Fitness basics
Learning Center
Hematocrit test
Learn about this red blood cell blood test, including why it's used and what to expect.
Holter monitor
This wearable device keeps track of the heart's rhythm during daily activities. Learn when you might need one and what to expect.
Hormonal IUD (Mirena)
This birth control device gives long-acting protection that can be reversed.
Ileoanal anastomosis (J-pouch) surgery
This surgery removes the large intestine. It's often done to treat ulcerative colitis and other bowel conditions.
Intraoperative magnetic resonance imaging (iMRI)
Find out how neurosurgeons use intraoperative magnetic resonance imaging (iMRI) during brain surgery.
Intravenous pyelogram
An intravenous pyelogram is an imaging exam that may be used to help diagnose urinary tract disorders. Learn what to expect during the exam.
Labor induction
Know what to expect during this procedure to start labor before it begins on its own.
Laryngotracheal reconstruction
Laryngotracheal reconstruction surgery — Comprehensive overview covers why it's done and what's involved with the procedure.
Lumbar puncture (spinal tap)
Learn about lumbar puncture, which removes a sample of cerebrospinal fluid to find infections, bleeding and other conditions. It also is called a spinal tap.
Lumpectomy
Learn what to expect from this breast-conserving surgical procedure.
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