| Antiglobulin test , Direct |
| AMA |
| ANCA |
| Antiglobulin test , Indirect |
| Aspartate Aminotransferase (AST- SGOT- GOT) |
| Anti Streptolysin o |
| Anti Thrombin |
| Acid Phosphatase serum |
| Activated Partial Thromboplastin Time |
| Anti GBM(Glomerular Basement Membrane) |
| Alanine AminoTransferase (ALT – SGPT-GPT) |
| Aldosterone Urine |
| Alkaline phosphatase |
| Anti ds DNA Ab |
| Anti Cardiolipin Ab |
| Aldosterone |
| Alpha Fetoprotein |
| Albumin serum |
| Aldolase |
| Alpha 1 anti Trypsin |
| Amylase |
| Androstenedione |
| Anticyclic Citrulline peptide antibody |
| Acetylcholine Receptor Antibody |
| ACTH |