Skip to content
View in the app

A better way to browse. Learn more.
allnurses

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.
Discussion

effective osmolality question

effective osmolality = 2 x [Na-]p + [glucose]/18

the glucose portion of this equation is explained

as follows (in my textbook):

"glucose concentration is divided by one tenth of its molecular weight to calculate the number of osmotically active particles per liter."

why does the equation use 18?

(it also explains that including the BUN is a more accurate estimate of the actual osmolality, but the measure of the efective plasma osmolaity without consideration of the BUN term is the more physiologically meaningful estimate - what does this really mean?)

Featured Replies

The equation uses 18 because as your definition says, the glucose concentration is divided by 1/10 of its molecular weight...which happens to be 18.

Glucose has a molecular wt. of 180.16 G Mol

1/10 of about 180 is 18.

Guest
This topic is now closed to further replies.
Go to topic listing

Currently Reading 0

  • No registered users viewing this page.

Account

Navigation

Search

Search

Configure browser push notifications
Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.