Browse concise explainers to understand what “high” or “low” means for your blood test markers. Grouped by system for clarity and quick reference.
Which blood test markers are most important to watch?
Doctors usually look at trends in groups of markers rather than one number alone. Liver enzymes (ALT, AST, ALP, bilirubin), kidney markers (creatinine, eGFR), iron and ferritin, cholesterol and triglycerides, and thyroid markers like TSH are often reviewed together to understand the bigger picture.
Does one high or low lab result always mean disease?
Not necessarily. Many markers can be temporarily high or low after illness, dehydration, intense exercise or medication changes. Persistent changes on repeat tests, or several markers shifting in the same direction, are more likely to need follow-up.
How can these marker explainers help me before my doctor visit?
The explainer pages give you a plain-language overview of what “high” or “low” often means, how markers interact (for example creatinine with eGFR, or ALT with AST), and what questions you might want to ask your clinician. They do not replace medical advice, but help you arrive better prepared.
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