Which finding on a female student athlete's pre-participation examination would most likely impact her ability to begin training?

A hemoglobin level of 25% is critically low and indicates severe anemia, which can significantly impair an athlete's oxygen-carrying capacity, stamina, and overall physical performance. Hemoglobin is essential for transporting oxygen in the blood, and when levels drop this low, it can lead to fatigue, weakness, and increased risk for injury, as the body is unable to meet the demands of vigorous physical activity. This condition must be addressed before an athlete can safely begin or continue training, as it poses a serious risk to health and performance.

In contrast, a heart rate of 80 beats per minute is a normal resting heart rate for most individuals, suggesting that it would not adversely affect training capabilities. A body mass index of 22 falls within the normal range and is typically not a concern for athletic performance. Additionally, a blood pressure reading of 110/70 mmHg is considered healthy and would not interfere with the ability to train. Therefore, the hemoglobin level stands out as the most significant finding that would limit the athlete's ability to engage in training activities safely.