What this test measures
SGPT (Serum Glutamic-Pyruvic Transaminase), now usually called ALT (Alanine Transaminase), is an enzyme produced mainly in liver cells. When liver cells are injured the enzyme leaks into blood and the serum level rises. Because SGPT is concentrated in the liver more than in other tissues, it is the most liver-specific of the routine enzymes.
Why it matters
SGPT is the most sensitive routine marker of liver injury and is included in every Liver Function Test panel. A rising SGPT signals hepatocellular injury — fatty liver / NAFLD, alcohol, hepatitis B / C, drug-induced liver injury, autoimmune hepatitis, and metabolic conditions. Most patients with chronic liver disease are first picked up by a routine SGPT check, often without symptoms. Annual SGPT screening is reasonable for adults with diabetes, obesity, hypertension, alcohol use, hepatitis exposure, or on long-term hepatotoxic drugs.
How to prepare
Fasting is preferred (8–10 hours) if SGPT is part of a Lipid Profile or fasting glucose panel; otherwise not required. Avoid alcohol for 24 hours before — a single drink can transiently raise SGPT. Mention all medications (especially statins, anti-TB drugs, methotrexate, paracetamol, herbal supplements) — many affect liver enzymes.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| SGPT (ALT) (U/L)[1][2] | Men < 41 · Women < 33 | Low SGPT is not clinically meaningful. | Mild rise (1–3× upper limit) — most often fatty liver, alcohol, viral hepatitis carrier state, drug effect, or muscle source (recent vigorous exercise, rhabdomyolysis). Moderate rise (3–10×) — viral hepatitis flare, drug-induced liver injury, autoimmune hepatitis. Marked rise (>10×) — acute hepatitis (viral / drug / paracetamol overdose), ischaemic hepatitis — needs prompt evaluation. |
How to interpret a raised SGPT
| SGPT level | Fold above upper limit | Common causes |
|---|---|---|
| 41 – 120 U/L | 1 – 3× | Fatty liver / NAFLD, alcohol, mild drug effect, recent vigorous exercise |
| 120 – 400 U/L | 3 – 10× | Chronic viral hepatitis flare, drug-induced liver injury, autoimmune hepatitis |
| 400 – 1500 U/L | 10 – 35× | Acute viral hepatitis (A, B, E), drug-induced acute liver injury, alcoholic hepatitis |
| > 1500 U/L | > 35× | Acute hepatitis with severe injury, paracetamol toxicity, ischaemic hepatitis, fulminant hepatitis — urgent care |
Frequently asked questions
Do I need to fast for SGPT?
Not strictly. Fasting is preferred if SGPT is part of a bundled fasting panel. Avoid alcohol for 24 hours before regardless.
My SGPT is 60 — should I worry?
A mildly raised SGPT (up to ~3× the upper limit) is very common and is most often fatty liver, recent alcohol, a new medication, or muscle source. A single mildly raised value should be repeated in 4–6 weeks; if it stays raised, the workup includes ultrasound, hepatitis B / C serology, and a closer look at diet, alcohol and medications.
What is the difference between SGPT and SGOT?
SGPT (ALT) is mostly in the liver — more specific for liver injury. SGOT (AST) is in liver, heart muscle, skeletal muscle and red blood cells — less specific. The ratio between them helps point to a cause: AST/ALT > 2 suggests alcoholic liver disease; AST/ALT < 1 suggests fatty liver or chronic hepatitis.
Can exercise raise SGPT?
Yes — vigorous exercise, especially weight training, can transiently raise both SGPT and SGOT by liberating enzymes from skeletal muscle. Avoid heavy exercise in the 24 hours before testing.
Will paracetamol affect my SGPT?
Therapeutic doses (≤3 g/day in healthy adults) usually do not affect SGPT. Overdose or chronic high-dose use is the single most common cause of severe drug-induced liver injury — paracetamol overdose can push SGPT into the thousands.
How often should I test SGPT?
Annually for adults with diabetes, obesity, hypertension, family history of liver disease, regular alcohol use, or hepatitis B / C. More often (every 3–6 months) if on a hepatotoxic drug or during treatment of liver disease.
Should I do SGPT alone or a full LFT?
A full Liver Function Test gives more information for the same blood draw — SGPT plus SGOT, ALP, GGT, bilirubin (total + direct), albumin, globulin, total protein. Standalone SGPT is enough for follow-up surveillance once a baseline LFT is normal.
Related Liver / Enzymes tests
Tests commonly ordered alongside ALANINE TRANSAMINASE (SGPT), or that help interpret an unexpected result.
Sources & references
- AASLD Practice Guidance — Abnormal Liver Chemistries (2017) · accessed 2026-05-29T00:00:00.000Z
- NIH MedlinePlus — ALT Blood Test · accessed 2026-05-29T00:00:00.000Z
- NCBI StatPearls — Alanine Aminotransferase · accessed 2026-05-29T00:00:00.000Z
Book with Zelnoo
Get your ALANINE TRANSAMINASE (SGPT) test done at home — transparent prices, NABL-accredited labs.
Zelnoo lets you compare diagnostic test prices across NABL-accredited labs in Mumbai & Thane, book a free home phlebotomist visit, and receive digital reports in 24–48 hours into a consent-first report vault. No subscriptions, no membership fees — pay only for the test you book.
Book ALANINE TRANSAMINASE (SGPT) now