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Merck Manual

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Weights and Measures

In medicine, precise measurements are necessary—for example, when various substances are measured in laboratory tests to evaluate health or make a diagnosis. Different units of measure may be used depending on the substance. Usually, the metric system, based on multiples of 10, is used to measure the following:
- Weights and Measures
Common Medical Tests

A large number of tests are widely available. Many tests are specialized for a particular disorder or group of related disorders (which are usually described with the appropriate disorders in this book). Other tests are commonly used for a wide range of disorders.
- Common Medical Tests
  - Types of Tests
  - Risks and Results
Anatomical Drawings

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