Your patient’s symptoms are nonspecific, and with normal lab values, she is by definition euthyroid. Given the menorrhagia, fatigue, and brittle nails, start by making sure she is not iron ...

Normal Lab Values: Men: .7-1.3, Women: .6-1.1 mg/dl. The ratio of BUN to creatinine should be between 10:1 and 20:1. This test is a blood test that looks at how much creatinine is in the bloodstream.