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#1
05-29-2011
 USMLE Forums Addict Steps History: 1+CK+CS Posts: 127 Threads: 77 Thanked 77 Times in 26 Posts Reputation: 89
How to calculate SAAG

Hi,
I wasn't too sure on how to calculate SAAG (serum ascitic albumin gradient) for spontaneous bacterial peritonitis. So if we have the following values:
albumin (ascitic fluid): 2.0 g/dL
serum albumin: 2.8 g/dL

so do we do albumin (ascitic fluid): 2.0 g/dL / serum albumin: 2.8 g/dL = 0.7

or

serum albumin: 2.8 g/dL/ albumin (ascitic fluid): 2.0 g/dL= 1.4

Thank you!

#2
05-30-2011
 USMLE Forums Addict Steps History: Step 1 Only Posts: 114 Threads: 5 Thanked 60 Times in 42 Posts Reputation: 70

SAAG = (albumin concentration of serum) MINUS (albumin concentration of ascitic fluid).

It's minus, not divide by.

It's the difference, it's the gradient.
 The above post was thanked by: tima (05-30-2011)
#3
05-30-2011
 USMLE Forums Scout Steps History: 1 + CS Posts: 10 Threads: 4 Thanked 3 Times in 2 Posts Reputation: 13

S.albumin - A.albumin= SAAG
2.8-2.0=0.8
 The above post was thanked by: insomnic (05-31-2011), tima (05-30-2011)

 Tags Gastroenterology-, Internal-Medicine-

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