| 8629-8 | None | Q wave depth |
| 8630-6 | None | Q wave depth.lead |
| 9925-9 | None | Q wave depth.lead AVF |
| 9926-7 | None | Q wave depth.lead AVL |
| 9927-5 | None | Q wave depth.lead AVR |
| 9928-3 | None | Q wave depth.lead I |
| 9929-1 | None | Q wave depth.lead II |
| 9930-9 | None | Q wave depth.lead III |
| 9931-7 | None | Q wave depth.lead V1 |
| 9932-5 | None | Q wave depth.lead V2 |
| 9933-3 | None | Q wave depth.lead V3 |
| 9934-1 | None | Q wave depth.lead V4 |
| 9935-8 | None | Q wave depth.lead V5 |
| 9936-6 | None | Q wave depth.lead V6 |
| 8631-4 | None | Q wave duration |
| 9937-4 | None | Q wave duration.lead AVF |
| 9938-2 | None | Q wave duration.lead AVL |
| 9939-0 | None | Q wave duration.lead AVR |
| 9940-8 | None | Q wave duration.lead I |
| 9941-6 | None | Q wave duration.lead II |
| 9942-4 | None | Q wave duration.lead III |
| 9943-2 | None | Q wave duration.lead V1 |
| 9944-0 | None | Q wave duration.lead V2 |
| 9945-7 | None | Q wave duration.lead V3 |
| 9946-5 | None | Q wave duration.lead V4 |
| 9947-3 | None | Q wave duration.lead V5 |
| 9948-1 | None | Q wave duration.lead V6 |
| 20295-2 | None | Q-wave to closure |
| 20296-0 | None | Q-wave to open |
| 8632-2 | None | QRS axis |
| 18517-3 | None | QRS axis.frontal plane |
| 18507-4 | None | QRS axis.horizontal plane |
| 8617-3 | None | QRS complex |
| 8897-1 | None | QRS complex |
| 9873-1 | None | QRS complex |
| 44973-6 | None | QRS duration |
| 8633-0 | None | QRS duration |
| 9949-9 | None | QRS duration.lead AVF |
| 9950-7 | None | QRS duration.lead AVL |
| 9951-5 | None | QRS duration.lead AVR |
| 9952-3 | None | QRS duration.lead I |
| 9953-1 | None | QRS duration.lead II |
| 9954-9 | None | QRS duration.lead III |
| 9955-6 | None | QRS duration.lead V1 |
| 9956-4 | None | QRS duration.lead V2 |
| 9957-2 | None | QRS duration.lead V3 |
| 9958-0 | None | QRS duration.lead V4 |
| 9959-8 | None | QRS duration.lead V5 |
| 9960-6 | None | QRS duration.lead V6 |
| 9961-4 | None | QRS initial amplitude.lead AVF |
| 9962-2 | None | QRS initial amplitude.lead AVL |
| 9963-0 | None | QRS initial amplitude.lead AVR |
| 9964-8 | None | QRS initial amplitude.lead I |
| 9965-5 | None | QRS initial amplitude.lead II |
| 9966-3 | None | QRS initial amplitude.lead III |
| 9967-1 | None | QRS initial amplitude.lead V1 |
| 9968-9 | None | QRS initial amplitude.lead V2 |
| 9969-7 | None | QRS initial amplitude.lead V3 |
| 9970-5 | None | QRS initial amplitude.lead V4 |
| 9971-3 | None | QRS initial amplitude.lead V5 |
| 9972-1 | None | QRS initial amplitude.lead V6 |
| 18514-0 | None | QRS offset |
| 18513-2 | None | QRS onset |
| 9973-9 | None | QRS terminal amplitude.lead AVF |
| 9974-7 | None | QRS terminal amplitude.lead AVL |
| 9975-4 | None | QRS terminal amplitude.lead AVR |
| 9976-2 | None | QRS terminal amplitude.lead I |
| 9977-0 | None | QRS terminal amplitude.lead II |
| 9978-8 | None | QRS terminal amplitude.lead III |
| 9979-6 | None | QRS terminal amplitude.lead V1 |
| 9980-4 | None | QRS terminal amplitude.lead V2 |
| 9981-2 | None | QRS terminal amplitude.lead V3 |
| 9982-0 | None | QRS terminal amplitude.lead V4 |
| 9983-8 | None | QRS terminal amplitude.lead V5 |
| 9984-6 | None | QRS terminal amplitude.lead V6 |
| 18532-2 | None | QT interval |
| 18533-0 | None | QT interval |
| 18534-8 | None | QT interval |
| 18535-5 | None | QT interval |
| 18536-3 | None | QT interval |
| 18537-1 | None | QT interval |
| 18538-9 | None | QT interval |
| 18539-7 | None | QT interval |
| 18540-5 | None | QT interval |
| 18541-3 | None | QT interval |
| 18542-1 | None | QT interval |
| 18543-9 | None | QT interval |
| 44975-1 | None | QT interval |
| 8634-8 | None | QT interval |
| 8636-3 | None | QTC interval |
| 42799-7 | None | Quadrant |
| 45661-6 | None | Quadriplegia |
| 48550-8 | None | Quality Audit Marker (QAM) panel |
| 35522-2 | None | Quality control and quality assurance section |
| 43163-5 | Quaternary ammonium compound [Mass/volume] in Unspecified specimen | Quaternary ammonium compound |
| 9391-4 | Quazepam [Mass/volume] in Serum or Plasma | Quazepam |
| 7532-5 | California Live Oak IgE Ab [Units/volume] in Serum | Quercus agrifolia Ab.IgE |
