| Measure | Value |
|---|
A teaching model with rounded values. Absorption rates (heme about 15 to 40%, nonheme about 2 to 22% before meal effects), losses (about 1 mg a day, plus about 0.5 mg a day on average for menstruation, 1.5 mg more for heavy periods, about 4 mg a day late in pregnancy, about 230 mg per blood donation) and the links between stores and blood tests (1 ng/mL ferritin for about 8 mg stored iron) are simplified so changes show up within months. Turning on hemochromatosis restarts the run with several years of build-up already in the stores. Reference ranges vary by lab, age and sex. Real people vary a lot; this is not a diagnosis tool.
| Measure | Value |
|---|
A teaching model. TSH and free T4 drift toward new values over several weeks, and thyroid size grows only while TSH stays high. Reference ranges (TSH about 0.4 to 4.0 mIU/L, free T4 about 0.8 to 1.8 ng/dL) vary by lab. Real thyroid disease has many causes besides iodine.
For "predict then watch" items, make your choice first; the picture then plays what happens at the gut cell. Worked solutions show units cancelling (struck through in red).
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too.
Fictional people. Teaching scenarios with rounded values; not personal medical or diet advice.
Wrong picks are fine here. Each one tells you why.