What interval makes sense for repeating ferritin on liraglutide?

Concretely: ferritin · liraglutide.

I want to decide this in advance so that I am not deciding it under pressure later.

Assume I will follow the plan I write down, so I would like it to be a good one.

How would you structure this, and what thresholds would you set in advance?

Before reacting to any single value, check whether it is outside the interval by an amount larger than the assay's own variation.

Same laboratory, same method, same time of day, same fasting state. Between-laboratory differences on several common analytes are larger than the changes people are trying to detect.

Headline results, principal programmes

Concretely, a sensible core for this population is a full blood count, renal function with electrolytes, liver enzymes with bilirubin, a fasting lipid panel with apolipoprotein B, HbA1c and thyroid-stimulating hormone.

Biological variation data are published per analyte and are the basis for the reference change value — the difference between two results that is larger than noise.

Ordering tests you will not act on generates anxiety and incidental findings, both of which have costs.

Decide the action for each result before you order the test.

edited 11 Sept 2025 by two_two_micron — fixed an arithmetic slip in the third paragraph

Answering this needs to distinguish screening from monitoring. A screening panel looks for the unexpected; a monitoring panel tracks something you already have a reason to watch.

Delta checks — comparing against your own previous value — are far more sensitive than comparing against a population interval, which is the argument for keeping a series rather than a snapshot.

To be exact about it, haemolysis in the sample raises potassium and several enzymes spuriously. If a result is bizarre, ask whether the sample was flagged before building a theory on it.

Pre-analytical factors — posture, tourniquet time, fasting, sample handling — are the largest source of error in routine biochemistry, well ahead of the analysis itself.

One out-of-range value on a twenty-analyte panel is expected. Two on a repeat is a finding.

Answer first: decide what you would do differently for each possible result before you order the panel. Anything that fails that test is a number you will worry about and not act on.

Repeat before you react. A single abnormal value has a substantial probability of being within the combined biological and analytical variation of a normal one.

Keep the reports rather than the numbers. Units, reference intervals and methods all vary, and a bare number two years later is not comparable to anything.

Reference intervals are conventionally the central ninety-five per cent of a reference population, which is the direct cause of the one-in-twenty out-of-range rate on a healthy panel.

Baseline first, then a repeat under identical conditions. Everything else is secondary.

Specifically, this is answerable, and the answer is mostly about which tests rather than how many.

Timing matters per analyte: cortisol and testosterone are diurnal, triglycerides are postprandial, and creatinine responds to hydration and to recent training. Fixing the conditions removes most of the noise.

Research-use compounds are not approved for human use, and no panel makes that safer.

Same laboratory, same time, same fasting state, or the comparison is not a comparison.

Standardise the conditions — same time of day, same fasting state, same laboratory — or you are measuring the conditions rather than yourself.

A twenty-analyte panel run on a healthy person will produce, on average, one out-of-range result purely from how reference intervals are constructed. That is arithmetic rather than pathology.

External quality assurance schemes document between-laboratory differences on common analytes that routinely exceed the size of clinically interesting changes.

Nothing here is medical advice. If something is out of range and you do not know why, that is a consultation rather than a research project.

Keep the full report, not the number. You will need the units and the interval later.