Your doctor may suggest you try the combination therapy of T3/T4 medicine if T4 medicine is not controlling your symptoms. If your dose of thyroid hormone is too high, you may develop complications such as irregular heartbeats and, over time, osteoporosis. If you have heart disease, too much medicine can cause pain (angina) and irregular heartbeats. Your doctor will watch your thyroid levels using a thyroid-stimulating hormone (TSH) test.
Metric System: The metric system is an internationally agreed decimal system of measurement created in France in 1799. The International System of Units (SI), the official system of measurement in almost every country in the world, is based upon the metric system. In the metric system, each basic type of measurement (length, weight, capacity) has one basic unit of measure (meter, gram, liter).
The metric system, also known as the SystÃ¨me international d'unitÃ©s (SI), was developed in the late 1700s to standardize units of measurement in Europe. The metric system is the primary system of measurement used through much of the world and in science. Each type of measurement has a base unit to which prefixes are added to indicate multiples of ten. Scientific notation is a shorthand for writing very small and very large numbers.