Özet

Methods: Invoices, labor, material costs were calculated with micro-costing method, while general production expenses were calculated with gross costing method between January 2018 and December 2019. Unit costs for each blood product were calculated separately by collecting unit acquisition costs, material costs, labor costs, and general production expenses and, then, distributed into six different blood products as follows: erythrocyte suspension, fresh frozen plasma, pooled platelet, apheresis platelet, cryoprecipitate, fresh whole blood. The total costs for 2018 and 2019 were calculated and the savings achieved were estimated. The Turkish Lira was converted into the United States Dollar ($) currency using the purchasing power parity.

Results: In 2018/2019, the blood component transfusion cost was $240.90/251.18 for erythrocyte suspension, $120.00/128.67 for fresh frozen plasma, $313.50/322.19 for pooled platelet, $314.24/325.73 for apheresis platelet, $104.95/113.99 for cryoprecipitate, and $189.91/209.09 for fresh whole blood. The total transfusion cost was $6,224,208.33 in 2108 and $5,308,148.43 in 2019. As a result of the transfusion improvement program launched in 2019, the amount of blood components decreased by 23.24%, compared to the previous year, and a saving of $916,059.9 was achieved.

Conclusion: The transfusion is a burden for both the hospital management systems and the country's economy. To accurately calculate and manage this economic burden is important for sustainable healthcare services.

Allogeneic blood transfusion causes variable costs according to different applications in treatment expenditures.[5] It imposes an economic burden to purchase, test and prepare the component suitable for transfusion, deliver blood components to relevant clinics, apply to the recipient, monitor, treat transfusion-induced reactions, disposal of it as medical waste, and file all mandatory information.

Hospitals are not standard manufacturing companies; therefore, the cost calculation of hospitals involves more complex processes. In a cost analysis study, the spectrum is among the bottom-up (micro-costing) and the top-down (gross costing) approach.[6] Each component of resources used in the micro-costing method (such as laboratory tests, medications, or labor hours) is determined and the unit cost is derived from each. It is a frequently used method to calculate the costs more precisely where there is an inventory of all resources used. However, there is no single micro-costing methodology. The methodology used may differ depending on the data set and the objective of the study. The data collected in this context can include administrative data sets, patient charts, hospital accounting systems, or direct observation results.[7] A hybrid model including micro-costing and gross costing methods can also be used in cost calculations.[6]

It is a complex process to calculate the cost of the blood transfusion process, regardless of which costing method is used. To calculate the exact cost of the transfusion process, it is first necessary to know the transfusion cost of the "1 Unit" blood component. In this study, we aimed to analyze the cost of the entire transfusion process in Turkey including evaluation of the cost of transfusion from the perspective of hospital management and determination of saving achieved as a result of the improved transfusion process efforts.

Yöntem

In our center, thoracic surgery and oncological colorectal surgery are performed along with surgical and medical cardiovascular interventions. The hospital has a closed area of 41,249 m2 and the transfusion center has an area of 450 m2. While 22,444 patients were hospitalized in 2018, a total of 4,616 surgeries and 24,495 catheters were performed, and emergency service was provided to 69,288 patients. In 2019, 22,270 patients were hospitalized, a total of 5,123 operations, 20,413 catheters were performed, and emergency service was provided to 72,193 patients.[8]

Each main process was defined along the transfusion chain, the frequency and utilization characteristics of these processes were determined, the sub-activities of each main step were established, and the time required for these activities was calculated. The unit cost of each blood component was calculated by adding up the material cost, labor cost, and general production cost caused by each activity. The currency of Turkish Lira (") was converted to United States (US) Dollars ($) using purchasing power parities; i.e., rates of currency conversion eliminating price differences between countries. As a result, a sum of money would have the same buying power in each country. Exchange rates declared by the Organisation for Economic Co-operation and Development (OECD) for 2018 and 2019 years were used in this conversion. A retrospective hybrid model was used, where labor and material costs were calculated by micro-costing and general production costs by gross costing. The calculation methods of these costs were based on the following four items:

1. Acquisition cost: There is no purchase cost for the blood component as only fresh whole blood from the Turkish Red Crescent is prepared in the hospital. For other blood components, a fee is paid to the Red Crescent by the hospital according to the amount of the components (delivered or used).

