How do I read my own lab results?

Reading labs gets much easier with a system. MedlinePlus lays out the pieces: every result comes with a reference range - the span of values typical for healthy people at that lab. Values outside it get flagged high or low. That flag is a starting signal, not a verdict, because ranges are statistical: a small fraction of perfectly healthy people naturally fall outside them on any given test. Read in this order. First, which test is it and why was it ordered - a screening test answers a different question than a diagnostic one. Second, how far outside the range is it - barely over a boundary is a different conversation than triple the limit. Third, the trend - your own previous results are often the most meaningful comparison, because a value that is stable for years at slightly high says something different from one that jumped. Fourth, the context: fasting or not, medications, illness that week, even time of day can move numbers. And know that test results can be wrong - false positives and false negatives happen, as MedlinePlus notes, which is why surprising results often get repeated before anyone acts on them. Any result that worries you deserves a question to your clinician, who has the piece you lack: your history. Pymander is a free AI doctor, 24/7 by text. Paste in a result and it can explain what the test measures and what the range means.