Presumptive test
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In medical and forensic science, a presumptive test is an analysis of a sample which establishes either:
- The sample is definitely not a certain substance
- The sample probably is the substance.
For example, the Kastle-Meyer test will show that a sample is not blood, or that the sample is probably blood (but it may be one of a range of less common substances). Further chemical testing is required to prove that the substance is blood.
In medicine, a presumptive diagnosis identifies the likely condition a patient has.
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