Final answer:
For steroid testing, a minimum sample volume of 30 milliliters is typically required. This quantity ensures enough sample for all stages of the testing process.
Step-by-step explanation:
The volume of a sample required for steroid testing varies depending on the specific protocols of the lab conducting the test. In most cases, a minimum sample size of 30 milliliters (ml) is needed. This allows for sufficient quantity for both initial analysis and any potential retests to confirm the findings. Such a volume ensures that there is enough sample for the various analytic procedures involved in steroid detection, including preparation, separation, and identification of the steroids present.