ASCP Diplomate in Laboratory Management (DLM) 2025 – 400 Free Practice Questions to Pass the Exam

A variable cost is defined as a cost that changes in direct proportion to changes in the volume of services or products produced. In the context of a laboratory, supplies used in lab tests, such as reagents, chemicals, and consumables, are classic examples of variable costs. The amount spent on these supplies will vary depending on the number of tests conducted; as test volume increases, the consumption of these supplies also increases, leading to higher costs.

In contrast, lease payments for laboratory instruments, administrative support salaries, and facility maintenance fees are generally considered fixed costs. These costs remain constant regardless of the level of activity within the lab. For instance, lease payments must be made irrespective of how many tests are performed, and salaries are paid based on agreed-upon rates rather than varying with activity level. Facility maintenance fees similarly remain steady regardless of lab usage.

Choosing supplies used in lab tests as the variable cost effectively captures the relationship between operational activity and cost, emphasizing the dynamic nature of this expense in relation to lab workload.