Irritable Bowel Syndrome Diagnosis

How i read the diagnosis and how i came to think that i am sure i have IBS-c.

http://www.ibsgroup.org/diagnosis

it states:

The diagnostic criteria of Irritable Bowel Syndrome always presumes the absence of a structural or biochemical explanation for the symptoms and is made only by your health care professional. Using the Rome II definition, Irritable Bowel Syndrome can be diagnosed based on at least 12 weeks, which need not be consecutive, in the preceding 12 months of abdominal discomfort or pain that has two out of three features: 

1. Relieved with defecation; and/or
2. Onset associated with a change in frequency of stool; and/or
3. Onset associated with a change in form (appearance) of stool.

Symptoms that Cumulatively Support the Diagnosis of IBS:

• Abnormal stool frequency (may be defined as greater than 3 bowel movements per day and less than 3 bowel movements per week);
• Abnormal stool form (lumpy/hard or loose/watery stool);
• Abnormal stool passage (straining, urgency, or feeling of incomplete evacuation);
• Passage of mucus;
• Bloating or feeling of abdominal distension.

Supportive Symptoms of IBS:

1. Fewer than three bowel movements a week
2. More than three bowel movements a day
3. Hard or lumpy stools
4. Loose (mushy) or watery stools
5. Straining during a bowel movement
6. Urgency (having to rush to have a bowel movement)
7. Feeling of incomplete bowel movement
8. Passing mucus (white material) during a bowel movement
9. Abdominal fullness, bloating, or swelling

Diarrhea-predominant: 1 or more of 2, 4, 6 and none of 1, 3, or 5; or: 2 or more of 2, 4, or 6 and one of 1 or 5. (3. Hard or lumpy stools do not qualify.)
Constipation-predominant: 1 or more of 1, 3, 5 and none of 2, 4, or 6;or: 2 or more of 1, 3, or 5 and one of 2, 4 or 6.