Re: Ratio or Mean

From: Maciej Simm (simmmmer@yahoo.com)
Date: Tue Mar 27 2001 - 08:27:40 EST


Dear Tomas,

there goes my neck:

I've ran a similar kit from OrpeGen Pharma. I have processed maybe
1-2000 samples in the last several months for neutrophil and monocyte
oxidative burst.

we use both the percent shift and geometric mean change. for example:

monocytes control =1%, high control=98%, we use 97%.

neutrophil GM control = 120, monocyte GM high control = 3500
, we use the difference.

Although not contained within the instructions, we manually
compensate the green rhodamine signal vs. the PI signal (yes,  they
overlap, and yes, the data looks different without compensation).

Also if you're using GM, you should make sure your starting GM is in
the same neighborhood for each new sample... voltage may need to be
changed.

There are patients who come in febrile, septic or otherwise insulted
and they may get an extra "peak" in the unstimulated control, which
is normal, but has to be accounted for in the analysis - this may
increase the % substraction in your %-age calculations.

regards,

Maciej

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