A mercury blood test measures recent mercury exposure, most often from fish and seafood but sometimes from workplace, household, or accidental sources. Learn what high and low results can mean, how blood testing differs from urine or hair testing, and what to discuss with a clinician.
Low haptoglobin often points to red blood cell breakdown, while high haptoglobin is usually a nonspecific inflammation signal. Learn how to interpret haptoglobin with LDH, bilirubin, reticulocytes, CBC, liver tests, and symptoms.
A high PT/INR usually means blood is clotting more slowly; a low INR is especially important for people taking warfarin because it may mean reduced clot protection. Learn how to interpret results safely.
High or low ACTH results are interpreted best with cortisol. Learn what common ACTH-cortisol patterns may suggest, why timing and sample handling matter, and what follow-up tests are often used.
A high or low growth hormone result usually can’t be interpreted from one number alone. Learn how GH, IGF-1, suppression tests, and stimulation tests are used to evaluate GH excess or deficiency.
A high or positive H. pylori result can mean active infection—or past exposure if it’s a blood antibody test. Learn how to interpret breath, stool, PCR, antibody, and biopsy results.
A high Lyme result usually means antibodies were detected; a low result usually means they were not. Learn how IgM, IgG, ELISA, Western blot, and two-tier testing change interpretation.
High or low EBV results depend on which marker is abnormal. Learn how VCA IgM, VCA IgG, EBNA IgG, Early Antigen, and EBV PCR are interpreted.
Hepatitis B results are usually interpreted as patterns of positive, negative, reactive, nonreactive, or quantitative antibody and viral-load values—not simply as one high or low number. Learn what common hepatitis B markers mean and what to ask next.
AST is a liver enzyme marker, but it can also rise from muscle, heart, and other tissue injury. Learn how high and low AST results are interpreted with ALT, bilirubin, ALP, symptoms, and repeat testing.
