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Genetic testing
Genetic testing: Learn why it's done, how to prepare and what to expect from diagnostic tests, carrier tests, prenatal tests and newborn screening.
Glucose challenge test
Know how to prepare for this gestational diabetes screening test.
Glucose tolerance test
These simple blood tests are performed to screen for diabetes. Your healthcare professional may suggest one or more of these tests depending on your risk factors.
HPV test
The HPV test can help identify your risk of cervical cancer. Learn more about how to prepare and what your results may mean.
Hematocrit test
Learn about this red blood cell blood test, including why it's used and what to expect.
Henoch-Schonlein purpura
Learn about the symptoms, causes and treatment of this blood vessel disease, also called IgA vasculitis, that causes a purplish rash on the lower legs.
High cholesterol in children: How is it treated?
High cholesterol in children can lead to narrowed and hardened arteries, increasing the risk of heart disease later in life.
Hodgkin's vs. non-Hodgkin's lymphoma: What's the difference?
Learn how types of lymphomas are determined using lab tests to examine cancer cells.
Holter monitor
This wearable device keeps track of the heart's rhythm during daily activities. Learn when you might need one and what to expect.
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
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