How do i store area into a list?

Here are my following questions:

1) How do i store area into a list then call for the max (function5)

2) How can i tidy up my code as i have some repeative

Currently I have issue with function 5. I want to store the area into a list. later part will call for the max area and compare with a value, if it exceed the range, alarm will be trigerred.

%% FUNCTION 5: AREA OF BLACK BLOBS (INDIVIDUAL)
    if max(blobArea) > 3000
        [a,fs]= audioread('Test/WarningAlarm.mp3');
        sound(a(1:300000,1),fs);
        numNGcases = numNGcases + 1;
        fprintf('FUNCTION 5 Error\n');
    else
        numOKcases = numOKcases + 1;
    end

Answer 1

[Image Analyst]

 %% FUNCTION 5: AREA OF BLACK BLOBS (INDIVIDUAL)
allBlobAreas = [blobMeasurements.Area] % Put all blob areas into one list (vector).
    if max(allBlobAreas) > 3000

etc.

[Shu Yi Ho]

Thank you