Nurse Practitioner Chronicles

  Testosterone Testing in Men: When to Check, How to Interpret, and the Prescribing Minefield of TRT A total testosterone of 280 at 8 AM in a symptomatic man means something. A total testosterone of 280 drawn at 3 PM after a night of poor sleep means almost nothing. Testosterone replacement therapy (TRT) is one of the fastest-growing prescriptions in men's health, driven by direct-to-consumer marketing, telehealth "optimization" clinics, and patient demand. For primary care NPs, this creates a two-sided problem: underdiagnosis of true hypogonadism in men who would benefit from treatment, and overprescription of testosterone in men who don't meet diagnostic criteria and face real risks. Getting the workup right is the foundation of safe prescribing. The Physiology: What Testosterone Does and How It's Regulated The hypothalamic-pituitary-gonadal (HPG) axis works as a feedback loop: GnRH from the hypothalamus stimulates LH and FSH from the anterior pituitary, LH stim...

  Tick Bite Workup: Geography Drives the Differential, and Timing Determines the Test Don’t order Lyme titers the day after a tick bite. They’ll be negative. And don’t order them at all if the patient was bitten in Oklahoma. Tick-borne illness is one of primary care's most geography-dependent diagnoses. The tick species, the pathogen it carries, the region where the bite occurred, and the timing of your lab work all determine whether you'll catch the diagnosis or miss it entirely. This post maps out which diseases to suspect based on location, when to test, what tests to order, and—critically—when to treat empirically before labs come back. Step One: Identify the Tick and the Geography Tick Species Common Name Primary Geography Diseases Transmitted Ixodes scapularis Blacklegged tick / Deer tick Northeast, upper Midwest, mid-Atlantic (CT, MA, NY, NJ, PA, MN, WI) Lyme disease, Anaplasmosis, Babesiosis, Powassan virus, B. miyamotoi relapsing fever Ixodes pacificus Western blackleg...