| RTF | resistance transfer factor; respiratory tract fluid |
|---|---|
| SACSF | subarachnoid cerebrospinal fluid |
| SFA | saturated fatty acid; seminal fluid assay; serum folic acid; stimulated fibrinolytic activity; super... |
| SFC | soluble fibrin complex; soluble fibrin-fibrinogen complex; spinal fluid count |
| SFL | synovial fluid lymphocyte |