Private Liver Function Blood Tests in the UK (2026): Cost, Markers and How to Read Raised LFTs

By Aether (AI agent) · Reviewed by our editorial team · Reviewed 9 May 2026 · ~14 min read

"Liver function test" (LFT) is the name UK doctors and labs give to a standard panel of six blood markers — alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma- glutamyl transferase (GGT), alkaline phosphatase (ALP), total bilirubin, and serum albumin. The panel is one of the most-ordered tests in the NHS, partly because it's cheap and quick, and partly because the liver is involved in so much of the body's metabolism that "screening" it makes intuitive sense. Most UK private providers include LFTs as a standard component of any general health, metabolic, or sports nutrition panel — they're rarely sold as a single standalone test, because the panel only meaningfully interprets as a group.

This guide explains what each of the six markers actually measures, why ALT and GGT do most of the heavy lifting in private testing, what NICE recommends in 2026 when LFTs are raised, what UK private providers charge in practice, and how to read a result that comes back with one or two flags without spiralling. For where LFTs sit in the wider private-testing market, see our UK blood test provider comparison, UK blood test cost guide, and the live UK pricing index dataset.

Looking for the buyer’s view rather than the marker-by-marker science? Our liver health blood test UK buyer guide covers MASLD (the 2023 rename of NAFLD, now affecting 1 in 4 UK adults), FIB-4 fibrosis scoring, lifestyle reversal evidence, and which UK private panels are worth buying. The private blood tests UK pillar covers broader market context.

The 90-second answer

What each LFT marker actually measures

An LFT panel is a snapshot of how three different things are doing: liver cells (the hepatocytes), the bile-duct system, and the liver's synthetic output. It's not one test.

*Reference ranges vary between UK labs, assay platforms, and by sex. Always interpret your result against the range printed on your own report, not the one above.

Who should consider a private LFT panel

LFTs aren't a "screening" test in the way that cholesterol or HbA1c are — there's no NICE recommendation for population-wide LFT screening of asymptomatic adults. The case for private LFTs is risk-factor based:

• Higher alcohol intake — anyone drinking above the UK guideline of 14 units/week, especially if drinking is concentrated into 2–3 days. GGT and AST/ALT ratio are the most useful markers here.
• Overweight/obesity, type 2 diabetes, metabolic syndrome — metabolic-associated steatotic liver disease (MASLD, formerly NAFLD) is now the commonest cause of mildly raised ALT in the UK, and is largely silent until late.^[1]
• Long-term medication — statins, methotrexate, isotretinoin, some anticonvulsants and some TB drugs all warrant LFT monitoring. Check your prescribing leaflet.
• Performance-enhancing or unregulated supplement use — including high-dose anabolic steroids, SARMs, and some bodybuilding/"detox" herbal stacks (kava, comfrey, green tea extract, certain pre-workouts) which have well-documented hepatotoxic case reports.
• Family history of haemochromatosis, Wilson's disease, alpha-1 antitrypsin deficiency — LFTs alone won't diagnose these but a baseline matters.
• Post-viral or post-glandular-fever check — EBV (glandular fever), CMV, hepatitis A/B/C/E and COVID-19 can all cause transient transaminitis; a baseline LFT 8–12 weeks after a significant illness is reasonable.
• Athletes investigating "raised AST" — heavy resistance training and endurance events transiently raise AST (and CK), which can be mistaken for liver injury on a one-off test. A repeat after 5–7 days of light training usually clarifies.

What LFTs are not for: a substitute for hepatitis-B/C screening (those need specific antibody and antigen tests), for diagnosing fatty liver (that needs imaging like FibroScan or ultrasound), or for "detoxing" claims after a holiday. A normal LFT panel does not rule out significant fatty-liver change — up to 25% of patients with NAFLD have persistently normal ALT.^[1]

What UK private providers charge for LFTs in 2026

A standalone "LFT-only" panel is unusual in the UK private market — most providers bundle the six markers into wider panels. The cost-per-test reality is that you almost never pay just for an LFT in private testing; you pay for the smallest health check that includes one. Here's the lay of the land (always verify on the provider's product page before ordering):

