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Lab Results Lab Test Results: Units of Measurement Lab Tests for Fibromyalgia Labor and Delivery Labor Induction and Augmentation Labor Trial After a Previous Cesarean Delivery, Deciding About Labyrinthitis and Vestibular Neuritis Lacerations (Cuts) Lactation Mastitis Lactic Acid Dehydrogenase (LDH) Lactose Intolerance Laetrile/Amygdalin (PDQ®): Integrative, alternative, and complementary therapies - Health Professional Information [NCI] Laetrile/Amygdalin (PDQ®): Integrative, alternative, and complementary therapies - Patient Information [NCI] Langerhans Cell Histiocytosis Treatment (PDQ®): Treatment - Health Professional Information [NCI] Langerhans Cell Histiocytosis Treatment (PDQ®): Treatment - Patient Information [NCI] Language Development Language Development in Newborns Laparoscopic Gallbladder Surgery for Gallstones Laparoscopic Inguinal Hernia Repair Laparoscopic Ovarian Drilling (Ovarian Diathermy) for PCOS Laparoscopic Surgery Laparoscopic Surgery for Endometriosis Laparoscopic Tubal Ligation Laparotomy for Pelvic Problems Laryngeal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] Laryngeal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] Laryngitis Laryngotracheobronchitis Laser Epithelial Keratomileusis (LASEK) Laser In-Situ Keratomileusis (LASIK) for Farsightedness Laser Iridotomy for Glaucoma Laser Photocoagulation and Cryopexy for Retinal Tears Laser Photocoagulation for Age-Related Macular Degeneration Laser Photocoagulation for Diabetic Retinopathy Laser Resurfacing Laser Surgery for Abnormal Cervical Cell Changes Laser Surgery for Genital Warts Laser Surgery for Glaucoma: Pros and Cons Laser Surgery for Nearsightedness, Deciding About Laser Surgery for Skin Cancer Laser Surgery for Warts Laser Therapy for Birthmarks Laser Trabeculoplasty for Glaucoma Laser Treatment for Varicose Veins LASIK (Laser In-Situ Keratomileusis) for Nearsightedness Last Days of Life (PDQ®): Supportive care - Health Professional Information [NCI] Last Days of Life (PDQ®): Supportive care - Patient Information [NCI] Late Effects of Treatment for Childhood Cancer (PDQ®): Treatment - Health Professional Information [NCI] Late Effects of Treatment for Childhood Cancer (PDQ®): Treatment - Patient Information [NCI] Lateral Collateral Ligament (LCL) Injury Latex Allergy Laxatives Lazy Eye (Amblyopia) Lead Poisoning Lead Poisoning in Children: Questions Before Screening Lead Poisoning Screening Lead Poisoning: Contaminated Drinking Water Lead Poisoning: Jobs and Hobbies That May Increase Risk Lead Poisoning: Nutrition and Food Preparation Lead Poisoning: Reducing Lead in Your Home Lead Poisoning: Tips for Those Who Work With Lead Learning Disabilities Learning to Talk Left Ventricular Hypertrophy (LVH) Leg Amputation Leg Aneurysm Leg Cramps at Night Leg Cramps During Pregnancy Leg Injuries Leg Problems, Noninjury Legionnaires' Disease and Pontiac Fever Lennox-Gastaut Syndrome Leriche's Syndrome Leukemia Leukemia, Radiation Therapy for Leukotriene Pathway Modifiers for Long-Term Control of Asthma Levels of Evidence for Adult and Pediatric Cancer Treatment Studies (PDQ®): Treatment - Health Professional Information [NCI] Levels of Evidence for Cancer Genetics Studies (PDQ®): Genetics - Health Professional Information [NCI] Levels of Evidence for Cancer Screening and Prevention Studies (PDQ®): Screening - Health Professional Information [NCI] Levels of Evidence for Human Studies of Integrative, Alternative, and Complementary Therapies (PDQ®): Integrative, alternative, Levels of Evidence for Supportive and Palliative Care Studies (PDQ®): Supportive care - Health Professional Information [NCI] Levonorgestrel (LNg) IUD Levothyroxine Lice Lice Treatment: Examples of Over-the-Counter Products Lice, Visual Examination for Lice: Cleaning Lice From Combs, Clothing, and Other Items Lice: Removing Nits From Hair Lidocaine for Cluster Headaches Life Span and Smoking Calculator Life Transitions and PTSD Life-Prolonging Treatments at End of Life, Deciding About Lifestyle Changes That May Help Prevent Cancer Light Therapy Light Therapy (Using), For Seasonal Affective Disorder Light to Heavy Vaginal Bleeding Lightheadedness Linda's Story: Getting Active When You Have Prediabetes Linda's Story: Quitting