Syphilis blood test results are interpreted by combining treponemal and nontreponemal tests—not by treating a single “high” or “low” number as a diagnosis. Learn what reactive, nonreactive, low-titer, high-titer, and discordant syphilis results can mean.
A high celiac blood test usually means celiac-related antibodies were detected and follow-up is needed. A low or negative result can be reassuring, but it does not always rule out celiac disease—especially if you were already avoiding gluten or have low total IgA.
A lipid panel measures total cholesterol, LDL, HDL, triglycerides, and often non-HDL cholesterol. Here’s how to read high and low results, what patterns may mean, and when to follow up with a clinician.
A fasting glucose result is a snapshot of your blood sugar after not eating. Learn what high, low, borderline, and discordant fasting glucose results can mean—and what follow-up questions to ask.
A high or low A1C result can mean different things depending on whether you have diabetes, whether the test is being used for screening, and whether red blood cell or hemoglobin conditions may affect accuracy. Here’s how to read common A1C ranges and what to discuss with a clinician.
A lab-professional-informed guide to ordering your own blood tests online: how direct-access lab testing works, what to compare, how to prepare, and when to review results with a healthcare professional.