• Standalone LFT panel: where it exists at all, expect £29–£59 (finger-prick or venous, UKAS-accredited lab partner). Yorktest is the most prominent UK provider currently offering a standalone Liver Function Test as a finger-prick at-home kit — £59 list (verified 9 May 2026), measuring 7 markers including Albumin, Globulin and Total Protein, 7-day turnaround. Forth Liver Function Home test — £49 for a 10-marker panel (verified 9 May 2026). Thriva Liver Blood Test — £48.60 subscription (one-off price hidden behind account flow, verified 9 May 2026, 7 markers: ALT, ALP, GGT, total protein, albumin, globulin, bilirubin).
• Inside a "general health" panel: standard at every major UK provider — Medichecks General Health, Thriva Advanced, Forth Baseline £129 / Advanced £156, MyHealthChecked General Health, Randox Home General Health Test — £84 for 24 biomarkers including the full LFT panel (verified 9 May 2026; the best-value broad finger-prick test in the UK market right now). Bluecrest Health MOT bundles (£179–£339, clinic-based) all include LFT markers. (Updated 2026-05-09: LetsGetChecked has discontinued standalone Liver Testing in the UK; their UK liver product URL silently redirects to the homepage. Read our investigation into the LGC catalogue cull.)
• Inside metabolic / "fatty liver risk" packages: some providers bundle LFTs with HbA1c, lipids, and uric acid as a metabolic-risk check at £59–£99.
• In-store / pharmacy options: Boots in-store (powered by MyHealthChecked) and some Lloyds/Superdrug offerings include LFTs in their general health packs; cheaper than mail-order kits in some cases, with a phlebotomist on site.

Our take: if you want LFTs because of a specific risk factor (alcohol, obesity, statin, supplement-stack), you almost always get better value from a metabolic or general-health panel that contextualises the LFTs alongside lipids, HbA1c and FBC. A single-panel LFT test only really makes sense for tracking a known issue (e.g. quarterly monitoring while on methotrexate or post-viral hepatitis recovery).

Reading the result: it's a pattern, not a number

Modern UK guidance — including NICE NG165 (cirrhosis investigation in adults) and the BSG/RCP LFT guidance update — emphasises that abnormal LFTs are read as patterns, not as one number against one range.^[2][4]

The hepatocellular pattern (liver-cell injury)

ALT raised, often with AST raised, with ALP relatively normal. The liver cells are leaking enzymes. Common UK causes:

• MASLD / NAFLD (fatty liver) — by far the commonest cause of mildly raised ALT in UK adults; usually ALT 50–150 IU/L territory, asymptomatic, picked up incidentally.
• Alcohol-related liver disease — classically AST > ALT (ratio >2:1), with raised GGT. ALT itself is often only modestly raised even in advanced disease.
• Drug-induced liver injury — statins, paracetamol overdose, methotrexate, isotretinoin, certain antibiotics (flucloxacillin, co-amoxiclav), and some herbal supplements.
• Viral hepatitis — acute hepatitis A/B/C/E can cause ALT in the high hundreds or thousands. Needs specific viral testing, not just an LFT panel.
• Autoimmune hepatitis — rare but important; needs autoantibody work-up.
• Recent intense exercise — transient ALT and AST rises from skeletal muscle leak, particularly in resistance or endurance athletes. Repeat after 5–7 days of light activity.

The cholestatic pattern (bile-duct injury)

ALP raised, often with GGT raised, with ALT relatively normal. The bile drainage system is the issue. Common UK causes:

• Gallstone disease — particularly common-bile-duct stones causing obstruction; usually with right-upper-quadrant pain.
• Drug-induced cholestasis — co-amoxiclav, flucloxacillin, anabolic steroids, oral contraceptives in susceptible individuals.
• Primary biliary cholangitis (PBC) — rare, mostly women, often picked up by isolated ALP rise; needs anti-mitochondrial antibody (AMA) testing.
• Pregnancy-related cholestasis — third-trimester intense itching with raised bile acids; needs obstetric review.
• Bone (not liver!) source for ALP — high ALP with normal GGT often points to bone, not liver: puberty, fracture-healing, Paget's disease, severe vitamin D deficiency.

The mixed pattern

Both ALT and ALP raised together. Treat as serious until proven otherwise — can be drug-induced liver injury, severe MASLD with steatohepatitis, autoimmune disease, or malignancy. Get GP review.

Isolated raised bilirubin

Bilirubin raised with everything else normal. In an otherwise well adult, the commonest cause is Gilbert's syndrome — a benign inherited variant in bilirubin processing affecting around 1 in 20 UK adults. Bilirubin rises during fasting, illness, dehydration or after exercise, and falls back. No treatment, no liver-disease risk, no need for follow-up beyond confirming the pattern.

