Plainly written health guides, with the evidence graded
10 guides
Edited by Tomas Ottersen, editor responsible for bloodwork and screening.
Ferritin usually tracks how much iron your body has in store. When it climbs while the iron itself looks scarce, the number has stopped answering that question and started asking a different one.
Strong evidence18 Sept 2026
The two results look like they contradict each other. They don't — one of them is designed to move first, and the pattern it makes has its own name and its own, genuinely unsettled, rulebook for what to do next.
Strong evidence18 Sept 2026
Every lab report prints the same five bands, but a 130 mg/dL result means something different depending on what else is true about you — and the guideline that set the bands was rewritten around that fact.
Moderate evidence18 Sept 2026
A single flagged ALT on a routine panel rarely means what a worried search implies. What actually matters is how far above your own lab's upper limit the number sits, and whether a repeat test says the same thing twice.
Strong evidence18 Sept 2026
Under one country's diagnostic guidance, 5.7% is the first number inside prediabetes. Under another's, the identical reading is still comfortably normal — and the reading itself hasn't moved.
Strong evidence18 Sept 2026
A lipid panel reports four numbers, not one, and it is entirely possible for three of them — total cholesterol, LDL, HDL — to land in range while the fourth, triglycerides, does not. What that split result is actually telling you depends on how far out of range it sits.
Moderate evidence18 Sept 2026
Two people can watch the exact same number fall and be looking at completely different situations — one reversible within days, one worth a same-week phone call. The lab slip alone can't tell you which.
Strong evidence18 Sept 2026
A result of 15 ng/mL gets flagged as deficient on some lab reports and merely borderline on others, and the difference isn't your body — it's which of two federal-level frameworks printed the reference range on your form.
Contested18 Sept 2026
Low B12 gets filed under diet almost automatically. For someone who already eats meat, fish, dairy or eggs, the more useful question is where between the stomach and the small intestine the vitamin actually stopped getting through.
Moderate evidence18 Sept 2026
Cutting saturated fat and adding more fish is supposed to move this number. When it doesn't, the reason is rarely effort — it's that diet is only one of several things that set where your HDL sits.
Moderate evidence18 Sept 2026