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Renin is an enzyme produced by the kidneys that helps regulate blood pressure and fluid balance through the renin-angiotensin-aldosterone system. This test is used to help diagnose causes of high blood pressure and certain adrenal or kidney disorders.

Growth Hormone (GH) is produced by the pituitary gland and plays a key role in growth, muscle and bone development, and metabolism. This test helps evaluate growth disorders in children and pituitary gland function in adults.