Medically reviewed by: KidsHealth Medical ExpertsThis link opens in a new tab Learn About Primary Care Pediatrics at Nemours Children's HealthThis link opens in a new tab The digestive system breaks ...

Medically reviewed by: Melanie L. Pitone, MDThis link opens in a new tab Learn About Allergy & Immunology Care at Nemours Children's HealthThis link opens in a new tab An allergy (say: AL-ur-jee) is ...

Medically reviewed by: KidsHealth Medical ExpertsThis link opens in a new tab Learn About Primary Care Pediatrics at Nemours Children's HealthThis link opens in a new tab How do you remember the way ...

Medically reviewed by: KidsHealth Medical ExpertsThis link opens in a new tab Learn About Primary Care Pediatrics at Nemours Children's HealthThis link opens in a new tab Reproduction is the process ...

Medically reviewed by: Larissa Hirsch, MDThis link opens in a new tab Learn About Primary Care Pediatrics at Nemours Children's HealthThis link opens in a new tab The male reproductive system is made ...

Medically reviewed by: KidsHealth Medical ExpertsThis link opens in a new tab Learn About Primary Care Pediatrics at Nemours Children's HealthThis link opens in a new tab We see and hear about hearts ...

Medically reviewed by: Yamini Durani, MDThis link opens in a new tab Learn About Primary Care Pediatrics at Nemours Children's HealthThis link opens in a new tab Putting things in their mouths is one ...

Medically reviewed by: Allison T. Dovi, PhDThis link opens in a new tab Learn About Behavioral Health (Psychology and Psychiatry) at Nemours Children's HealthThis link opens in a new tab Parents do ...

What Is the Estradiol Blood Test and Why Is It Done? An estradiol (ess-truh-DYE-ul) blood test measures the level of the hormone estradiol in blood. Estradiol is a main form of the sex hormone ...

Medically reviewed by: T. Ernesto Figueroa, MDThis link opens in a new tab Learn About Urology at Nemours Children's HealthThis link opens in a new tab Testicular torsion is an emergency condition. It ...

Medically reviewed by: Corinna L. Schultz, MDThis link opens in a new tab Learn About Cancer & Blood Disorders Care at Nemours Children's HealthThis link opens in a new tab Beta thalassemia is an ...

What Is a Spinal Tap/Lumbar Puncture? A lumbar puncture, or spinal tap, is a medical test that involves collecting a small sample of cerebrospinal fluid (CSF) for examination. This clear, colorless ...