17-OHP testing may produce false-positive test results. If the level is elevated but not so high that it is diagnostic of CAH, other tests may be performed, such as androstenedione and testosterone . An ACTH stimulation test may be also be ordered as a follow-up test (in CAH, ACTH stimulation will markedly increase 17-OHP levels). Molecular genetic testing may be performed to detect CYP21A2 gene mutations that can cause the condition. A karyotype test may be ordered as a follow-up test to detect chromosome disorders and to help determine a baby's sex. Electrolytes may be ordered to measure the person's sodium and potassium levels.