Lab Test

Blood Test

Learn about blood tests: purpose, types, preparation, and how to interpret results.

Overview

A blood test is a laboratory analysis of a blood sample to assess health status, diagnose conditions, or monitor treatments.

Blood tests can detect infections, nutrient deficiencies, organ function, cholesterol levels, blood sugar, and many other health markers.

A small blood sample is drawn from a vein, usually in the arm. The sample is sent to a laboratory for analysis.

Some blood tests require fasting for 8-12 hours. Your doctor will provide specific instructions.

Abnormal results may indicate infection, anemia, diabetes, kidney or liver problems, or other conditions requiring further investigation.

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