Polycythemia vera can be distinguished from secondary polycythemia by which laboratory assay?

A physician would like to monitor an HIV positive patient for therapeutic response to anti-retroviral therapy. Select the most appropriate test to recommend:

A previously normal, full-term infant developed bilateral conjunctivitis at 2 weeks of age. The conjunctivitis was followed by severe coughing, but the infant remained afebrile. When the infant was 4 weeks old, a chest X-ray showed bilateral interstitial infiltrates. Aerobic bacterial culture grew only minimum amounts of normal flora organisms. Which of the following is the most probable infectious agent?

The role of nuclease in molecular laboratory procedures is to:

What sorts of companies utilize the advertising-supported revenue model? 

Severe fetal defects are associated with this virus:

Exercise impacts the output of which of the following?

What disorder is characterized by the following lab results?•       Hemoglobin = 6.2 g/dL•       MCV = 68 fL•       Serum iron – decreased•       TIBC – increased•       Ferritin – decreased•       Hgb electrophoresis = normal

Which of the following mechanisms promotes heat loss when body temperature is higher than normal?

These nucleated cells were seen in the peripheral blood of a 21 year old male with a relative and absolute lymphocytosis. The WBC is slightly elevated, and the patient reports feeling fatigued. What is the most appropriate reflex test?