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  1. Menstrual cycle: What's normal, what's not - Mayo Clinic

    Apr 22, 2023 · Do you know when your last menstrual period began or how long it lasted? If not, it might be time to start paying attention. Keeping track of your menstrual cycles can help you …

  2. Heart rate: What's normal? - Mayo Clinic

    Oct 8, 2022 · A normal resting heart rate for adults ranges from 60 to 100 beats per minute. Generally, a lower heart rate at rest implies more efficient heart function and better …

  3. Aspartate aminotransferase (AST) blood test - Mayo Clinic

    May 20, 2025 · An aspartate aminotransferase test, also called an AST test, is a blood test. It's commonly used to check the health of the liver. AST is a substance found mostly in the liver. …

  4. Mayo Clinic corrected QT interval (QTc) calculator - Medical ...

    Worried about QT interval prolongation? This online evidence based resource will help guide you how to measure the QT interval and calculate the QTc value with an easy to use calculator …

  5. Hyponatremia - Symptoms and causes - Mayo Clinic

    May 17, 2022 · Sodium plays a key role in your body. It helps maintain normal blood pressure, supports the work of your nerves and muscles, and regulates your body's fluid balance. A …

  6. Tachycardia - Symptoms and causes - Mayo Clinic

    Dec 15, 2023 · Jeff Olsen: This is a normal heartbeat. [HEART BEATING] Atrial fibrillation interrupts this regular beat. Fred Kusumoto, M.D., Cardiology, Mayo Clinic: In atrial fibrillation, …

  7. Enlarged liver - Symptoms & causes - Mayo Clinic

    Mar 5, 2022 · An enlarged liver is one that's bigger than normal. The medical term is hepatomegaly (hep-uh-toe-MEG-uh-le). Rather than a disease, an enlarged liver is a sign of …

  8. Liver function tests - Mayo Clinic

    Jan 18, 2025 · Risks. The blood sample for liver function tests is usually taken from a vein in your arm. The main risk associated with blood tests is soreness or bruising at the site of the blood …

  9. How many hours of sleep are enough? - Mayo Clinic

    Feb 1, 2025 · Age group Recommended amount of sleep; Infants 4 months to 12 months: 12 to 16 hours per 24 hours, including naps: 1 to 2 years

  10. Low hemoglobin count Causes - Mayo Clinic

    May 13, 2025 · Heavy menstrual bleeding (heavy menstrual bleeding-although even normal menstrual bleeding may cause a slightly low hemoglobin count) Causes shown here are …

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