Metabolic Health

Hemochromatosis Labs: Ferritin, TSAT, and the Testing Algorithm

AASLD-style path: TSAT ≥45% and/or high ferritin → HFE genotyping. Ferritin >1000 µg/L flags fibrosis risk; phlebotomy targets 50–100.

BY MARCUS CHEN 6 MIN READ 4 SOURCES

Iron panel laboratory report style papers beside a plain blood tube, no people — Illustration: Health Canon

In short

Screen with TSAT + ferritin. TSAT ≥45% is the AASLD-aligned sensitive gate toward HFE genotyping. In C282Y disease, ferritin >1000 µg/L raises cirrhosis concern; phlebotomy typically targets 50–100 µg/L. Ferritin alone misleads in inflammation.

Iron overload is a lab algorithm problem before it is a supplement problem. This page compresses AASLD/EASL-style gates into plain language for informed clinical conversations.

This article is informational and editorial only. It is not medical advice, diagnosis, or a treatment plan. Numbers and literature ranges cited here are not personal prescriptions. Consult a qualified clinician before changing medications, supplements, diet, equipment, or management of a diagnosed condition. Seek urgent care for emergencies.

What is the first-line iron panel algorithm?

When hereditary hemochromatosis (HH) is in the differential—symptoms, family history, or unexplained iron clues—order transferrin saturation (TSAT) and ferritin together. AASLD recommendation patterns: if TSAT is ≥45% or ferritin exceeds the upper limit of normal, proceed to HFE mutation analysis. The 45% TSAT cutoff identifies roughly 97.9–100% of C282Y homozygotes in guideline-cited performance. AAFP teaching notes normal ferritin plus TSAT <45% yields negative predictive value near 97% for excluding overload.

Primary source: AASLD 2011 hemochromatosis guideline (PMC); European updates in EASL 2022.

Hemochromatosis lab decision nodes (teaching summary)
Node	Typical figure	Action implication
TSAT gate	≥45%	Consider HFE genotyping (with clinical context)
HEIRS-elevated ferritin	>300 µg/L men; >200 women	Elevated store marker (lab ULNs vary)
Fibrosis-risk ferritin	>1000 µg/L in C282Y HH	Stage liver disease risk aggressively
Sub-1000 reassurance	<1000 µg/L without other risks	Advanced fibrosis unlikely in cited series
Phlebotomy target	50–100 µg/L ferritin	Induction endpoint band (not zero)

How should ferritin be interpreted beyond the HH pathway?

Ferritin is an acute-phase reactant. Infection, inflammatory disease, fatty liver, alcohol, and malignancy can elevate ferritin without HFE overload. That is why high ferritin with low or normal TSAT points away from classic HH and toward secondary hyperferritinemia workups. Example lab bands in AASLD tables show wide HH ranges (ferritin often hundreds to >1000) versus lower reference intervals that are lab-specific.

In confirmed C282Y disease, ferritin <1000 µg/L accurately predicts absence of cirrhosis in multiple series; >1000 associates with ~20–45% cirrhosis prevalence, higher when ALT/AST are up and platelets are low.

How do TSAT and ferritin behave during treatment?

During therapeutic phlebotomy, ferritin falls as stores mobilize; TSAT often remains high until depletion. Use ferritin (with hemoglobin/hematocrit safety checks) to guide induction—not TSAT alone as the stopping rule. Check ferritin about every 10–12 phlebotomies (~3 months) in classic protocols. Do not chase ferritin to frank deficiency.

What anti-patterns should patients and clinicians avoid?

Ordering HFE on everyone with fatigue and no iron studies.
Phlebotomizing metabolic hyperferritinemia without overload evidence.
Ignoring alcohol when ferritin exceeds 1000.
Treating a single non-reproduced mild TSAT bump as destiny.
Self-directed aggressive blood removal without monitoring.

What should careful readers do with this evidence?

Use primary sources linked in this article before changing household systems, training plans, or clinical conversations. Prefer measurements—lab panels, water tests, training logs, or certified product listings—over marketing claims. When evidence is observational, say so out loud: associations can guide research priorities and low-regret habits without becoming promises of disease prevention. When guidance bodies publish cutoffs or MCLs, treat them as the public reference layer and verify whether your situation is inside that legal or clinical scope. Re-check living agency pages because regulations and practice guidelines update. If two reputable sources disagree, dual-source the claim and prefer the document that states methods, units, and populations clearly. Finally, keep sex, age, pregnancy, and comorbidity modifiers in view whenever the underlying literature is limited to one demographic group.

Health Canon’s editorial standard ranks large controlled trials and codified regulations above single cohorts; cohorts above mechanism speculation; marketing last. The goal of densifying this topic cluster is enough depth that a reader can act without outsourcing judgment to a headline. If you only remember one habit from this page, make it the habit of asking for units, sample, and maintenance or adherence conditions before trusting a number.

What should careful readers do with this evidence?

Sources & citations

Frequently asked

Questions & answers

What TSAT level should trigger hemochromatosis genetic testing?

AASLD guidance has used a transferrin saturation cutoff of forty-five percent as a sensitive gate that identifies about 97.9 to 100 percent of C282Y homozygotes in cited performance. Recommendation patterns obtain both TSAT and ferritin; if either is abnormal—TSAT at or above forty-five percent or ferritin above the upper limit of normal—HFE mutation analysis is considered. Borderline values may be repeated, optionally fasting, before cascading to genetics.

Why is ferritin alone not enough?

Ferritin rises with iron overload but is also an acute-phase reactant that climbs with inflammation, liver disease, alcohol, and metabolic syndrome. Normal ferritin with TSAT under forty-five percent has a high negative predictive value—about ninety-seven percent in cited teaching—for excluding iron overload. Conversely, isolated ferritin of a few hundred in metabolic syndrome without high TSAT is a different pathway than classic HFE hemochromatosis.

What does ferritin over 1000 mean in C282Y disease?

In C282Y hereditary hemochromatosis series, ferritin under 1000 micrograms per liter is a strong predictor that cirrhosis is absent. Ferritin over 1000 associates with roughly twenty to forty-five percent cirrhosis prevalence in cited series, and combining high ferritin with abnormal liver enzymes and low platelets further raises fibrosis probability. That node drives more aggressive fibrosis staging—not panic over every ferritin above the lab reference range.

What ferritin target is used during phlebotomy?

AASLD and EASL framing commonly targets ferritin about fifty to one hundred micrograms per liter during induction, not zero or frank iron deficiency. During induction, ferritin is often checked about every ten to twelve phlebotomies. Transferrin saturation often stays high until stores are depleted; ferritin is the practical store marker. Maintenance schedules are individualized after target is reached.

Do men and women use the same ferritin cutoffs?

Reference ranges and screening thresholds are sex-specific. HEIRS-era elevated ferritin cutoffs often cited are over 300 micrograms per liter in men and over 200 in women. Men present earlier on average because menstruation provides partial iron loss protection in premenopausal women. Pregnancy, menopause, and transfusion history further modify interpretation—algorithms are starting points for clinicians, not self-phlebotomy instructions.