To document the total daily amount of liquid medication using the metric system, we need to convert teaspoons to milliliters, which is the standard unit of volume in the metric system.
One teaspoon is equal to approximately 5 milliliters, so three teaspoons would be equal to 15 milliliters.
If the patient is taking 15 milliliters every four hours, then they would be taking the medication 6 times a day (24 hours divided by 4 hours per dose).
Therefore, the total daily amount of the medication would be:
15 milliliters per dose x 6 doses per day = 90 milliliters per day
So, the total daily amount of the liquid medication should be documented as 90 milliliters per day in the patient's medical records using the metric system.