| 50369-8 | White Oak IgE Ab [Ratio] in Serum | Quercus alba Ab.IgE |
| 6189-5 | White Oak IgE Ab [Units/volume] in Serum | Quercus alba Ab.IgE |
| 6849-4 | None | Quercus alba Ab.IgE |
| 15875-8 | White Oak IgE Ab RAST class in Serum | Quercus alba Ab.IgE.RAST class |
| 15884-0 | None | Quercus alba Ab.IgE.RAST class |
| 7536-6 | White Oak IgG Ab [Units/volume] in Serum | Quercus alba Ab.IgG |
| 7537-4 | White Oak triggered histamine release [Units/volume] in Blood | Quercus alba basophil bound Ab |
| 48247-1 | White Oak triggered leukotriene release [Mass/volume] by Leukocytes | Quercus alba leukotriene release |
| 7530-9 | Gamble Oak IgE Ab [Units/volume] in Serum | Quercus gambelii Ab.IgE |
| 15878-2 | Gamble Oak IgE Ab RAST class in Serum | Quercus gambelii Ab.IgE.RAST class |
| 7529-1 | California Black Oak IgE Ab [Units/volume] in Serum | Quercus kelloggii Ab.IgE |
| 15876-6 | California Black Oak IgE Ab RAST class in Serum | Quercus kelloggii Ab.IgE.RAST class |
| 7535-8 | Valley Oak IgE Ab [Units/volume] in Serum | Quercus lobata Ab.IgE |
| 15882-4 | Valley Oak IgE Ab RAST class in Serum | Quercus lobata Ab.IgE.RAST class |
| 15877-4 | Coastal Oak IgE Ab RAST class in Serum | Quercus parvula Ab.IgE.RAST class |
| 7534-1 | Red Oak IgE Ab [Units/volume] in Serum | Quercus rubra Ab.IgE |
| 15881-6 | Red Oak IgE Ab RAST class in Serum | Quercus rubra Ab.IgE.RAST class |
| 7528-3 | Black Oak IgE Ab [Units/volume] in Serum | Quercus velutina Ab.IgE |
| 24157-0 | None | Quercus virginiana Ab.IgE |
| 6164-8 | Virginia Live Oak IgE Ab [Units/volume] in Serum | Quercus virginiana Ab.IgE |
| 15880-8 | Virginia Live Oak IgE Ab RAST class in Serum | Quercus virginiana Ab.IgE.RAST class |
| 15883-2 | None | Quercus virginiana Ab.IgE.RAST class |
| 7533-3 | Interior Live Oak IgE Ab [Units/volume] in Serum | Quercus wislizeni Ab.IgE |
| 26776-5 | Quetiapine [Mass/volume] in Serum or Plasma | Quetiapine |
| 17506-7 | Quinacrine [Mass/volume] in Serum or Plasma | Quinacrine |
| 12348-9 | Quinethazone [Presence] in Urine | Quinethazone |
| 12546-8 | Quinethazone [Presence] in Serum or Plasma | Quinethazone |
| 9392-2 | Quinethazone [Mass/volume] in Urine | Quinethazone |
| 14899-9 | Quinidine [Molecules/volume] in Serum or Plasma | Quinidine |
| 17507-5 | Quinidine [Mass/volume] in Urine | Quinidine |
| 29226-8 | Quinidine [Mass/volume] in Body fluid | Quinidine |
| 4014-7 | Quinidine [Mass/volume] in Blood | Quinidine |
| 4015-4 | Quinidine [Presence] in Urine | Quinidine |
| 43832-5 | Quinidine [Presence] in Unspecified specimen | Quinidine |
| 4419-8 | Quinidine [Mass] of Dose | Quinidine |
| 6694-4 | Quinidine [Mass/volume] in Serum or Plasma | Quinidine |
| 18393-9 | Quinidine+Quinine [Presence] in Urine | Quinidine+Quinine |
| 4016-2 | Quinidine+Quinine [Presence] in Serum or Plasma | Quinidine+Quinine |
| 9779-0 | Quinidine Free [Mass/volume] in Serum or Plasma | Quinidine.free |
| 21483-3 | Quinidine [Mass/volume] in Serum or Plasma --peak | Quinidine^peak |
| 4017-0 | Quinidine [Mass/volume] in Serum or Plasma --trough | Quinidine^trough |
| 17508-3 | Quinine [Units/volume] in Urine | Quinine |
| 27218-7 | Quinine [Mass/volume] in Urine | Quinine |
| 4018-8 | Quinine [Mass/volume] in Blood | Quinine |
| 4019-6 | Quinine [Mass/volume] in Serum or Plasma | Quinine |
| 4020-4 | Quinine [Presence] in Urine | Quinine |
| 43833-3 | Quinine [Presence] in Unspecified specimen | Quinine |
| 4420-6 | Quinine [Mass] of Dose | Quinine |
| 9810-3 | Quinine [Presence] in Gastric fluid | Quinine |
| 48121-8 | Quinolinate/Creatinine [Molecular ratio] in Urine | Quinolinate/Creatinine |
| 38724-1 | Quinoline [Mass/volume] in Air | Quinoline |
| 48296-8 | Quinoline yellow triggered leukotriene release [Mass/volume] by Leukocytes | Quinoline yellow leukotriene release |
| 23640-6 | Quinupristin+Dalfopristin [Susceptibility] | Quinupristin+Dalfopristin |
| 23641-4 | Quinupristin+Dalfopristin [Susceptibility] by Minimum inhibitory concentration (MIC) | Quinupristin+Dalfopristin |
| 33334-4 | Quinupristin+Dalfopristin [Susceptibility] by Gradient strip (E-test) | Quinupristin+Dalfopristin |
| 35835-8 | Quinupristin+Dalfopristin [Susceptibility] by Disk diffusion (KB) | Quinupristin+Dalfopristin |