Tumor Markers
Normal range < 37 U/mL (< 37 kU/L SI). Specimen: Serum.
Also known as: cancer antigen 19-9.
This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.
| Specimen | Serum |
|---|---|
| Conventional range | < 37 U/mL |
| SI range | < 37 kU/L |
| Conversion factor | ×1 (conventional → SI) |
| Panel | Tumor Markers |
Convert any CA 19-9 result between units on the unit converter.
The standard teaching reference range for CA 19-9 is < 37 U/mL in conventional units, or < 37 kU/L in SI units. This value is measured in serum.
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.
Above the range
At the bedside
Study aid
Same panel