A Raised ALP and GGT with a Normal ALT
Liver tests split into two families. One reports cells leaking, the other reports bile not flowing. ALP and GGT up with ALT untouched is the second family, and it moves the investigation from hepatitis screens toward pictures of the bile ducts.
The pattern on your report
- ALP High · moderate Key
- GGT High · moderate Key
- ALT Normal Key
- Bilirubin Normal Key
Printed as: ALT in U/LALP in U/L— One notation, but the reference range differs sharply with age, so the range printed beside the result matters.GGT in U/L— Labeled GGT, gamma-GT or GGTP.Bilirubin in umol/Lor mg/dL— Roughly seventeen times apart: 34 umol/L is about 2.0 mg/dL.
Why the numbers look like this
Hepatocytes and the cells lining the bile ducts sit next to each other and fail differently. Damage to hepatocytes spills ALT into the blood. Obstruction or irritation of the bile ducts induces ALP and GGT on the cells lining them, so those two climb while ALT stays where it was.
GGT is doing a second job here as well. ALP comes from bone as readily as from liver, and on its own it cannot say which. A GGT rising alongside settles the source in the biliary system, because bone does not make GGT. That is why the two are read together, and why an ALP with a normal GGT is a different pattern altogether.
Not being flagged is not the same as normal
There is no threshold at which a cholestatic pattern becomes significant. What matters is the shape rather than the height: the ratio of how far ALP has risen above its limit compared with how far ALT has risen above its own is what defines the pattern, and modest absolute numbers can still be firmly cholestatic. A bilirubin that is still normal, as here, tells you the flow is impaired but not blocked, which is a genuinely earlier stage.
What else on the report can hide this
The bilirubin is the number that decides urgency. Normal, as in this pattern, means partial or early impairment and allows an ordered investigation. Rising bilirubin with these two means obstruction, and that becomes a different and faster problem.
Antimitochondrial antibodies belong here and are frequently omitted. Primary biliary cholangitis presents exactly this way, predominantly in women in middle age, often with itching that precedes everything else by months, and it is treatable in a way that matters more the earlier it starts. Ask about itching without a rash, because people rarely volunteer it as a liver symptom.
Ultrasound answers the mechanical question: are the ducts dilated. Dilated ducts mean something is blocking them. Normal-caliber ducts with this pattern point at the small ducts inside the liver, which is where the autoimmune and drug causes live.
What usually causes it
Listed from most to least common — not from most to least serious.
- Very common
Gallstones in the bile duct
Often with episodes of right upper abdominal pain after eating. Stones can pass and the enzymes settle, which produces a fluctuating pattern that is easy to dismiss between episodes.
- Very common
Medications
Co-amoxiclav is the classic, sometimes starting weeks after the course finished. Also flucloxacillin, some antipsychotics, azathioprine and anabolic steroids. Timing against the drug identifies it, and recovery can take months.
- Common
Metabolic fat in the liver
Usually ALT-dominant, but it produces this pattern in a minority. The metabolic company it keeps, waist, HbA1c, triglycerides, is what supports it.
- Common
Primary biliary cholangitis
Predominantly women in middle age. Itching without a rash and fatigue often precede everything else, and antimitochondrial antibodies confirm it. Treatable, and earlier treatment works better.
- Uncommon
Primary sclerosing cholangitis
Strongly associated with inflammatory bowel disease, particularly ulcerative colitis. MRCP shows the characteristic duct changes.
- Uncommon
An infiltrative process in the liver
Sarcoidosis, tuberculosis, amyloid, lymphoma or metastases. The liver may be enlarged, and imaging is what finds it.
- Uncommon
A tumor obstructing the ducts
Pancreatic head or bile duct cancer. Painless jaundice with weight loss is the presentation that must not be watched, though at this stage the bilirubin is still normal.
- Rare
Right heart failure with a congested liver
Breathlessness, ankle swelling and a known cardiac problem. The liver is downstream of the real issue.
What is usually checked next
- Ultrasound of the liver and bile ducts Distinguishes blocked large ducts from disease of the small ducts inside the liver, which splits the differential.
- Antimitochondrial antibodies Diagnoses primary biliary cholangitis, which fits this pattern precisely and is frequently not tested for.
- A full medication history including anything stopped in the past three months Drug-induced cholestasis can begin after the course has finished, so a current medicine list is not enough.
- MRCP Images the ducts in detail when ultrasound is unrevealing and the pattern persists.
- Repeat the panel in four to six weeks Distinguishes a passing drug effect or a stone that has moved from something established.
When to seek care sooner
- Emergency Fever with pain under the right ribs, with or without yellowing of the eyes
- Emergency Confusion or drowsiness with jaundice
- Same day Yellowing of the eyes or skin, pale stools, or dark urine
- Same day Painless yellowing with unintentional weight loss
- Same day A rising bilirubin on a repeat panel
- Soon Itching severe enough to disturb sleep
Questions worth bringing to your appointment
- Has an ultrasound of the bile ducts been arranged?
- Have antimitochondrial antibodies been checked?
- Could a medicine I took in the past few months explain this, even one I have stopped?
- I have itching without a rash. Is that relevant here?
- What would make you want an MRCP rather than repeating the ultrasound?