinical chemistry analyzers have a significant impact on consumable costs, the number of tests performed before cuvette replacement, and the overall environmental footprint. A nuanced understanding of cuvette configuration is critical to making informed decisions that balance cost effectiveness and operational efficiency. Cuvette selection has a direct impact on the operating costs and environmental impact of laboratory practices. Choosing reusable cuvettes over disposables not only reduces consumable costs, but also minimizes waste. A well-thought-out cuvette configuration contributes to a more sustainable and cost-effective laboratory operation.

  • HumaStar 300SR: Utilizes 80 Bionex reusable cuvettes, contributing to increased cuvette capacity and cost-effective operation.
  • Wiener Lab CM250: Uses 80 washable cuvettes, providing an alternative cuvette type with potential cost considerations.

Water Consumption

Monitoring water consumption is emerging as a key aspect of responsible laboratory management. Controlling operating costs and minimizing environmental impact are achieved through strategies that reduce water consumption. Implementing measures to reduce water consumption not only results in cost savings, but also aligns with the laboratory's sustainability efforts and contributes to a more environmentally conscious operation. Reducing water consumption is a proactive measure in laboratory sustainability that contributes to cost savings and environmental protection. It aligns with broader efforts to create greener laboratory practices and supports a responsible approach to resource management.

  • HumaStar 300SR: Boasts a lower water consumption rate of less than 3 liters per hour, contributing to cost efficiency and environmental sustainability.
  • Wiener Lab CM250: Demonstrates a low water consumption rate of less than 1 liter per hour, further improving operational cost efficiency.


  • HumaStar 300SR: Recognized for its high sample capacity, cost-effective use of Bionex reusable cuvettes, and focus on environmental sustainability.
  • Wiener Lab CM250: Offers additional reagent positions and lower water consumption, providing a balance of flexibility and cost-effectiveness.

In summary, the choice between the HumaStar 300SR and the Wiener Lab CM250 should be based on the specific priorities and needs of your laboratory. Considerations include test volume, the range of tests required, water consumption, and the importance of features such as reagent positions and cuvette types in your testing processes. The additional information provides insight into the specific strengths of each analyzer, allowing you to make an informed decision based on your laboratory's unique needs.