PTT (Activated Thromboplastin Time) Pyrlinks D (Deoxypyrinoline Dpd) R.A. Rheumatoid Arthritis test RBC Cholinesterase True (Erythrocytic, RBC Cholinesterase) RBC Red Blood Cells RBC Red Blood Cells RDW Red Cells Distribution Width Reducing Substances Renin Activity Reticulin antibody Reticulocytes Rh antibodies (Coombs Direct Test) Rhesus Factor Rickettsia (IFA) RPR Syphilis test (Rapid Plasma Reagin) Rubella Avidity Test Rubella virus Rubeola (Measles) IgG (IFA) S-100 Protein Salmonella Scrapings Selenium Serotonin SGOT (AST) Aspartate Aminotransferase SGPT (ALT) Alanine amoinotransferase 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
