Needle Angles: Standard medication doses for adults are to be rounded to the nearest tenth (0.1) of a milliliter. The standard 3-mL syringe is calibrated in tenths of a milliliter. The nurse should not administer more than 3 mL per intramuscular or subcutaneous injection site; when a volume greater than 3 mL is required, a 5-mL syringe, calibrated in fifths, may be used.
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Prothrombin Time is used to measure how long it takes for the blood to clot. It can also be called as INR which stands for International Normalized Ratio. The INR is used to standardize the result of PT no matter what the testing method is. If PT is more than 2.5 times the controlled value or when the INR is more than 4.0, the person tested is in high risk for bleeding.