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Tumor Markers

CA 15-3

Normal range < 30 U/mL (< 30 kU/L SI). Specimen: Serum.

Also known as: cancer antigen 15-3.

< 30 U/mLReference range

Reference range

This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.

SpecimenSerum
Conventional range< 30 U/mL
SI range< 30 kU/L
Conversion factor×1 (conventional → SI)
PanelTumor Markers

Convert any CA 15-3 result between units on the unit converter.

What is the normal range for CA 15-3?

The standard teaching reference range for CA 15-3 is < 30 U/mL in conventional units, or < 30 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

Common causes of a high CA 15-3

  • Metastatic breast cancer (monitoring)
  • Benign breast or liver disease

At the bedside

Nursing considerations

  • Monitors advanced breast cancer response and recurrence.

Study aid

Your notes on CA 15-3

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