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Lactic Acid Lactogenic Hormone Laparoscopy Laryngoscopy LDL Cholesterol Test Lead Leg X-Ray LH (Luteinizing Hormone) Lipase Lipid Profile Lipoprotein Analysis Liver and Spleen Scan Liver Biopsy Lower Gastrointestinal Series Lumbar Puncture Lung Angiogram Lung Biopsy Lung Cancer Screening: Low-Dose CT Scan Lung Function Testing, Home Lung Function Tests Lung VQ Scan Luteinizing Hormone Lyme Disease Test Lymph Node Biopsy