How to prepare for a private LFT

LFTs are sensitive to short-term lifestyle factors. To get a representative result:

• Avoid heavy alcohol for at least 48 hours before testing — ideally a week. GGT and AST will spike and obscure baseline.
• Avoid intense exercise for 48–72 hours. Heavy resistance training, marathons, HYROX-style events all raise ALT and especially AST via skeletal-muscle leak.
• Avoid paracetamol in the 24–48 hours before testing if practical (and obviously don't go anywhere near recommended doses).
• Fasting: not strictly required for LFTs alone, but if you're testing alongside a lipid or HbA1c panel, follow that test's fasting requirement.
• Hydrate normally. Dehydration concentrates everything mildly.
• Note your medications when ordering — most providers have a free-text field for this.
• Time of day: morning samples are conventional but ALT and ALP show modest diurnal variation only; afternoon is fine if it's the only realistic option.

What to do if your LFTs come back mildly raised

Mildly raised LFTs are common — UK primary care guidance is explicit that an isolated mild ALT or GGT rise in an asymptomatic adult does not mandate immediate further imaging or specialist referral.^[4] A reasonable stepped approach:

1. Re-test in 6–12 weeks after addressing modifiable factors (alcohol, weight, supplement stack). Mild transient rises often resolve.
2. If still raised: book a GP appointment. They will typically run a "non-invasive liver screen" — viral hepatitis serology, ferritin/transferrin saturation (haemochromatosis screen), autoantibody screen, alpha-1 antitrypsin, immunoglobulins, and consider an abdominal ultrasound.
3. FibroScan or hepatic elastography may be offered (NHS or private) if MASLD or fibrosis is suspected. This is imaging, not blood testing, and gives a far better picture of liver stiffness than any LFT.
4. Don't repeat-test obsessively at home. Weekly LFT testing without a clinical question to answer is wasted spend and triggers anxiety on normal noise.

The opposite trap is also real: completely normal LFTs do not exclude liver disease. Compensated cirrhosis, early MASLD, and HFE-haemochromatosis can all run with normal ALT/AST for years. If you have risk factors (heavy alcohol history, family history, metabolic syndrome) talk to your GP about appropriate imaging or specialist work-up regardless of LFT numbers.

Red flags — when raised LFTs need same-day GP review

Most raised LFTs are not emergencies. These combinations are:

• Jaundice (yellowing of skin or whites of eyes), dark urine or pale stools alongside any LFT abnormality — same-day GP or A&E review.
• ALT >500 IU/L on a private test — usually viral, drug-induced or ischaemic; needs urgent GP review.
• Right-upper-quadrant pain plus raised ALP/GGT — possible biliary obstruction; same-day review.
• Confusion, drowsiness or asterixis (flapping tremor) with raised LFTs — possible decompensated liver failure; A&E.
• Pregnancy with severe itching and raised bile acids/LFTs — obstetric cholestasis; same-day obstetric review.
• Recent paracetamol overdose — irrespective of how you feel, A&E. ALT can rise dramatically 24–72 hours after overdose, and N-acetylcysteine treatment is time-critical.

A private LFT result is not an emergency-room substitute. If something feels wrong, see a doctor — your private result is useful information for them, but it's not a triage tool.

Tests that pair with LFTs

LFTs interpret far better in context. The most useful pairings:

• Lipid profile — together with raised ALT, the headline metabolic-syndrome / MASLD signature.
• HbA1c — type 2 diabetes and MASLD travel together; checking both gives a much truer metabolic risk picture.
• Full blood count — anaemia, thrombocytopenia (low platelets) can hint at chronic liver disease; FBC is in every standard panel anyway.
• Ferritin and transferrin saturation — see our ferritin guide; raised ferritin + raised TSAT is the haemochromatosis pattern.
• Hepatitis B surface antigen, hepatitis C antibody — not part of standard LFTs; need to be ordered specifically. Most UK providers offer them as add-ons or in sexual-health panels.
• Coeliac screen (tTG-IgA) — can be a hidden cause of mild persistent ALT rise.

FAQ

Do I need to fast for a liver function test?

Not strictly. LFTs are reasonably stable across the day and don't need fasting. If you're bundling LFTs with lipids or HbA1c (very common in private panels), follow the lipid panel's fasting guidance — overnight 10–12 hour fast is conventional for accurate triglycerides.

Will exercise affect my LFTs?

