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  • Blood Test: von Willebrand Factor (vWF) Activity - Ristocetin Cofactor for Parents


    A von Willebrand factor (vWF) activity - ristocetin cofactor test lets doctors evaluate the functioning of a protein that helps blood to clot.

  • Blood Test: von Willebrand Factor (vWF) Antigen for Parents


    Doctors order the vWF antigen test to help diagnose or monitor the treatment of von Willebrand disease.

  • Blood Test: Testosterone for Parents


    A testosterone blood test may be done if a child seems to be entering puberty earlier or later than expected, or to check for damage or disease of the testes or ovaries, adrenal glands, or pituitary glands.

  • Test-Taking Tips for Teens


    Do you sweat, chew your pencil, and feel butterflies in your stomach as your teacher hands out a test? Study these test-taking tips!

  • Blood Test: Luteinizing Hormone (LH) for Parents


    A luteinizing hormone (LH) test measures the level of this hormone in the bloodstream. LH plays an important role in sexual development.

  • Blood Test: Estradiol for Parents


    Estradiol is the most important form of the hormone estrogen. Doctors may order an estradiol test if puberty seems to be starting earlier or later than expected, or to evaluate menstrual problems.

  • COVID-19 Tests: Which One Is Best? for Parents


    Two kinds of tests can see if someone is infected with COVID-19: molecular tests (such as PCR) and antigen tests. Find out how they differ and which might be best for you or your family.

  • Stool Test: Giardia for Parents


    This test may be done if a child has watery diarrhea, belly pain, lots of intestinal gas, appetite loss, and nausea or vomiting.

  • Prenatal Tests: Second Trimester for Parents


    Find out what tests may be offered to you during weeks 13 through 26 of pregnancy.

  • Blood Test: Erythrocyte Sedimentation Rate (ESR) for Parents


    An erythrocyte sedimentation rate test (ESR) detects inflammation that may be caused by infection and some autoimmune diseases.

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