Thymol Turbidity Test Interpreter
Interpret a thymol turbidity result against the normal range. The thymol turbidity test is a historical liver-function (colloidal-lability) test that estimated serum gamma-globulins and hepatic inflammation from how cloudy serum becomes when mixed with a thymol reagent. Enter the value in units to see whether it is normal or raised. It is a legacy test — largely replaced by modern liver enzymes and protein electrophoresis — kept here for reference.
About the thymol turbidity test
A colloidal-lability test of liver function based on the turbidity produced when serum reacts with thymol, correlating with serum gamma-globulins. Source: Maclagan NF, “The thymol turbidity test as an indicator of liver dysfunction,” British Journal of Experimental Pathology 1944.
Frequently asked questions
What is the thymol turbidity test?
The thymol turbidity test is an old “colloidal lability” liver-function test in which serum is mixed with a saturated thymol reagent; a cloudy (turbid) reaction indicates raised gamma-globulins and is graded in units (Maclagan or Shank-Hoagland units). It was used to detect and follow liver inflammation before specific enzyme assays and protein electrophoresis became routine. The reaction depends on the balance of gamma-globulins against albumin and lipoproteins in the serum rather than on any single enzyme, which is why it was classed as a test of colloidal lability rather than of liver function directly.
What is a normal thymol turbidity value?
A value under about 5 units is generally considered normal, with results of roughly 5 or more taken as raised. Different laboratories and methods used slightly different cut-offs, so the figure on your own report is what matters. This tool uses under 5 units as the normal threshold.
What does a raised result mean?
A raised thymol turbidity reflects increased serum gamma-globulins and points towards hepatocellular inflammation — historically it was used to suggest conditions such as viral or autoimmune hepatitis and cirrhosis. It is non-specific, however, and can also rise in some non-liver conditions with high globulins. Because the reading reports globulins rather than hepatocyte injury, a raised value never localised the problem by itself and was always read against the clinical picture and the rest of the liver panel. If you are interpreting an old record, check the units and the issuing laboratory’s own reference range before comparing the value with the under-5-unit threshold used here.
Is this test still used?
Thymol turbidity is now rarely used. In most of the world the thymol turbidity test has been superseded by direct liver enzymes (ALT, AST, ALP, GGT), bilirubin, albumin and serum protein electrophoresis, which are more specific and reproducible. It may still appear in some regions, older records or teaching, which is why an interpreter is useful. This calculator is an educational reference, not medical advice.
What modern tests replace it?
For assessing the liver today, clinicians use the liver enzyme panel and synthetic-function markers, and quantify gamma-globulins directly with serum protein electrophoresis. See our other liver tools — the MELD, MELD 3.0, Child-Pugh, FIB-4 and APRI calculators — for current approaches to liver-disease severity and fibrosis. Serum protein electrophoresis is the closest direct descendant, since it quantifies the gamma-globulins that thymol turbidity only detected indirectly. No single modern test is a like-for-like replacement, because the thymol reaction conflated globulin excess, albumin loss and lipoprotein changes into one number that today would be reported by three separate assays.
This is a reference tool, not a diagnosis or medical advice. Results depend on the laboratory, assay and clinical context, and reference intervals vary between labs and by age and sex — always read your result against the range printed on your own report and discuss it with a qualified healthcare professional.
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