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MIT-LCP
Capitalization of Units of Measure
This not earthshaking but I notice that examining the uses of units of measure in MIMIC-IV, there is considerable inconsistency in how these are capitalized. For example, in chartevents, milliliters are represented as "mL", but milliliters per minute are "ml/min". By contrast, in labevents, milliliters per minute are "mL/min". Below is the comprehensive list of units of measure used in chartevents and labevents in MIMIC-IV v2.2.
MariaDB [mimic4v22]> select binary valueuom, count(*) n from labevents group by binary valueuom order by valueuom;
| binary valueuom | n |
|---|---|
| NULL | 17991766 |
| #/hpf | 1513831 |
| #/lpf | 122293 |
| #/uL | 292835 |
| % | 16868943 |
| +/- | 63684 |
| /hpf | 306103 |
| /mm3 | 3 |
| BU | 1 |
| EU/dL | 8919 |
| fL | 4532801 |
| g/dL | 5729746 |
| GPL | 2506 |
| hrs | 625 |
| IU/L | 4943774 |
| IU/mL | 25520 |
| K/uL | 9029635 |
| L/min | 9320 |
| log10 cop/mL | 1564 |
| log10 copies/mL | 2232 |
| log10 IU/mL | 14085 |
| m/uL | 3190494 |
| mEq/L | 16935016 |
| mg/24hr | 14607 |
| mg/dL | 22812951 |
| mg/g | 54967 |
| mg/L | 156300 |
| mg/mg | 46472 |
| min | 66 |
| mIU/mL | 49561 |
| mL | 11192 |
| mL/min | 625 |
| mm Hg | 1036214 |
| mm/hr | 60481 |
| mmol/L | 796306 |
| mOsm/kg | 90755 |
| MPL | 2506 |
| N/A | 1606801 |
| ng/dL | 138087 |
| ng/mL | 1157605 |
| ng/mL DDU | 39 |
| ng/mL FEU | 9592 |
| nmol/L | 7036 |
| pg | 3167073 |
| pg/mL | 232519 |
| Pos/Neg | 545 |
| Ratio | 316483 |
| Score | 48 |
| sec | 2662566 |
| U | 2106 |
| U/g/Hb | 2557 |
| U/L | 273 |
| U/mL | 32919 |
| ug/dL | 278831 |
| ug/mL | 236261 |
| uIU/mL | 316306 |
| umol/L | 14807 |
| units | 1270125 |
| uU/ML | 89 |
MariaDB [mimic4v22]> select binary valueuom, count(*) n from chartevents group by binary valueuom order by valueuom;
| binary valueuom | n |
|---|---|
| NULL | 236702276 |
| #/uL | 696 |
| % | 9312983 |
| /min | 6579 |
| bpm | 7827348 |
| cm | 968376 |
| cmH2O | 3351546 |
| cmH2O/L/seconds | 173637 |
| Degree | 77 |
| dynes*sec/cm5 | 2647 |
| dynes*sec/cm5/m2 | 3087 |
| dynes.sec.cm-5/m2 | 3620 |
| g/dL | 58054 |
| g/dl | 428841 |
| g/kg | 450 |
| hour | 1717 |
| Inch | 33707 |
| insp/min | 9642142 |
| IU/L | 473024 |
| K/uL | 877493 |
| kcal/day | 1 |
| kcal/kg | 477 |
| kg | 277540 |
| L/min | 2819673 |
| L/min/m2 | 15070 |
| lbs | 1462 |
| Liters | 1606 |
| mA | 138292 |
| mEq/L | 3064966 |
| mg/dL | 2781756 |
| mg/L | 2747 |
| min | 44066 |
| mL | 2662414 |
| mL/beat | 20836 |
| ml/hr | 993580 |
| ml/kg | 2376 |
| mL/m2 | 6380 |
| ml/min | 242012 |
| mm/hr | 916 |
| mmHg | 25401973 |
| mmHg. | 19059 |
| mmol/L | 448477 |
| mOsm/kg | 22412 |
| msec | 415 |
| mV | 98445 |
| ng/mL | 111153 |
| pg/mL | 3808 |
| ppm | 1290 |
| psi | 927 |
| RPM | 15444 |
| sec | 1524360 |
| ug/dL | 5698 |
| ug/mL | 44789 |
| umol/L | 1615 |
| units | 525828 |
| years | 26 |
| °C | 958887 |
| °F | 1515987 |
