BD FACS flow cytometry: making sense of the term

FACS is commonly used in names associated with analysing or sorting fluorescently labelled cells. In a clinical report, the term may describe the technology used rather than a diagnosis or a test that is fundamentally different from flow cytometry.

Cells from a suitable sample are labelled with antibodies and examined one at a time as they pass through the instrument. The resulting marker combinations help the laboratory distinguish cell groups and look for a population with an unusual immunophenotype.

The conclusion reflects more than a machine output. Laboratory specialists assess controls, sample quality, marker relationships, and the reason for testing. Results can contribute to classifying some leukaemias or lymphomas and to monitoring selected abnormal populations, but tissue structure and other tests may still be necessary.

Read the summary for a description of the identified cells and any limitations. A sample with too few living cells, degradation, or dilution may provide less information even when the analyser functioned correctly.

Bring the result to the ordering specialist and compare it with blood counts, microscope findings, biopsy pathology, and any genetic tests. Confirm whether the flow result settles the clinical question, narrows the possibilities, or calls for a fresh or different specimen.

The analyser never comes into contact with the patient. Concerns after testing therefore relate to the blood draw, biopsy, or other collection method. Call the relevant clinic if a collection site becomes increasingly painful, hot, swollen, red, or starts draining fluid.

Seek immediate care for uncontrolled bleeding, collapse, severe breathlessness, chest pain, or a sudden change in alertness. For a bone marrow procedure, keep the dressing and activity instructions supplied by the clinical team.

Consider asking whether an abnormal cell group was detected, how confidently it can be classified, and whether the sample had technical limitations. Ask what the result adds to the biopsy or blood findings and which remaining result will determine the next step.