How to Read Health Trends Over Time

Looking at individual readings is like reading single words instead of sentences. Here's how to read the full story.

Calculating Weekly Averages

Instead of looking at each reading:

• Add all readings for the week
• Divide by number of readings
• Compare this week's average to last week's

Example: Blood sugar readings of 128, 142, 135, 138, 140, 131, 144 = Average of 137

Identifying Direction

Upward Trend

• Weekly average is higher than last week
• AND higher than two weeks ago
• Needs attention

Downward Trend

• Weekly average is lower than last week
• Usually positive (unless too low)

Stable

• Weekly average within 5-10% of previous weeks
• Usually the goal for chronic conditions

Reading Time-of-Day Patterns

Compare similar readings:

• All fasting readings together
• All post-dinner readings together
• Morning BP vs evening BP

Don't compare: Morning fasting to post-meal readings

Spotting Correlations

Look for patterns like:

• Higher after certain foods
• Better on exercise days
• Worse during high-stress periods
• Weekly rhythms (weekday vs weekend)

Using Charts Effectively

Line Charts

Best for seeing trends over time

Bar Charts

Best for comparing averages (this week vs last week)

Tables

Best for finding specific values

Your doctor wants to see trends, not random readings. Learn to speak their language.