They typically involve specific technological specifications

 They typically involve specific technological specifications and complicated manufacturing processes. Additionally, during pandemics, these kits are not produced as quickly. Human resources are limited due to disease burden, and protective clothing does not encourage efficiency. Furthermore, issues related to intellectual property may limit the development of such products. In the Netherlands, for example, Roche decided to reveal the contents of the lysis buffer after a public uproar 82.
Costs

The costs of a function diagnostic test kit vary widely. In epidemic  and endemic settings, it can be used in the triage of symptomatic individuals, differential diagnosis, and testing of patients who have had exposures to the disease. In a controlled or preventable  environment, it may be used for environmental monitoring or surveillance of an outbreak. But the most critical consideration is the effectiveness of the test. To make an informed decision, a function diagnostic test kit must meet several criteria.

The initial cost estimates for COVID-19 testing are difficult to determine, and the costs of developing new Triglyceride Assay Kit products and transforming production lines are directly impacted. There is also a risk of a loss of established products. The cost of a function diagnostic test kit may vary from $100 to $240, and prices within hospitals may be different. However, the costs associated with a COVID-19 test kit will vary based on the number of tests and laboratory, as well as where the sample collection takes place.
Real-life evaluations

Although some studies have reported that a diagnostic test kit is accurate and reliable, the actual performance of the test varies widely in real life. The size of the sample used in evaluation studies often affects the real-world performance of the diagnostic test. For example, if the sample size is larger than 250, only nine out of every ten positive test results are positive, reducing the risk of failing to meet desirable guidelines by 5%. Conversely, with a sample size of 160 and more negatives, the sensitivity and specificity still have a 10% chance of falling below desired guidelines.

As with most clinical trials, functional evaluations should be based on real-life patient data. It is essential to record the operational characteristics of a diagnostic test kit and its capabilities in the real world. For example, a test must be stable in high temperatures and humid conditions. The user-friendliness of the diagnostic test should be evaluated according to specific criteria for low-resource environments. Furthermore, the test kit should be easy to use and convenient to perform.