IRCT20200929048885N1 IRCT 2020-10-19 Shaheed Rajaie Cardiovascular, Medical & Research Center The Effect of Heparin Concentration of 1000 units per ml in Blood Samples on the Results of Venous Blood Gases intensive care unit patients The Effect of Heparin Concentration of 1000 units per ml in Blood Samples on the Results of Venous Blood Gases intensive care unit patients 2020-10-11 anticipated 141 Complete https://irct.ir/trial/51306 interventional Randomization: Not randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Blinding description: First, all participants will be explained how to implement the project. The syringes will then be placed in two groups of heparin 1000 units (heparinized syringes with 1000 units) and heparin 5000 units (the common method of heparinized syringes with heparin is 5000 units). An equal number of insulin syringes will be heparinized by the researcher in one group (A) with 1000 units of heparin solution (0.05 cc) and the other group (B) with 5000 units of heparin with the same amount (0.05 cc). They will be divided equally by the researcher (0.5 cc or 50 units per syringe) into two insulin syringes heparinized with codes A (heparin 1000 units) and B (heparin 5000 units) that only the researcher knew about. It is then placed on ice and sent to the laboratory within 10 minutes, along with a test sheet that lists the necessary parameters (patient biography, body temperature, hemoglobin level, oxygen intake). A laboratory that does not know the amount of heparin in the syringes is given to the analyzer. N/A heparin soduim. Intervention 1: Intervention group: Dilute an equal number of insulin syringes in a group (intervention group) with 1000 units of heparin solution (to prepare 1000 units of heparin, dilute one ampoule of 5000 units of heparin with 4 cc of distilled water in a 5 cc syringe and its volume To 5 cc, each cc equal to 1000 units), heparinized to 0.1 cc. Intervention 2: Control group: In the control group, based on the current situation, an ampoule of 5000 units of 0.1 ml of heparin was used to impregnate the insulin syringes used for blood sampling to test venous blood gases. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is I need to consult with other members of the research team to publish it