Dr. Joseph Errick Ravenell MD

The ABO (A, B, AB, or O) blood group system is used to classify different types of antibodies in the plasma and antigens in the red blood cells (RBCs). The ABO blood group and RhD antigen determine the type of blood that is a perfect match for blood transfusions. The four ABO blood groups are: ...

As the urinary bladder fills, the sensation to release urine gradually builds up. Few people have a continuous urge to ease the bladder while experiencing pain. This situation, called bladder spasms, may lead to wetting one's pants. Bladder spasms are caused by the muscles of the bladder contracting...

The mumps is a viral infection of the parotid glands, the saliva producing glands present within the cheek in front of the ears. The infection often results in the swelling of the parotid glands. This contagious infection was contained to a large extent after the introduction of the mumps...

Vigorous exercise for 30 minutes every day lowers the risk of heart disease in children, when compared to those who do not exercise. Kids who had regular, moderate exercise for 35 minutes a day had very low levels of cholesterol, triglycerides blood glucose levels, blood pressure, and a small waist...

Oliguria is a medical term used when referring to a decreased urine output. Oliguria is considered when a person’s urine output is less than 400 mL in a 24-hour period. When it comes to infants, oliguria occurs when the urine output is less than 0.5 mL/kg/hr for 24 hours. Anuria is the absence...

“People often come to doctors because of chronic tiredness. It is one of the most common complaints that bring them to the doctor”, says J. Fred Ralston Jr., MD, an internist practicing in western Tennessee and past president of the American College of Physicians. Ralston adds that there are...