Unit "Volume per pressure" missing?

[dlaxar (Daniel Laxar)]

Hello,

could anyone point me into the direction of a unit that represents “volume per pressure” (as can be found in lung compliance, for example).

I’ve found nothing in Athena and this forum, unfortunately. Is there such a thing as a “volume per pressure” unit (ml/mbar, ml/cmH2O, ml/bar, L/bar, …)?

Thank you so much,
Daniel

[Mikita_Salavei]

@dlaxar, unfortunately we also can’t find such units in current version of vocabularies in Athena. Please, clarify, which specific volume per pressure units do you need, and we add this concepts in UCUM Vocabulary.

[dlaxar (Daniel Laxar)]

Thank you for getting back to me so quickly.

The most common ones I can think of are:

• ml/cmH2O (although I’d suggest to at use ISO-Units and go with ml/mbar and L/bar) for lung compliance
• mbar/L for the reciprocal lung elastance (pressure per volume)

On the other side, mbar is not a standard unit as of now. If we used ISO Units I’d suggest also adding the appropriate component units, i.e. adding mbar.

If there is anything I can do to help, please let me know.

Best
Daniel

[zhuk (Oleg Zhuk)]

Hello, @dlaxar

Well, in a rush of vocabulary refreshes, we haven’t tagged you here!

ml/mbar
mbar/L

These units have been here for a while

If you still need something else, write here:

Units of Measure to Add

Hello, While mapping units of measure to their standards, I have found a short list that appear to be in the UCUM but do not have a standard mapping in the OMOP Vocabulary. Is it possible to have these added? Or if there is a way to map these that I am not understanding please advise. Thank you! {copies} – Copies U/dL – Enzyme unit per deciliter U/mL – Enzyme unit per milliliter mL/(kg.min) – Milliliter per kilogram per minute nmol/h/mg{protein} – Nanomole per hour per milligram of protein …

[dlaxar (Daniel Laxar)]

Hi @zhuk,

thanks for getting back to me. We’ve already implemented these new units into our ETL.

Best
Daniel