2. Material cost: The added material is calculated by adding the tests and process costs, making any of the components ready for transfusion over the cost of obtaining the supplied component.

3. Labor cost: During the blood transfusion process, six different personnel are employed, namely nurse, perfusionist, clinician doctor, co-doctor, and porter. The total time each staff participated in the transfusion process is calculated on average by observation and labor costs per min are estimated.

4. General production cost: The general production costs for each blood component include municipal water, fuel and electricity consumption, computer service purchase fee, telephone subscription fees, information subscription, and internet access fees, computer service purchase expenses, insurance expenses, medical waste, disposal and shipping service expense, archive rental expense, and depreciation expense.

The one-year total cost obtained from the hospital accounting information system was first assigned to the transfusion center and, then, to six different blood components processed in the transfusion center. Electricity, water, and fuel expenses are distributed based on the per m²; computer service purchase expense, telephone subscription fee, information and internet access fee, insurance expense, archive leasing expense were distributed based on the total number of staff working in the blood center (10 employees). Inventory depreciation expense was calculated as 20% of the monetary value of inventory in accordance with the notification of the General Directorate of Accounting of Turkey.[9] Healthcare c enters pay a fee for medical waste management with a varying cost per kg of the medical waste. Therefore, the amount of medical waste generated by the blood center in one year was proportioned to the total medical waste amount (kg) of the hospital for one year and this rate was applied to the expense (") of the total medical waste disposal and transportation service.

After the total production costs of the blood center were calculated in this way, general production costs (variable costs such as electricity, water, maintenance and repair, medical waste disposal and transportation service and depreciation costs) were distributed according to the ratio of six different blood components in the total number of transactions. Since fuel, computer service purchase, telephone, information and internet access, insurance and archive rental expenses were independent of production amount, they were distributed equally to these six different blood components. Unit costs for each blood component for 2018 and 2019 were calculated separately by collecting unit acquisition costs, material costs, labor costs, and general production expenses.

Bulgular

Table 1: Procurement and raw material costs ($)

The FWB donation was done in our center. Other blood components fees underwent additional tests and processes for transfusion. There was no change in the fees paid to Turkish Red Crescent in 2018 and 2019. The highest supply cost for both years was in the PT and AP.

The time and labor expenses involved in the performance of each activity in the transfusion chain are shown in Table 2. The cost per min of each staff was calculated by dividing the annual total wages by the total working min per year. Approximately 20% of the daily work of the staff went through rest and breaks. Taking into account the total number of workdays and idle time in 2018 and 2019, total working times were calculated as 96,000 and 95,232 min, respectively.

During the transfusion process, staff were involved in six different roles. Costs per min were calculated (Table 2). Labor expenses were higher in the FWB and ES components, due to the long transfusion times.

Table 2: Labor time and expenses

The unit cost per share of blood components from the general production expenses to the transfusion center is shown in Table 3. The relatively low number of AP transfusions caused the unit general production costs to be higher than other blood components. Compared to 2018, the decrease in the number of transfusions of all blood products in 2019 caused the general production expense per unit product to be calculated higher.

Table 3: General production expenses (?)

Unit and total annual costs of each blood component calculated are shown in Table 4. While the highest blood transfusion unit cost was AP, ES was the highest total transfusion cost per year.

Table 4: Unit and annual total costs of blood component

The fact that the number of transfusions of the AP in a year was very low, compared to other components, it caused the unit cost to be charged from the fixed expenses to be high. The supply cost for 2019 was 53.89% of the total unit cost in FWB and ES, 33.44% in FFP, 73.16% of the PP, 62.81% of the AP, and 22.69% of the CRY. In 2018, similar rates were obtained. The number of blood components used in 2019 decreased by 23.24%, compared to 2018 with the implementation of the new blood management model, although the unit blood component costs increased, $916,059.90 (14.71%) were saved in the annual cost of all blood components. The reduction in components, number of patients, operations, and procedures are shown in Table 5.

Table 5: Change in the number of inpatients, catheters, procedures, surgery and blood components in 2018 and 2019

The distribution of items constituting the total unit cost of blood components did not differ significantly in 2018 and 2019 (Figure 1). While the most important part of the total cost (58.67% and 67.08%, respectively) in FFP and CRY were the labor costs, the AP had the highest general production expense ratio. The component with the highest ratio of direct material cost in total cost was PP.