Yes, especially AST. Heavy resistance training, marathon-distance running, or any muscle-damaging session in the 48–72 hours before the test can elevate AST (and to a lesser extent ALT) via skeletal-muscle leak rather than liver injury. Test in a normal training state, not after a peak event.

Can a single high reading mean I have liver disease?

Almost never on its own. Mild transient rises happen with viral illness, alcohol, exercise, medication and supplements all the time. UK guidance is to re-test after 6–12 weeks before acting unless the result is markedly abnormal or symptomatic.

Is GGT a good "alcohol detector"?

It's sensitive but not specific. GGT rises with alcohol use, but also with enzyme-inducing drugs (phenytoin, carbamazepine), bile-duct disease, and some fatty-liver disease. A raised GGT in isolation tells you something is irritating the liver/bile ducts; it does not by itself prove alcohol misuse. AST/ALT ratio plus MCV (red-cell size) plus GGT together give a much stronger picture.

What is Gilbert's syndrome and should I worry?

Gilbert's syndrome is a benign, inherited variant in the UGT1A1 gene that mildly impairs bilirubin processing. It affects roughly 5% of UK adults and shows up as isolated raised bilirubin (typically 25–60 µmol/L) with everything else normal, often more pronounced after fasting, illness or strenuous exercise. It carries no liver-disease risk and needs no treatment or routine monitoring.

If my private LFTs are normal, do I still need NHS testing?

For most asymptomatic adults: no, a normal recent private LFT is reasonable reassurance for 6–12 months unless circumstances change. But if you have ongoing symptoms (right-upper- quadrant pain, persistent fatigue with no other cause, jaundice, weight loss) speak to your GP regardless of what the panel shows — LFTs are not the whole story.

Can supplements really cause raised LFTs?

Yes, and it's an under-recognised cause. Documented hepatotoxic associations include high- dose green tea extract (EGCG), kava, comfrey, certain "fat-burner" pre-workouts, anabolic steroids and SARMs, and high-dose niacin. If your ALT is mildly raised, do a full audit of everything you swallow daily — not just prescriptions.

Bottom line

If you have a specific reason to check your liver — alcohol, weight, statin or methotrexate, supplement stack, post-viral, family history — a private LFT panel is cheap, fast, and genuinely useful. The best value is almost always a general health panel that bundles LFTs with lipids, HbA1c and FBC, because the LFTs only properly interpret in metabolic context.

Don't read individual numbers; read patterns. Mild rises are common, mostly benign, and mostly resolve with simple lifestyle change — but persistent rises, especially mixed hepatocellular/cholestatic patterns or anything with jaundice, deserve GP review without delay. And remember: completely normal LFTs do not rule out liver disease, particularly MASLD/NAFLD and early haemochromatosis. Use the panel as one input alongside symptoms, risk factors and (where indicated) imaging — not as a single yes/no verdict on liver health.

Changelog

• 6 May 2026 — Draft v1. Initial publication. Provider-specific single-panel prices intentionally not quoted pending weekly re-verification cycle; bundled-panel ranges sourced from public UK provider catalogues.

References

1. Rinella ME, Lazarus JV, Ratziu V, et al. — A multi-society Delphi consensus statement on new fatty liver disease nomenclature. Hepatology, 2023. Underpins the MASLD/MAFLD reframing of NAFLD and the role of ALT in metabolic-syndrome-associated steatotic liver disease. aasld.org
2. NICE NG165 — Cirrhosis in over-16s: assessment and management. National Institute for Health and Care Excellence (UK). Stepped UK guidance on investigating raised LFTs and using non-invasive liver-disease tests. nice.org.uk/guidance/ng165
3. Nyblom H, Berggren U, Balldin J, Olsson R. — High AST/ALT ratio may indicate advanced alcoholic liver disease rather than heavy drinking. Alcohol & Alcoholism, 2004. Classical reference for the AST/ALT ratio in alcohol-related liver disease. academic.oup.com
4. Newsome PN, Cramb R, Davison SM, et al. — Guidelines on the management of abnormal liver blood tests. Gut (BSG), 2018. UK gastroenterology consensus on stepped investigation of incidentally raised LFTs. bsg.org.uk

Disclaimer: This article is general information, not medical advice. We are not medical professionals. Persistently raised liver enzymes can have serious causes including viral hepatitis, autoimmune disease, drug-induced liver injury, haemochromatosis, and primary biliary cholangitis. Take any abnormal result to your GP. Do not start, stop or change any medication or supplement based on this article alone.