It’s not personal if the nurse isn’t using the thinnest needle on you. Find out why certain needle thicknesses are needed and ...

The anion gap blood test measures the acid-base and electrolyte balance in the blood. Results can show whether there is an imbalance in a person’s pH levels, which may be making the blood too acidic ...

A blood osmolality test measures the blood for the concentration of certain dissolved particles. This test can show whether a person has an irregular balance of fluids in their body. Osmolality tests ...

Medically reviewed by Kelly Wood, MD Key Takeaways A TPO antibody test helps diagnose autoimmune thyroid diseases like Hashimoto’s thyroiditis.A positive test result means antibodies are present and ...

Brad Reisfeld is a professor of chemical and biological engineering, biomedical engineering, and public health at Colorado State University. Your blood serves numerous roles to maintain your health.

Following your doctor’s instructions is the most important part of preparing for a blood test. Sleeping well, staying hydrated, and avoiding certain foods and drinks can also provide benefits. Blood ...

A tissue transglutaminase IgA test or tTg-IgA test is an effective method used in the diagnosis of celiac disease. It is a blood test that checks for antibodies or immunoglobulins, which are proteins ...

A mean corpuscular volume (MCV) test is a blood test that measures the size and volume of your red blood cells. Red blood cells carry oxygen from the lungs to other body parts. An MCV test is often ...