Smoking Lowers My Risk Lip and Oral Cavity Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] Lip and Oral Cavity Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] Lipid Panel Lipoma Liposuction Listeriosis Lithotripsy (ESWL) for Kidney Stones, Deciding About Lithotripsy for Gallstones Little Leaguer's Elbow (Medial Apophysitis) Liver (Hepatocellular) Cancer Prevention (PDQ®): Prevention - Health Professional Information [NCI] Liver (Hepatocellular) Cancer Prevention (PDQ®): Prevention - Patient Information [NCI] Liver (Hepatocellular) Cancer Screening (PDQ®): Screening - Health Professional Information [NCI] Liver (Hepatocellular) Cancer Screening (PDQ®): Screening - Patient Information [NCI] Liver Function Panel Liver Function Tests Liver Resection Liver Tests for Mononucleosis Liver Transplant for Hepatitis B Living Organ Donation Living Will Living Will Living With a Spinal Cord Injury Living With an Ostomy Living With More Than One Health Problem Lizard and Snake Bites Local Anesthesia Local Anesthesia for Childbirth Localized Prostate Cancer, Should I Have radiation Therapy or a Prostatectomy? Lockjaw Long-Acting Beta2-Agonists for Long-Term Control of Asthma Long-Term Care Choices Long-Term Care for Alzheimer's or Other Dementia, Deciding About Long-Term Care for Stroke, Deciding About Loop Electrosurgical Excision Procedure (LEEP) for Abnormal Cervical Cell Changes Loop Electrosurgical Excision Procedure (LEEP) for Genital Warts Loralie's Story: It's Never Too Late Lorna's Story: There's No Fast Cure Losing Weight: Deciding About a Diet Plan Low Amniotic Fluid Low Back Pain Low Back Pain (Chronic), Anticonvulsants for Low Back Pain and Sex Low Back Pain, Acetaminophen for Low Back Pain, Anesthetic or Corticosteroid Injections for Low Back Pain, History and Physical Examination for Low Back Pain, IDET (Intradiscal Electrothermic Therapy) for Low Back Pain, Opiate Pain Relievers for Low Back Pain, Tricyclic and Tetracyclic Antidepressants for Low Back Pain: Easing Back Into Your Daily Activities Low Back Pain: Exercises to Reduce Pain Low Back Pain: Should I Have an MRI? Low Back Pain: Should I Have Spinal Manipulation? Low Back Pain: Should I Try Epidural Steroid Shots? Low Blood Pressure (Hypotension) Low Blood Sugar (Hypoglycemia) in People Without Diabetes Low Blood Sugar from Diabetes Low blood sugar from taking insulin, Dealing with Low blood sugar from taking oral diabetes medicine, Dealing with Low blood sugar in children with diabetes, Preventing Low Blood Sugar with Gestational Diabetes, Dealing With Low Testosterone Lower Leg Injuries Lower Leg Problems, Noninjury Lowering Your Health Care Costs Low-Lying Placenta Low-Potassium Foods Low-Salt Diet for Heart Failure Low-Salt Diets: Eating Out Low-Sodium Diet for Heart Failure Low-Vision Accommodations in Your Home LSD Lumbar Herniated Disc Lumbar Herniated Disc: Should I Have Surgery? Lumbar Pain Lumbar Spinal Fusion (Arthrodesis) Lumbar Spinal Stenosis Lumbar Spinal Stenosis: Should I Have Surgery? Lumbar Spondylosis Lumbosacral Region of the Spine Lumpectomy for Breast Cancer Lumpectomy or a Mastectomy to Treat Early-Stage Breast Cancer, Deciding About Lumps Under the Skin Lung Cancer Lung Cancer Prevention (PDQ®): Prevention - Health Professional Information [NCI] Lung Cancer Prevention (PDQ®): Prevention - Patient Information [NCI] Lung Cancer Screening Lung Cancer Screening (PDQ®): Screening - Health Professional Information [NCI] Lung Cancer Screening (PDQ®): Screening - Patient Information [NCI] Lung Cancer: Should I Have Screening? Lung Function in COPD Lung Surgery for Lung Cancer Lung Transplant for Cystic Fibrosis Lungs and Airways Lupus (Systemic Lupus Erythematosus) Lupus and Antiphospholipid Antibody Syndrome Lupus and Pregnancy Lupus: Criteria for Diagnosis Lupus: Healthy Eating Lyme Disease Lyme Disease During Pregnancy and Nursing Lyme Disease: Role of Blood Tests Lymph Node Cancer (Non-Hodgkin's Lymphoma) Lymph Node Removal (Lymphadenectomy) for Melanoma Lymphadenectomy for Endometrial Cancer Lymphadenopathy (Swollen Lymph Nodes) Lymphedema Lymphedema (PDQ®): Supportive care - Health Professional Information [NCI] Lymphedema (PDQ®): Supportive care - Patient Information [NCI] Lymphedema: Managing Lymphedema Lymphoma, Radiation Therapy for