A simple ratio of GGT and platelets that helps flag possible liver scarring risk.
The GGT-to-platelet ratio (GPR) is a calculated value, not a separate blood test. It is GGT divided by its upper limit of normal, divided by the platelet count (in 10^9/L), then multiplied by 100. It is a non-invasive estimate of liver scarring, developed mainly for chronic hepatitis B.
GPR was designed to help screen for significant fibrosis and cirrhosis without a biopsy. A low value makes meaningful scarring less likely, while a high value makes it more likely. Like APRI, it is a screening aid that works best at the extremes and should be combined with other markers and imaging.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
These are interpretive cut-offs from research, not lab ranges, and performance varies by population. GPR is less standardised than APRI.
| GPR value | Interpretation |
|---|---|
| Below ~0.32 | Significant fibrosis less likely |
| Above ~0.32 | Significant fibrosis more likely |
| Above ~1.0 | Suggestive of cirrhosis |
Source: Lemoine M et al., GPR predicts fibrosis in chronic HBV.
GGT rises with alcohol and some medicines, and platelets can fall for non-liver reasons, both of which distort GPR. The GGT upper limit of normal used in the formula varies by laboratory, which shifts the score. GPR is best validated in hepatitis B populations.
Best read with its components, GGT and platelet count, and alongside APRI, FIB-4, and liver imaging where indicated.
What does a high GPR mean? It suggests more liver stress or a higher chance of scarring. Your clinician may confirm with imaging, elastography, or other blood tests.
Do I need to fast for this test? No. Fasting is not required for GPR, though avoiding alcohol before testing can help reduce short-term spikes in GGT.
What can affect my result? Alcohol, certain medicines, acute infections, dehydration, and heavy exercise can shift GGT or platelets. Always share current medicines and supplements.
How often should I test GPR? It depends on your risk and care plan. People with chronic liver risks may recheck periodically to track trends; ask your clinician.
How long do results take? Results are usually ready in about 7 days.
What should I discuss with my clinician? Talk about alcohol use, medicines, viral hepatitis status, prior imaging, and any symptoms. Ask whether additional tests are needed for a clearer picture.
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