Figure 1: Distribution of unit costs of blood components.
ES: Erythrocyte suspension; FFP: Fresh frozen plasma; PP: Pooled platelets; AP: Apheresis platelet; CRY: Cryoprecipitate; FWB: Fresh whole blood.

Tartışma

Transfusion process improvement work reduces the economic burden of blood transfusion. Hospitalization, medical care and drug costs, such as the annual cost of blood transfusion in Turkey are estimated as at least 100 million Dollars.[10]

Estimated the cost of blood transfusion in the Western Europe with six different study findings, taking into account direct costs, the average cost was set at 878 Euros (€).[11] Evaluating the full cost of blood transfusion in the United Kingdom National Health Service (NHS) with micro-costing, laboratory, nursing inputs, and waste were identified as three components of the total cost of blood management.[12] The average cost per transfused blood component was calculated as $70.52 for ES, $84.10 for PLT, $55.22 for FFP, and $71.58 for CRY. In another study conducted in England, the cost of annual blood transfusion to the NHS was £635 for ES, £378 for FFP, £347 for PP, and £834 for CRY. In our study, the cost was calculated as $251.18 for ES, $128.67 for FFP, $322.19 for PP, $325.73 for AP, $113.99 for CRY, and $209.09 for FWB. Although the calculation methods in these studies are similar, the difference in cost perspective and the factors included in the cost led to different unit costs. In most of the studies, procurement cost, labor cost, and material cost are common cost elements.[13,14]

An eight-stage costing model was created for the use of ES in Canada and personnel, material, and capital equipment costs were evaluated using activity-based costing principles at each stage of the transfusion. Unit ES total hospital cost was found to be $243,1. Labor cost was calculated as 77.5% and material cost as 19%.[15]

Another study using activity-based costs of blood transfusion in surgical patients reported the cost to be 3.2 to 4.8 times higher than the cost of blood procurement.[16] The average cost per patient was $219, with storage, testing, and other additional costs for blood components purchased an average of $155. About 37% of the total cost was the procurement cost, while 13% was the storage cost, 43% was the laboratory testing, and 7% was the blood management.[17]

In a study where the cost of plasma transfusion was calculated using an activity-based cost method, unit cost per FFP was found to be $409, while the unit cost per patient transferred was $1,608. Waste products, in-hospital processes, and overhead costs were found to account for 89% of total FFP transfusion costs.[18]

In this study, we determined that the cost of supply varies according to blood component which constituted approximately 22 to 73% of the total cost. Labor and general production expenses constituted 63% of the total cost in the unit cost of FFP. It is thought that the uncalculated cost of wasted components may play a lower role than other studies. Also, lower labor costs in other studies may have an impact on lower hospital costs. The average minimum wage in OECD countries in 2018 was $12,616 and $15,410 in Turkey.[19] In other studies, the cost of providing one unit of blood to the hospital is often higher than our study, which affects the overall cost to remain relatively low.

With the transfusion process improvement studies carried out in 2019, a decrease of 23.24% in the number of transfusions and a saving of approximately 15% ($916,059.90) in total transfusion cost was achieved, although the unit transfusion cost increased compared to 2018.

Failure to generalize the results obtained by performing the analysis on a certain population is an inherent limitation of the micro-costing method.[20] Conducting the study in a single-center is another limitation. However, the number of data, the number of patients, and the number of blood components used in this study are high. Future multi-center studies may yield more useful data in terms of generalizability of the calculated costs. The scope of this article is the cost issue only, as improving the transfusion process is a subject of another research and should be prepared specifically for each hospital.[21]

In conclusion, transfusion causes an economic burden for both the hospital management systems and the country. To accurately calculate and manage this economic burden, it is extremely important to identify the unit cost of each blood component. In this study, we calculated the cost of transfusions in Turkey. Further studies analyzing the calculated cost from a social perspective are needed to obtain more comprehensive results.

Declaration of conflicting interests
The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.

Funding
The authors received no financial support for the research and/or authorship of this article.

Kaynaklar

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