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Ejection fraction: An important heart test - Mayo Clinic
Jan 29, 2025 · Ejection fraction is a measurement of the percentage of blood leaving the heart each time it squeezes. When the heart squeezes, it's called a contraction. Ejection fraction is just one of many tests your healthcare professional may use to see how your heart works. The heart squeezes and relaxes ...
Menstrual cycle: What's normal, what's not - Mayo Clinic
Apr 22, 2023 · Keeping track of your menstrual cycles can help you understand what's typical for you. You also can record your ovulation and find important changes — such as a missed period or menstrual bleeding that isn't typical. While irregularities in your period usually aren't serious, sometimes they are caused by other health problems.
A1C test - Mayo Clinic
Feb 22, 2025 · Overview The A1C test is a common blood test for diagnosing diabetes. For people living with diabetes, the test checks how well they manage blood sugar levels. The A1C test also is called the glycated hemoglobin, glycosylated hemoglobin, hemoglobin A1C or HbA1c test. An A1C test result shows the average blood sugar level over the past 2 to 3 months. The …
Vitamin D - Mayo Clinic
Mar 21, 2025 · Vitamin D is a nutrient the body needs, along with calcium, to build bones and keep them healthy. The body can absorb calcium only if it has enough vitamin D. Calcium is a major part of bones. Vitamin D also has many other uses in the body. It supports immune health and helps keep muscles and brain ...
Hyponatremia - Symptoms and causes - Mayo Clinic
Jul 18, 2025 · Hyponatremia is the term used when your blood sodium is too low. Learn about symptoms, causes and treatment of this potentially dangerous condition.
Blood pressure: Does it have a daily pattern? - Mayo Clinic
May 22, 2024 · Does blood pressure have a daily pattern? I've noticed that my blood pressure is always lower in the morning than in the afternoon.
Blood pressure chart: What your reading means - Mayo Clinic
Feb 28, 2024 · Here's a look at the four blood pressure categories and what they mean for you. If your top and bottom numbers fall into two different categories, your correct blood pressure category is the higher category. For example, if your blood pressure reading is 125/85 mm Hg, you have stage 1 hypertension.
Blood sugar testing: Why, when and how - Mayo Clinic
Jan 16, 2024 · Blood sugar testing: Why, when and how Blood sugar testing is an important part of diabetes care. Find out when to test your blood sugar, how to use a blood sugar meter and more. By Mayo Clinic Staff
Bone density test - Mayo Clinic
Overview A bone density test determines if you have osteoporosis — a disorder characterized by bones that are more fragile and more likely to break. The test uses X-rays to measure how many grams of calcium and other bone minerals are packed into a segment of bone. The bones that are most commonly tested are in the spine, hip and sometimes the forearm.
Low blood pressure (hypotension) - Symptoms and causes
Jun 13, 2024 · What's considered low blood pressure for one person might be OK for someone else though. Low blood pressure might cause no symptoms that you notice. Or it might cause dizziness and fainting. Sometimes, low blood pressure can be life-threatening. The causes of low blood pressure include dehydration and other serious medical conditions. It's important to find …